WARNING: THIS LIST IS NOT GUARANTEED TO BE ACCURATE NOR UP TO DATE. THIS IS NOT SUPPORTED BY OR ENDORSED BY TEXTRON LYCOMING. DO NOT USE ANY OF THIS INFORMATION FOR THE OPERATION OR MAINTENANCE OF ANY AIRCRAFT ENGINE. THIS INFORMATION IS PRESENTED FOR EDUCATIONAL PURPOSES ONLY

 

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Nomenclature


Lycoming's specific convention for post-WWII aircraft piston engine designation is as follows. Note that this convention is fairly standard and applicable to many other manufacturers.

General Format:
C-D-M


Where:
          C        Letters indicating the engine's configuration:

                I        Fuel injected
                O        Opposed type (pancake-style)
                X        X-type engine
                R        Radial type engine
                G        Engine is geared
                T        Engine is turbocharged
                S        Engine is supercharged
                L        Engine is left-turning
                A        Engine is designed for aerobatics (DRY SUMP)
                AE       Engine is designed for aerobatics (WET SUMP)
                M        Engine is designed for unmanned drone (UNCERTIFIED)
                H        Engine is designed for helicopter installation
                V        Engine is designed to have the crankshaft in the
                         vertical, not horizontal, plane.  Usually implies
                         "H"

          D        The engine's displacement in cubic inches.

          M        Configuration.  Includes power rating, nose section,
                   accessory section, counterweight application, and
                   magneto application.


Example from the Lycoming Overhaul manual:

                TIO-541-E1B4D

Where:
                TIO - The prefix as described above.

                541 - The engine's cubic inch displacement, as described
                      above.  A 1 at the end indicates an integral
                      accessory drive (e.g. TIO-541) except for the
                      76 series engines (see below).

                E - Power section and power rating for the displacement
                1 - Nose section (provisions for a prop governor,
                                  hollow/solid crankshaft, prop governor
                                  location)
                B - Accessory section (fuel pump type, accy pad(s), etc.)
                4 - Counterweight application (if applicable, see the power
                                                section to determine this)
                D - Dual magneto (if applicable)

PISTON - (4) FOUR CYLINDER SERIES


ModelHPT/O
RPM		FuelC.R.DESCRIPTIONSuffix
O-235-C11152800806.75:1Basic engine-15
O-235-C1B1152800806.75:1Same as -C1 with Retard Breaker Magnetos -15
O-235-C1C1152800806.75:1Same as -C1 but with Slick Magnetos -15
O-235-C2A1152800806.75:1Same as -C1 but has AS-127, Type 1 propeller flange -15
O-235-C2B1152800806.75:1Same as -C2A with -1200 series Magnetos -15
O-235-C2C1152800806.75:1Similar to -C2A but with Slick Magnetos -15
O-235-E11152800806.75:1Same as -C1 but has provision for controllable prop. -15
O-235-E1B1152800806.75:1Same as -C1B but has provision for controllable prop. -15
O-235-E2A1152800806.75:1Same as -C2A but has provision for controllable prop. -15
O-235-E2B1152800806.75:1Same as -C2B but has provision for controllable prop. -15
O-235-F11252800100/100LL9.70:1Similar to -C1 but higher power and comp. ratio -15
O-235-F1B1252800100/100LL9.70:1Similar to -C1B but higher power and comp. ratio -15
O-235-F2A1252800100/100LL9.70:1Similar to -C2A but higher power and comp. ratio -15
O-235-F2B1252800100/100LL9.70:1Similar to -C2B but higher power and comp. ratio -15
O-235-G11252800100/100LL9.70:1Same as -F1 but with provision for controllable prop. -15
O-235-G1B1252800100/100LL9.70:1Same as -F1I but with provision for controllable prop. -15
O-235-G2A1252800100/100LL9.70:1Same as -F2A but with provision for controllable prop. -15
O-235-G2B1252800100/100LL9.70:1Same as -F2B but with provision for controllable prop. -15
O-235-H2C1152800806.75:1Same as -C2C but with Type 1 dynafocal mounts -15
O-235-J2A1252800100/100LL9.70:1Same as -F2A but with Type 1 dynafocal mounts -15
O-235-J2B1252800100/100LL9.70:1Same as -F2B but with Hope 1 dynafocal mounts -15
O-235-K2A1182800100/100LL8.50:1Same as -F2A but with 20_ BTC timing, lower comp. ratio and lower power-15
O-235-K2B1182800100/100LL8.50:1Same as -F2B but with 20_ BTC timing, lower comp. ratio and lower power -15
O-235-K2C1182800100/100LL8.50:1Same as -K2A but with Slick Magnetos -15
O-235-L2A1182800100/100LL8.50:1Same as -J2A but with 20_ timing, lower comp. ratio and lower power-15
O-235-L2C1182800100/100LL8.50:1Same as -L2A but with Slick Magnetos -15
O-235-M11182800100/100LL8.50:1Similar to -L2A but with provision for controllable prop. and has AS-127, Type 2 prop. flange-15
O-235-M2C1182800100/100LL8.50:1Similar to -M1 but has AS-127, Type 1 propeller flange and Slick magnetos.-15
O-235-M3C1182800100/100LL8.50:1Similar to -M1 but has Slick magnetos and uses 7/16 inch propeller bolts instead of 3/8 inch bolts.-15
O-235-N2A1162800100/100LL8.10:1Same as -L2A but lower comp. ratio and power -15
O-235-N2C11628001O0/100LL8.10:1Same as -L2C but lower comp. ratio and power -15
O-235-P11162800100/100LL8.10:1Same as -M1 but lower comp. ratio and power-15
O-235-P2A1162800100/100LL8.10:1Similar to -P1 but has AS-127, Type 1 propeller flange -15
O-235-P2C116280010O/100LL8.10:1Same as -M2C but lower comp. ratio and power-15
O-235-P3C11628001OO/100LL8.10:1Same as -M3C but lower comp. ratio and power-15
ModelHPT/O
RPM		FuelC.R.DESCRIPTIONSuffix
O-290-D1302800806.50:1Solid tappets, Hydro control -21
O-290-111272800806.50:1Same as O-290-D -21
O-290-D21402800807.50:1Hydraulic tappets, 18 degree spark advance-21
O-290-D2A1402800807.50:1Same as -D2 but new crankcase for controllable prop. -21
O-290-D2B1402800807.00:1Same as -D2, 25_ spark advance and lower C.R. -21
O-290-D2C1402800807.00:1Same as -D2B with Retard Breaker Magnetos -21
ModelHPT/O
RPM		FuelC.R.DESCRIPTIONSuffix
O-320-A1A1502700807.00:1Controllable propeller, 25 degree spark advance Bendix S4LN-20 and S4LN-21 Magnetos-27
O-320-A1B1502700807.00:1Same as -A1A with straight riser in oil sump and -32 carburetor-27
O-320-A2A1502700807.00:1Same as -A1A but fixed pitch propeller -27
O-320-A2B1502700807.00:1Same as -A2A with straight riser in oil sump and -32 carburetor-27
O-320-A2C1502700807.00:1Same as -A2B with Retard Breaker Magnetos -27
O-320-A2D1502700807.00:1Same as -E3D but with conical mounts and 0-320-A sump and intake pipes-27
O-320-A3A1502700807.00:1Same as -A1A but uses 7/16 in. dia. propeller bolts -27
O-320-A3B1502700807.00:1Same as -A3A except for straight riser in oil sump and -32 carburetor-27
O-320-A3C1502700807.00:1Same as -A3B except for Retard Breaker Magnetos -27
O-320-B1A1602700100/100LL8.50:1Same as -A1A but high C.R.-39
O-320-B1B1602700I00/100LL8.50:1Same as -B1A except for straight riser in od sump and -32 carburetor-39
O-320-B2A1602700100/100LL8.50:1Same as -B~ fixed pitch propeller-39
O-320-B2B1602700100/100LL8.50:1Same as -B2A except for straight riser in oil sump and -32 carburetor -39
O-320-B2C1602700100/100LL8.50:1Same as -B2B except for Retard Breaker Magnetos -39
O-320-B2D1602700100/100u8.50:1Same as -DID except fixed propeller and conical mounts -39
O-320-B3A1602700100/100LL8.50:1Same as -B1A except for 7/16 inch propeller attaching bolts-39
O-320-B3B1602700100/100LL8.50:1Same as -B~ except for 7~6 inch attaching bolts and straight riser in oil sump and -32 carburetor-39
O-320-B3C1602700100/100LL8.50:1Same as -B3B except for Retard Breaker Magnetos -39
O-320-C1A1502700807.00:1Low compression field service conversion of -B1A -39
O-320-C1B1502700807.00:1Low compression field service conversion of -BIB -39
O-320-C2A1502700807.00:1Low compression field service conversion of -B2A -39
O-320-C2B1502700807.00:1Low compression field service corrversion of -B2B -39
O-320-C2C1502700807.00:1Low compression field service conversion of -B2C -39
O-320-C3A1502700807.00:1Low compression field service conversion of -B3A -39
O-320-C3B1502700807.00:1Low compression field service conversion of -B3B -39
O-320-C3C1502700807.00:1Low compression field service conversion of -B3C -39
O-320-D1A1602700100/100LL8.50:1Same as -B3B but with Type 1 dynafocal mounts -39
O-320-D1B1602700100/100LL8.50:1Same as -D~ except for Retard Breaker Magnetos-39
O-320-D1C1602700100/100LL8.50:1Same as -D2C but with provision for controllable prop. -39
O-320-D1D1602700100/100LL8.50:1Similar to -D1A but has horizontal carburetor and in- duction housing and has Slick Magnetos -39
O-320-D1F1602700100/100LL8.50:1Same as -E1F except has high compression pistons -39
O-320-D2A1602700100/100LL8.50:1Same as -DIA but with fixed pitch propeller and 3/8 in. attaching bolts-39
O-320-D2B1602700100/100LL8.50:1Same as -D2A except for Retard Breaker Magnetos -39
O-320-D2C1602700100/100LL8.50:1Same as -D2A except for -1200 series Magnetos -39
O-320-D2F1602700100/100LL8.50:1Same as -E2F except has high compression pistons -39
O-320-D2G1602700100/100LL8.50:1Same as -D2A but with Slick Magnetos, 7/16 instead of 3/8 in. propeller flange bolts-39
O-320-D2H1602700100/100LL8.50:1Same as -D2G but with 0-320-B sump and intake pipes and has provision for AC type fuel pump-39
O-320-D2J1602700100/100LL8.50:1Similar to -D2G but has (2) Slick impulse coupling magnetos and an unmachined governor pad on front of crankcase-39
O-320-D3G1602700100/100LL8.50:1Same as -D2G but with 3/8 in. propeller attaching bolts and has provisions for fuel pump-39
O-320-E1A1502700807.00:1Same as -A3B but with Type 1 dynafocal mounts -27
O-320-E1B1502700807.00:1Same as -ETA except for Retard Breaker Magnetos -27
O-320-E1C1502700807.00:1Same as -ETA but has -1200 series Magnetos -27
O-320-E1F1502700807.00:1Same as -E1C but with propeller governor drive on left front of crankcase-27
O-320-EU1502700807.00:1Same as -E1F but has Slick Magnetos-27
O-320-E2A150/
140		2700/
2450		807.00:1Same as -ETA but with fixed pitch propeller and uses 3/8 inch attaching bolts and has alternate rating of 140 at 2450 RPM.-27
O-320-E2B1502700807.00:1Same as -E2A except for Retard Breaker Magnetos -27
O-320-E2C150/
140		2700/
2450		807.00:1Same as -E2A but has -1200 series Magnetos -27
O-320-E2D1502700807.00:1Similar to -E2A but with Slick Magnetos, O-235 front main bearing and 7/16 inch propeller flange bushings-27
O-320-E2F1502700807.00:1Same as -E1F but with fixed pitch propeller -27
O-320-E2G1502700807.00:1Same as -E2D but has 0-320-A sump and intake pipes -27
O-320-E2H1502700807.00:1Same as -E2D but equipped with S4LN-20 and -21 Mags. -27
O-320-E3D1502700807.00:1Same as -E2D but uses 3/8 inch instead of 7/16 inch propeller flange bushings-27
O-320-E3H1502700807.00:1Same as -E3D but equipped with S4LN-20 and -21 Mags. -27
O-320-H1AD1602700100/100LL9.00:1Integral accessory section cIankcase, front mounted fuel pump, external mounted oil pump and D4RN-3000 impulse coupling dual magneto-76
O-320-H1BD1602700100/100LL9.00:1Same as -H1AD but with D4RN-3200 retard breaker dual magneto-76
O-320-H2AD1602700100/100LL9.00:1Same as -H1AD but with fixed pitch propeller -76
O-320-H2BD1602700100/100LL9.00:1Same as -H2AD but with D4RN-3200 retard breaker dual magneto-76
O-320-H3AD1602700100/100LL9.00:1Same as -H2AD but uses 3/8 inch instead of 7/16 inch propeller flange bushings-76
O-320-H3BD1602700100/100LL9.00:1Same as -H3AD but with D4RN-3200 retard breaker dual magneto-76
IO-320-A1A1502700807.00:1Same as O-320-E1B but with rear Bendix fuel injection and Type 2 dynafocal mounts-55
IO-320-A2A1502700807.00:1Same as -A1A but with fixed pitch propeller and 3/8 inch propeller flange bushings-55
IO-320-B1A1602700100/100LL8.50:1Same as O-320-D1A but with Type 2 dynafocal mounts and rear mounted Bendix fuel injector-55
IO-320-B1B1602700100/100LL8.50:1Same as -B1A but has AN fuel pump drive-55
IO-320-B1C1602700100/100LL8.50:1Same as -B1A but has adapter for mounting fuel injector straight to the rear-55
IO-320-B1D1602700100/100LL8.50:1Same as -B1C but with -1200 series Retard Magnetos -55
IO-320-B1E1602700100/100LL8.50:1Same as -D1C but with rear mounted horizontal fuel injector-55
IO-320-B2A1602700100/100LL8.50:1Same as -B1A but with fixed pitch propeller and 3/8 inch propeller flange bushings-55
IO-320-C1A1602700100/100LL8.50:1Same as -B1A except converted for use with turbocharger, long reach spark plugs, piston cooling oil jets, vented fuel nozzles, two S4LN-21 impulse coupling magnetos and AN fuel pump drive-55
IO-320-ClB1602700100/100LL8.50:1Same as -CIA but with fuel injector mounted straight to the rear and 24 volt system standard-55
IO-320-D1A1602700100/10OLL8.50:1Same as O-320-D2C except has Bendix RSA-5AD1 fuel injector, provision for controllable propeller and 7/16 inch propeller flange bushings-55
IO-320-D1B1602700100/100LL8.50:1Same as -D1A but with propeller governor drive on left front of crankcase-55
IO-320-D1C1602700100/100LL8.50:1Same as -D1B but with Slick Magnetos, 24 volt system and 100 amp alternator standard-55
IO-320-E1A1502700807.00:1Same as O-320-A3B except has Bendix fuel injector -55
IO-320-E1B1502700807.00:1Same as -ETA but with Slick Magnetos -55
IO-320-E2A1502700807.00:1Same as -ETA but with fixed pitch propeller and 3/8 inch propeller flange bushings-55
IO-320-E2B1502700807.00:1Same as O-320-A2D but with Bendix RSA-5AD1 fuel injector-55
IO-320-F1A1602700100/100LL8.50:1Same as -CIA but with Type 1 dynafocal mounts -55
LIO-320-BlA1602700100/100LL8.50:1Similar to IO-320-BL~ but has left hand rotation crankshaft-66
LIO-320-C1A1602700100/100LL8.50:1Similar to IO-320-C1A but has left hand rotation crankshaft-66
AIO-320-A1A1602700100/100LL8.50:1Aerobatic engine with performance similar to IO-320-D-65
AIO-320-A1B1602700100/100LL8.50:1Same as -A1A but has impulse coupling Magneto-65
AIO-320-A2A1602700100/100LL8.50:1Same as -A1A but with fixed pitch propeller-65
AIO-320-A2B1602700100/100LL8.50:1Same as -A2A but has impulse coupling Magneto-65
AIO-320-B1B1602700100/100LL8.50:1Similar to -A1B but with front mounted fuel injector -65
AIO-320-C1B1602700100/100LL8.50:1Similar to -BIB but the fuel injector is vertically mounted on the bottom of the sump-65
AEIO-320-D1B1602700100/100LL8.50:1Same as IO-320-D1B but is equipped with Aerobatic kit -55
AEIO-320-D2B1602700100/100LL8.50:1Same as -D1B but with fixed pitch propeller-55
AEIO-320-E1A1502700807.00:1Same as IO-320-E1A but is equipped with Aerobatic kit -55
AEIO-320-E1B1502700807.00:1Same as IO-320-E1B but is equipped with Aerobatic kit -55
AEIO-320-E2A1502700807.00:1Same as IO-320-E2A but is equipped with Aerobatic kit -55
AEIO-320-E2B1502700807.00:1Same as IO-320-E2B but is equipped with Aerobatic kit -55
ModelHPT/O
RPM		FuelC.R.DESCRIPTIONSuffix
O-340-A1A1702700100/100LL8.50:1Controllable propeller-30
O-340-A1B1702700100/100LL8.50:1Same as -A1A except for Retard Breaker Magnetos -30
O-340-A2A1702700100/100LL8.50:1Same as -A1A but fixed pitch propeller-30
O-340-B1A1602700807.15:1Low compression -AL9-30
O-340-B2A1602700807.15:1Low compression -A2A-30
O-360-A1A1802700100/100LL8.50:1Dynafocal mounts-36
O-360-A1AD1802700100/100LL8.50:1Same as -A1A but with D4LN-3000 impulse coupling dual magnetos-36
O-360-A1C1802700100/100LL8.50:1Similar to -A1A but has horizontal induction housing, Bendix PSH-5BD pressure carburetor and retard breaker magnetos-36
O-360-A1D1802700100/100LL8.50:1Same as -A1A except for Retard Breaker Magnetos -36
O-360-A1F1802700100/100LL8.50:1Same as -ALA with -1200 series Magnetos-36
O-360-A1F61802700100/100LL8.50:1Same as -A1F but has (1) sixth and (V eighth order counterweights-36
O-360-A1F6D1802700100/100LL8.50:1Same as -A1F6 but with D4LN-3000 impulse coupling dual magnetos-36
O-360-A1G1802700100/100LL8.50:1Similar to -A1F but has horizontal carburetor and induction housing-36
O-360-A1G61802700100/100LL8.50:1Same as -A1G but has (1) sixth and (1) eighth order counterweights-36
O-360-A1G6D1802700100/100LL8.50:1Same as -A1G6 but with D4LN-3000 impulse coupling dual magneto-36
O-360-A1H1802700100/100LL8.50:1Same as -A1G but with propeller governor drive on left front of crankcase and -21, -204 magnetos-36
O-360-A1H61802700100/100LL8.50:1Same as -A1H but has (1) sixth and (1) eighth order counterweights-36
O-360-A1LD1802700100/100LL8.50:1Similar to -A1A but with D4LN-3000 impulse coupling dual magneto and has propeller governor drive on left front of crankcase-36
O-360-A1P*1802700100/100LL8.50:1Same as -C1G except dynafocal mounts -36
O-360-A2A1802700100/100LL8.50:1Same as -A1A but fixed pitch propeller -36
O-360-A2D1802700100/100LL8.50:1Same as -A2A except for Retard Breaker Magnetos -36
O-360-A2E1802700100/100LL8.50:1Same as -A2D with provision for AN fuel pump drive -36
O-360-A2F1802700100/100LL8.50:1Same as -A2A with -1200 series Magnetos -36
O-360-A2G1802700100/100LL8.50:1Same as -A1G but fixed pitch propeller-36
O-360-A2H1802700100/100LL8.50:1Same as -A1H but has fixed pitch propeller-36
O-360-A3A1802700100/100LL8.50:1Same as -A2A but has 6 special long bushings in propeller flange-36
O-360-A3AD1802700100/100LL8.50:1Same as -~ but with D4LN-3000 impulse coupling dual magneto-36
O-360-A3D1802700100/100LL8.50:1Same as -A3A except for Retard Breaker Magnetos -36
O-360-A4A1802700I00/100LL8.50:1Same as -A3A but has solid crankshaft-36
O-360-A4AD1802700100/100LL8.50:1Same as -A4A but with D4LN-3000 impulse coupling dual magneto-36
O-360-A4D1802700100/100LL8.50:1Similar to -A4A except with Retard Breaker Magnetos, (2) magneto drive isolators and -A2A propeller flange bushings-36
O-360-A4G1802700100/1O0LL8.50:1Same as -A2G but has -A4A crankshaft with -A2G propeller flange bushings-36
O-360-A4J18027001O0/100LL8.50:1Same as -A4G but has -21 and -204 Magnetos -36
O-360-A4K1802700100/100LL8.50:1Same as -A4J but with Slick Magnetos -36
O-360-A4M1802700100/100LL8.50:1Same as -A4A but with Slick Magnetos -36
O-360-A4N1802700100/100LL8.50:1Same as -A4M but has an unmachined governor pad on front of crankcase and -A2G propeller flange bushings-36
O-360-A4P*1802700100/100LL8.50:1Same as -A4M except for propeller flange bushings -36
O-360-A5AD1802700100/100LL8.50:1Same as -A4AD but has standard length propeller flange bushings-36
O-360-B1A1682700807.20:1Same as -A1A but low compression ratio -36
O-360-B1B1682700807.20:1Same as -B1A except for Retard Breaker Magnetos -36
O-360-B2A1682700807.20:1Same as -B1A except for fixed pitch propeller -36
O-360-B2B1682700807.20:1Same as -B2A except for Retard Breaker Magnetos -36
O-360-B2C1682700807.20:1Same as -B2A except has IO-360-A crank and rods -36
O-360-C1A1802700100/100LL8.50:1Same as -A1A but conical rubber mounts -36
O-360-C1C1802700100/100LL8.50:1Same as -CIA except for Retard Breaker Magnetos -36
O-360-C1E1802700100/100LL8.50:1Same as -CIA but with Slick Magnetos -36
O-360-C1F1802700100/100LL8.50:1Same as -A1G with conical mounts and Slick magnetos -36
O-360-C1G1802700100/100LL8.50:1Same as -CIA but with propeller governor drive on left front of crankcase-36
O-360-C2A1802700100/100LL8.50:1Same as -CIA but fixed pitch propeller -36
O-360-C2B1802700100/100LL8.50:1Same as -CIA but fixed pitch propeller and horizontal pressure carburetor and has helicopter rating-36
O-360-C2C1802700100/100LL8.50:1Same as -C2A except for Retard Breaker Magnetos -36
O-360-C2D1802700100/100LL8.50:1Same as -C2B except for Retard Breaker Magnetos -36
O-360-C2E1802700100/100LL8.50:1Same as -C2A but with Slick Magnetos -36
O-360-C4F1802700100/100LL8.50:1Same as -C1F except has solid crankshaft and no provision for propeller governor-36
O-360-C4P18027001O0/100LL8.50:1Same as -A4M except for propeller flange bushings and conical mounts-36
O-360-D1A1682700807.20:1Same as -B1A but conical rubber mounts and -1200 series magnetos-36
O-360-D2A1682700807.20:1Same as -B2A but conical rubber mounts -36
O-360-D2B1682700807.20:1Same as -D2A except for Retard Breaker Magnetos -36
O-360-E1A6D11302700100/100LL9.00:1Integral accessory section crainkcase, front mounted fuel pump, external oil pump, D4RN-3000 impulse coupling dual magnetos and counterweighted crankshaft-77
O-360-F1A61802700100/100LL8.50:1Similar to O-360-A series with new sump for nose wheel clearance, rear HA-6 carburetor, has (1) sixth and (1) eigth order counterweights and has propeller governor drive on left front of crankcase-36
O-360-G1A61802700100/100LL8.50:1Same as -F1A6 but with a machined pad on right front of crankcase-36
HO-360-A1A1802700100/100LL8.50:1Same as 0-360-A2D but with MA-4-SAA carburetor and type 2 dynafocal mounts-36
HO-360-B1A1802900100/100LL8.50:1Same as 0-360-C2D except for rated speed -36
HO-360-B1B1802900100/100LL8.50:1Same as -B1A but with two (2) S4LN-200 Magnetos -36
IO-360-A1A2002700100/100LL8.70:1Bendix fuel injection, tuned induction -51
IO-360-A1B2002700100/100LL8.70:1Same as -A1A but has -1200 series impulse coupling magnetos-51
IO-360-A1B62002700100/100LL8.70:1Same as -A1B but has (1) sixth and (1) eighth order counterweights-51
IO-360-A1B6D2002700100/10OLL8.70:1Same as -A1B6 but has (1) Bendix D4LN-3000 impulse coupling dual Magneto-51
IO-360-A1C2002700100/100LL8.70:1Same as -A1A but with -1200 series Magnetos -51
IO-360-A1D2002700100/100LL8.70:1Same as -A1B but has S4LN-21 impulse coupling and S4LN-204 Magnetos-51
IO-360-A1D62002700100/100LL8.70:1Same as -A1B6 but with propeller governor drive on left front of crankcase-51
IO-360-A1D6D2002700100/100LL8.70:1Same as -A1D6 but has (1) Bendix D4LN-3000 impulse coupling dual magneto-51
IO-360-A2A2002700100/100LL8.70:1Same as -A1A but fixed pitch propeller -51
IO-360-A2B2002700100/100LL8.70:1Same as -A2A but has -1200 series impulse Magnetos -51
IO-360-A2C2002700100/100LL8.70:1Same as -A1C but has fixed pitch propeller -51
IO-360-A3B62002700100/100LL8.70:1Same as -A1B6 with propeller flange bushings rotated 120 degrees clockwise-51
IO-360-A3B6D2002700100/100LL8.70:1Same as -A1B6D but with propeller locating bushings rotated 120 degrees clockwise-51
IO-360-A3D6D2002700100/100LL8.70:1Same as -A1D6D but with propeller locating bushings rotated 120 degrees clockwise-51
IO-360-B1A1802700100/100LL8.50:1Same as O-360-A1D except for Simmonds 530 Fuel Injection System-51
IO-360-B1B1802700100/100LL8.50:1Same as -B1A except for Bendix Fuel Injection System -51
IO-360-B1C1772700100/100LL8.50:1Conversion of O-360-A1C to Bendix Fuel Injection -51
IO-360-B1D1802700100/100LL8.50:1Same as -BIB but with AN fuel pump drive -51
IO-360-B1E1802700100/1OOLL8.50:1Similar to -BIB with rear mounted fuel injection and -1200 series impulse coupling magnetos-51
IO-360-B1F1802700100/100LL8.50:1Similar to -BIB except has (2) -1227 Magnetos -51
IO-360-B1F61802700100/100LL8.50:1Same as -B1F but with one (V sixth and (1) eighth order counterweights-51
IO-360-B2E1802700100/100LL8.50:1Same as -B1E but has Wed pitch propeller -51
IO-360-B2F1802700100/100LL8.50:1Same as -B1F but fixed pitch propeller -51
IO-360-B2F61802700100/100LL8.50:1Same as -B2F but with one a) sixth and one (1) eighth order counterweights-51
IO-360-B4A1802700100/100LL8.50:1Similar to -BIB but has S4LN-21 (impulse coupling) and S4LN-20 magnetos and O-360-A4A solid crankshaft-51
IO-360-C1A2002700100/100LL8.70:1Same as -A~ but with rear air inlet -51
IO-360-C1B2002700100/100LL8.70:1Same as -CIA but with -1200 series Magnetos -51
IO-360-C1C2002700I00/100LL8.70:1Similar to -C1B but has 14_ injector adapter and impulse Magneto-51
IO-360-C1C62002700100/1OOLL8.70:1Same as -C1C but with one (1) sixth and one (1) eighth order counterweights-51
IO-360-C1D62002700100/100LL8.70:1Similar to -C1C but has straight injector inlet and has (1) sixth and (1) eighth order counterweights-51
IO-360-C1E62002700100/100LL8.70:1Similar to -C1C but has propeller governor drive on left front of crankcase, has (1) sixth and (1) eighth order counterweights-51
IO-360-C1E6D2002700100/100LL8.70:1Same as -C1E6 but with D4LN-3000 impulse coupling dual Magneto-51
IO-360-C1F2002700100/100LL8.70:1Same as -C1C but with AN fuel pump drive and pump-51
IO-360-D1A2002700100/100LL8.70:1Same as -C1B but has Type 2 dynafocal mounts-51
IO-360-E1A1802700100/100LL8.50:1Similar to -B1E but has Type 2 dynafocal mounts and Retard Breaker Magnetos-51
IO-360-FlA1802700100/100LL8.50:1Similar to -B1E except converted for use with turbocharger-51
IO-360-J1AD2002700100/10LL8.70:1Similar to -A1B except equipped with a D4LN-3000 dual magneto and has a rear type engine mount similar to TO-360-F1A6D-51
IO-360-J1A6D2002700100/100LL8.70:1Same as -J~D but with O) sixth and (1) eighth order counterweights.-51
IO-360-K2A2002700100/100LL8.70:1Same as -A2A but has Bendix S4LN-21 impulse coupling and S4LN-20 magnetos and provision for straight conical mounts-51
LO-360-A1G6D1802700100/100LL8.50:1Similar to O-360-A1G6D but has left hand rotation crankshaft-71
LO-360-A1H61802700100/100LL8.50:1Similar to O-360-A1H6 but has left hand rotation crankshaft-71
LO-360-E1A6D1802700100/100LL9.00:1Similar to O-360-ELA6D but has left hand rotation crankshaft-72
TO-360-A1A6D2002575100/100LL8.00:1Similar to 0-360-A1F6D but with HA-6 horizontal carburetor ahead of Rajay turbocharger, lower speed, lower C.R. and higher power-69
TO-360-C1A6D2102575100/100LL7.30:1Similar to -A1A6D except for rating, compression ratio, carburetor and turbocharger location and turbocharger controls-69
TO-360-E1A6D1802575100/100LL8.00:1Similar to O-360-ELA6D but with AiResearch TA04 Turbocharger, lower speed and lower compression ratio-73
TO-360-F1A6D2102575100/100LL7.30:1Same as -C1A6D with long type 1.12,, conical mount-69
VO-360-A1A1802900100/100LL8.50:1Vertical crankshaft (Brantly Modification)-45
VO-360-A1B1802900100/100LL8.50:1Same as -A1A except for altitude compensated carburetor and retard Breaker Magnetos-45
VO-360-B1A1802900100/100LL8.50:1Same as -A1B but with piston cooling oil jets-45
AIO-360-A1A2002700100/100LL8.70:1Aerobatic engine with performance similar to IO-360-A1A-63
AIO-360-A1B2002700100/100LL8.70:1Same as -A1A but has impulse Magnetos-63
AIO-360-A2A2002700100/100LL8.70:1Same as -A1A but does not have provision for controllable propeller-63
AIO-360-A2B2002700100/100LL8.70:1Same as -A2A but has impulse Magnetos-63
AIO-360-B1B2002700100/100LL8.70:1Similar to -A1B but with front mounted fuel injector-63
HIO-360-A1A1802900100/100LL8.70:1Rated power to 3900 feet, imilar to HO-360-B1B but has Bendix fuel injector, angle valve cylinders and higher C.R.-51
HIO-360-A1B1802900100/100LL8.70:1Similar to -A1A except conical mounts, no AMC unit on fuel injector and 90_ fuel injector mount-51
HIO-360-B1A1802900100/100LL8.50:1Similar to HO-360-B1B but has Bendix fuel injector and dual diaphragm fuel pump-51
HIO-360-B1B1802900100/100LL8.50:1Same as -B1A but has AN fuel pump drive-51
HIO-360-C1A2052900100/100LL8.70:1Similar to -A1A but has higher sea level rating and type 2 dynafocal mounts-51
HIO-360-C1B2052900100/100LL8.70:1Same as -CIA but has -1200 series Magnetos-51
HIO-360-D1A1903200100/100LL10.00:1Similar to -A1A but has -1200 series Magnetos and Bendix RSA-7AA1 fuel injector-51
HIO-360-E1AD1902900100/100LL8.00:1Similar to -CIA except for compression ratio, rating D4LN-3000 impulse coupling dual magneto and provision for turbocharging-51
HIO-360-E1BD19029001O0/100LL8.00:1Same as -E1AD but has D4LN-3200 Retard Breaker Magneto-51
HIO-360-FlAD1903050100/100LL8.00:1Similar to -E1AD but has heavier crankshaft, and higher RPM-51
IVO-360-A1A1802900100/100LL8.50:1Same as VO-360-B1A but with Bendix Fuel Injection-58
LIO-360-C1E62002700100/100LL8.70:1Similar to IO-360-C1E6 but has left hand rotation crankshaft-67
LTO-360-A1A6D2002575100/100LL8.00:1Similar to TO-360-MA6D but has left hand rotation crankshaft-70
LTO-360-E1A6D1802575100/100LL8.00:1Similar to TO-360-E1A6D but has left hand rotation crankshaft-74
TIO-360-A1A2002575100/100LL7.30:1Similar to IO-360-C1B but has turbocharger (TE0659) and lower rated speed-64
TIO-360-A1B2002575100/100LL7.30:1Same as -A1A but does not have suck-open door-64
TIO-360-A3B62002575100/100LL7.30:1Similar to -A1B but has (1) sixth and (1) eighth order counterweights, provision for 3-bladed propeller, large fuel pump, conduit harness and pressurized Mags.-64
TIO-360-C1A6D2102575100/100LL7.30:1Same as TO-360-C1A6D but has a Bendix RSA-5AD1 Fuel Injector-64
LHIO-360-C1A2052900100/100LL8.70:1Similar to HIO-360-C1A but has left hand rotation crankshaft-67
LHIO-360-C1B2052900100/100LL8.70:1Similar to HIO-360-C1B but has left hand rotation crankshaft-67
LHIO-360-F1AD1903050100/100LL8.00:1Similar to HIO-360-F1AD but has left hand rotation crankshaft-67
AEIO-360-A1A2002700100/100LL8.70:1Same as IO-360-A1A but is equipped with Aerobatic kit-51
AEIO-360-A1B2002700100/100LL8.70:1Same as IO-360-A1B but is equipped with Aerobatic kit-51
AEIO-360-A1B62002700100/100LL8.70:1Same as IO-360-A1B6 but is equipped with Aerobatic kit-51
AEIO-360-A1C2002700100/100LL8.70:1Same as IO-360-A1C but is equipped with Aerobatic kit-51
AEIO-360-A1D2002700100/100LL8.70:1Same as IO-360-A1D but is equipped with Aerobatic kit-51
AEIO-360-A1E2002700100/100LL8.70:1Same as -AID but with prop. governor drive on left front of crankcase-51
AEIO-360-A1E6*2002700100/l00LL8.70:1Same as -ATE but has (1) sixth and (1) eighth order counterweights-51
AEIO-360-A2A2002700100/lO0LL8.70:1Same as IO-360-A2A but is equipped with Aerobatic kit-51
AEIO-360-A2B2002700100/l00LL8.70:1Same as IO-360-A2B but is equipped with Aerobatic kit-51
AEIO-360-A2C2002700100/100LL8.70:1Same as IO-360-A2C but is equipped with Aerobatic kit-51
AEIO-360-B1B1802700100/100LL8.50:1Same as IO-360-B1B but is equipped with Aerobatic kit-51
AEIO-360-B1D1802700100/100LL8.50:1Same as IO-360-B1D but is equipped with Aerobatic kit-51
AEIO-360-B1F1802700100/100LL8.50:1Same as IO-360-B1F but is equipped with Aerobatic kit-51
AEIO-360-B1F61802700100/100LL8.50:1Same as IO-360-B1F6 but is equipped with Aerobatic kit-51
AEIO-360-B1G61802700100/100LL8.50:1Same as -B1F6 but with Slick Magnetos-51
AEIO-360-B2F1802700100/100LL8.50:1Same as IO-360-B2F but is equipped with Aerobatic kit-51
AEIO-360-B2F61802700100/100LL8.50:1Same as IO-360-B2F6 but is equipped with Aerobatic kit-51
AEIO-360-B4A1802700100/100LL8.50:1Same as IO-360-B4A but is equipped with Aerobatic kit-51
AEIO-360-H1A1802700100/100LL8.50:1Similar to 0-360-C2E but with provision for controllable propeller, an RSA-5AD1 fuel injector, high pressure fuel pump and is equipped with Aerobatic kit-51

PISTON (6) SIX CYLINDER SERIES

ModelHPT/O
RPM		FuelC.R.DESCRIPTIONSuffix
O-435-A1902550806.50:1Rear mounted automotive type accessories-17
O-435-A22252550100/100LL7.50:1Same as -A except C.R.-17
O-435-42253000100/100LL6.50:1Kaman Helicopter Std. rear mounted accessories less 35-KV generator drive-25
GO-435-C2(11)2603400807.30:1Fuel grade depends on carburetor setting Ryan Navion MA-4-5 carburetor _-11
GO-435-C2(11A)2603400807.30:1Beech, PS-5 carburetor, dual governor and vacuum pump drive-11A
GO-435-C2(11B)2603400807.30:1Aero Commander; PS-5 carburetor no dual drive -11B
GO-435-C2A2603400807.30:1Std. -C2 with dry sump, heavy magnetos (Swiss engines) have -C2B reduction gear, PS-5 carburetor-11C
GO-435-C2A22603400807.30:1-C2A have lightweight magnetos-11C
GO-435-C2B2603400807.30:1Std. -C2 with propeller governor drive integral with reduction gear-11BA
GO-435-C2B12603400807.30:1-C2B with angle generator drive-11BA
GO-435-C2B22603400807.30:1-C2B with lightweight magnetos-11BA
GO-435-C2B262603400807.30:1-C2B2 with 6th order counterweight-11BA
GO-435-C2E2603400807.30:1Fuel grade depends on carburetor setting GO-435-C2 with lightweight magnetos-11AA
VO-435-A1A
(O-435-21)		2603400807.30:1Helicopter; crosswise accessory MA-4-5 carburetor, S6RN-20 and S6RN-21 magnetos (used GSO-480 accessory housing)-31
VO-435-A1B2603400807.30:1Helicopter; redesigned accessory housing (crosswise) S6LN-20, S6LN-21 magnetos, hand starter, no fuel pump or hydraulic pump drive-31
VO-435-A1C2603400807.30:1-A1B with wrap around crankcase, new oil sump fuel and hydraulic pump drive no hand starter AN-I-27 magnetos and harness optional-31
VO-435-A1D2603400807.30:1-A1B with wrap around crankcase and 4 pad oil sump-31
VO-435-A1E2603400807.30:1-AID except for Retard Breaker Magnetos-31
VO-435-A1F2603400807.30:1Similar to -ATE but has piston cooling oil jets and heavy heads, convertible to TVO-435-A1A-31
VO-435-B1A2653200100/100LL8.70:1High compression wet sump engine with redesigned crosswise accessory section-31
O-435-232553400807.30:1-A1B with fuel and hydraulic pump drives, AN-I-27 harness and magnetos, no hand starter (256 to 283 had -20 and -21 magnetos)-31
O-435-23A2553400807.30:1-23 with wrap around crankcase and 4 pad sump-31
O-435-23B2553400807.30:1-23A with altitude compensating carburetor-31
O-435-23C2553400807.30:1Same as -23B except has spring coupling accessory drive-31
O-435-62553400807.30:1-A1B with AN-I-27 harness and magnetos, altitude compensating carburetor-31
O-435-6A2553400807.30:1Same as 0-435-6 with wrap around crankcase and 4 pad sump-31
O-435-252603200100/100LL7.30:1Military version of TVO-435-BLA with TVO-435-A1A rating-52
TVO-435-A1A2603200100/100LL7.30:115,000 feet @ 3200 RPM, turbocharged vertical helicopter engine-52
TVO-435-B1A2703200100/100LL7.30:114,000 feet @ 3200 RPM, turbocharged vertical helicopter engine-52
TVO-435-B1B2703200100/100LL7.30:1Same as -B1A except for -1200 series Magnetos-52
TVO-435-C1A2803200100/100LL7.30:116,000 feet ~ 3200 RPM, turbocharged vertical helicopter engine-52
TVO-435-D1A2703200100/100LL7.30:1Same as -B1A but has TE0659 Turbocharger and -1200 series magnetos-52
TVO-435-D1B2703200100/100LL7.30:1Same as -D1A but has -200 series Magnetos-52
TVO-435-E1A2603200100/100LL7.30:1Similar to -~ but has TE0659 Turbocharger-52
TVO-435-FlA2803200100/100LL7.30:1Similar to -D1A but has wet sump and higher rating-52
TVO-435-G1A2803200100/100LL7.30:1Same as -D1A but has 280 HP rating-52
TVO-435-G1B2803200100/100LL7.30:1Same as -G1A but has -200 series Magnetos-52
ModelHPT/O
RPM		FuelC.R.DESCRIPTIONSuffix
GO-480-B2703400807.30:1High speed straight through generator drive and lightweight magnetos-28
GO-480-B1A62703400807.30:1GO-480-B with one sixth order and five third order counterweights-28
GO-480-B1B2703400807.30:1GO-480-B with low speed generator drive and heavy magnetos (GO-435-C2B with 5-1/8 in. bore)-28
GO-480-B1C2703400807.30:1GO-480-B with angle generator drive-28
GO-480-B1D2703400807.30:1GO-480-B1B with lightweight magnetos-28
GO-480-C1B62953400100/100LL8.70:1Dry sump, crosswise accessones (H. C. GO-480-D)-35
GO-480-C1D62953400100/100LL8.70:1High compression GO-480-B1D with 1.75 venturi carburetor-37
GO-480-C2C62953400100/100LL8.70:1High compression GO-480-F6-34
GO-480-C2D62953400100/100LL8.70:1-C2C6 with lightweight magnetos-34
GO-480-C2E62953400100/100LL8.70:1-C2D6 with angle generator drive (GO-480-B1C accessory housing)-34
GO-480-D1A2753400807.30:1Crosswise accessones, dry sump, lightweight magnetos, PS-5 carburetor with 1.75 venturi fuel pump and hydraulic pump drives-32
GO-480-F62753400807.30:1GO~480-B1B with flanged propeller shaft sixth order counterweight 1.75 venturi carburetor-29
GO-480-F1A62753400807.30:1-F6 with lightweight magnetos-29
GO-480-F2A62753400807.30:1-F1A6 with 20 spline prop. shaft and single oil supply-29
GO-480-F2D62753400807.30:1Conversion of -G1D6 to low compression for turbocharging-29
GO-480-F3A62753400807.30:1Low compression GO-480-C2D6 (Conversion)-34
GO-480-F3B62753400807.30:1Low compression GO-480-C2C6-34
GO-480-F4A62753400807.30:1-F~ with propeller shaft converted to single oil supply for Hartzell propeller with conversion kit P/N 71619 or propeller shaft no. 70414 or no. 70412 Reduction Gear Assembly-29
GO-480-F4B62753400807.30:1GO-480-F6 with propeller shaft converted to single oil supply for Hartzell propeller with conversion kit P/N 71619 or propeller shaft no. 70414 or no. 70412 Reduction Gear Assembly-29
GO-480-G1A62953400100/100LL8.70:1High compression GO-480-B1A6 piston cooling oil jets-42
GO-480-G1B62953400100/100LL8.70:1GO-480-C1B6 with piston cooling oil jets-35
GO-480-G1D62953400100/100LL8.70:1-C1D6 with piston cooling oil jets-37
GO-480-G1H62953400100/l00LL8.70:1Same as -G1D6 but with angle generator drive-34
GO-480-GU62953400100/100LL8.70:1Same as -G1A6 but with -1200 series Magnetos-34
GO-480-G2D62953400100/100LL8.70:1GO-480-C2D6 with piston cooling oil jets-34
GO-480-G2F629534001O0/100LL8.70:1Same as -G2D6 except for Retard Breaker Magnetos-34
IGO-480-A1A62953400100/100LL8.70:1Similar to GO-480-GU6 but has Bendix RSA-5AD1 fuel injector-56
IGO-480-A1B62953400100/100LL8.70:1Similar to GO~80-G1A6 but has Bendix RSA-5AD1 fuel injector-56
GSO-480-A1A63403400100/100LL7.30:1Supercharged, dry sump, crosswise accessories, lightweight magnetos-33
GSO-480-A1C63403400100/100LL7.30:1Same as -A1A6 except for supercharger inlet thermocouple-33
GSO-480-A2A63403400100/100LL7.30:1Conversion of -A1A6 to flanBed reduction gear for reversible propeller-33
GSO-480-B1A63403400100/100LL7.30:1GSO~80-A1A6 with piston cooling oil jets, and updraft carburetor-33
GSO-480-B1B33403400100/100LL7.30:1Same as -B1H6 except Torsional Damper System has been modified-33
GSO-480-B1B63403400100/100LL7.30:1GSO-480-B1A6 with horizontal elbow and carburetor under engine-33
GSO-480-B1C63403400100/100LL7.30:1GSO-480-B1A6 with horizontal carburetor mounted directly on straight thru air inlet supercharger housing-33
GSO-480-B1E63403400100/100LL7.30:1Same as -B1A6 except for Retard Breaker Magnetos-33
GSO-480-B1F63403400100/100LL7.30:1Same as -B1B6 except for Retard Breaker Magnetos-33
GSO-480-B1G63403400100/100LL7.30:1Same as -B1C6 except for Retard Breaker Magnetos-33
GSO-480-BU63403400100/100LL7.30:1Same as -B1A6 but with -1200 series Magnetos-33
GSO-480-B2C63403400100/100LL7.30:1Same as -B1C6 but with flanged reduction gear for reversible propeller-33
GSO-480-B2D63403400100/100LL7.30:1GSO-480-B1A6 with flange propeller shaft and down- draft PSD-78D carburetor-33
GSO-480-B2G63403400100/100LLL7.30:1Same as -B2C6 with Retard Breaker Magnetos-33
GSO-480-B2H63403400100/100LL7.30:1Same as -B2D6 except for Retard Breaker Magnetos-33
O-480-1**,-1A3403400100/100LL7.30:1Like Beech version of GSO-480-B1B6 (Horizontal carburetor under engine) with -22 and -23 magnetos-33A
IGSO-480-AlA63403400100/100LL7.30:1Simmonds Fuel Injection Version of GSO~80-B1B6-44
IGSO-480-A1B63403400100/100LL7.30:1Same as -A1A6 except for Retard Breaker Magnetos-44
IGSO-480-A1C63403400100/100LL7.30:1Same as -A1A6 except for horizontal air inlet housing and throttle body-44
IGSO-480-A1D63403400100/100LL7.30:1Conversion of GSO-480-B1A6 to Bendix fuel injection-44
IGSO-480-A1E63403400100/100LL7.30:1Same as -A1D6 except for air inlet housing mounts injector 35 deg. forward of vertical and has Retard Breaker Magnetos-44
IGSO-480-A1F33403400100/100LL730:1Same as -A1F6 except Torsional Damper System has been modified-44
IGSO-480-A1F63403400100/100LL7.30:1Same as -A1C6 except for Retard Breaker Magnetos-44
IGSO-480-A1G63403400100/100LL7.30:1Similar to -A1E6 but has -1200 series Magnetos and has fuel flow modulator removed-44
O-480-33403400100/~00LL7.30:1IGSO-480-A1A6 but with -22 and -23 magnetos-44
ModelHPT/O
RPM		FuelC.R.DESCRIPTIONSuffix
O-540-ALA250/
235		2575/
2400		100/100LL8.50:1Two sixth order counterweights-40
O-540-A1A5250/
235		2575/
2400		100/100LL8.50:1Same as O-540-A1A but one fifth and one sixth order counterweights-40
O-540-A1B5250/
235		2575/
2400		100/100LL8.50:1Same as -A1A5 except for short propeller governor studs and two impulse magnetos-40
O-540-A1C5250/
235		2575/
2400		100/100LL8.50:1Same as -A1A5 except for two impulse magnetos-40
O-540-A1D250/
235		2575/
2400		100/100LL8.50:1Same as -A1B5 except for two sixth order counterweights with Retard Breaker Magnetos-40
O-540-A1D5250/
235		2575/
2400		100/100LL8.50:1Same as -A1B5 except for Retard Breaker Magnetos-40
O-540-A2B250/
235		2575/
2400		100/100LL8.50:10-540-A1A with short propeller governor studs and propeller locating bushing, relocate 60 deg counter clockwise-40
O-540-A3D52502575100/100LL8.50:1Special Navy "Aztec", Same as -A1D5 except for provision for propeller de-icing and chrome barrels, 24 volt system std.-40
O-540-A4A5250/
235		2575/
2400		100/100LL8.50:1Same as -A1A5 but with more effective counterweights for use with Hartzell "compact" propeller-40
O-540-A4B5250/
235		2575/
2400		100/100LL8.50:1Same as -A1B5 but with more effective counterweights for use with Hartzell "compact" propeller-40
O-540-A4C5250/
235		2575/
2400		100/100LL8.50:1Same as -A1C5 but with more effective counterweights for use with Hartzell "compact" propeller-40
O-540-A4D5250/
235		2575/
2400		100/100LL8.50:1Same as -A1D5 but with more effective counterweights for use with Hartzell "compact" propeller-40
O-540-B1A52352575807.20:1Same as -A1D5 but low C.R.-40
O-540-B1B52352575807.20:1Same as -B1A5 but with impulse coupling magnetos and a field conversion of 0-540-A1A5, -A1B5, or -A1C5 to low compression-40
O-540-B1D52352575807.20:1-B1A5 with -1200 series Magnetos-40
O-540-B2A52352575807.20:1Same as -B1A5 but does not have provision for controllable propeller-40
O-540-B2B52352575807.20:1Same as -B2A5 but with impulse coupling magnetos-40
O-540-B2C52352575807.20:1Same as -B2B5 but has -1200 series Magnetos-40
O-540-B4A52352575807.20:1Same as -B1B5 but with more effective counterweights for use with Hartzell "compact" propeller-40
O-540-B4B52352575807.20:1Same as rBlB5 but with more effective counterweights for use with Hartzell "compact" propeller-40
O-540-D1A52502575100/100LL8.50:1Same as -A1D5 but with Bed-type mounts-40
O-540-E4A52602700100/i00LL8.50:1Same as -A4D5 except for higher speed and rating-40
O-540-E4B52602700100/100LL8.50:1Same as -E4A5 but with impulse coupling magnetos with integral feed-thru capacitors-40
O-540-E4C52602700100/100LL8.50:1Same as -E4B5 but has -1200 series Magnetos-40
O-540-FLA52602800100/100LL8.50:1Same as -A~ except for special studs for front end mounting-40
O-540-F1B52602800100/100LL8.50:1Same as -F1A5 except for new style crankcase and Retard Breaker Magnetos-40
O-540-G1A52602700100/100LL8.50:1Similar to -E4C5 except has stiffer crankshaft and -A1D5 counterweights-40
O-540-G2A52602700100/100LL8.50:1Same as -G1A5 but does not have provision for controllable propeller-40
O-540-H1A52602700100/100LL8.50:1Similar to -G1A5 but has piston cooling oil jets and has -21 and -20 magnetos-40
O-540-H1A5D2602700100/100LL8.50:1Same as -H1A5 but equipped with D6LN-3000 impulse coupling dual magneto system along with the dual magneto accessory housing and related drive system-40
O-540-H1B5D2602700100/100LL8.50:1Same as -H1A5 but equipped with D6LN-3200 dual magneto system, dual magneto accessory housing, gear train and related drive system-40
O-540-H2A52602700100/100LL8.50:1Same as -H1A5 but with fixed pitch propeller-40
O-540-H2A5D2602700100/100LL8.50:1Same as -H2A5 but equipped with D6LN-3000 impulse coupling dual magneto system along with the dual magneto accessory housing and related drive system-40
O-540-H2B5D2602700100/100LL8.50:1Same as -H2A5 but equipped with D6LN-3200 dual magneto system, dual magneto accessory housing, gear train and related drive system-40
O-540-J1A5D2352400100/100LL8.50:1Similar to -A4A5 except for rating, speed, D6LN-3000 impulse coupling dual magneto and various items of weight reduction-40
O-540-J1B5D2352400100/100LL8.50:1Same as -J~D but with D6LN-3200 retard breaker dual magnetos-40
O-540-J1C5D2352400100/100LL8.50:1Same as -J1A5D but with rear mounted HA-6 horizontal carburetor-40
O-540-DD5D2352400100/100LL8.50:1Same as -J1C5D but with D6LN-3200 retard breaker dual magneto-40
O-540-J2A5D2352400100/100LL8.50:1Same as -J1A5D but with fixed pitch propeller-40
O-540-J2B5D2352400100/100LL8.50:1Same as -J1B5D but with fixed pitch propeller-40
O-540-J2C5D2352400100/100LL8.50:1Same as -J1C5D but with fixed pitch propeller-40
O-540-J2D5D2352400100/100LL8.50:1Same as -J11)5D but with fixed pitch propeller-40
O-540-J3A52352400100/100LL8.50:1Same as -J~D but has Slick 6251 (impulse coupling) and 6250 magnetos-40
O-540-J3A5D2352400100/100LL8.50:1Same as -J1A5D but has heavier counterweights for use with Hartzell extended hub controllable propeller-40
O-540-J3C5D2352400100/100LL8.50:1Same as -J1C5D but has heavier counterweights for use with McCauley controllable propeller-40
O-540-L3C5D2352400100/100LL8.50:1Similar to -J3C5D except for long reach spark plugs, high pressure fuel pump, piston cooling oil jet and turbocharger scavenge pump-40
IO-540-A1A52902575100/100LL8.70:1High compression tuned induction, Retard Breaker Magnetos, Bendix fuel injector-48
IO-540-B1A52902575100/100LL8.70:1Same as -A1A5 except for updraft exhaust cooling-48
IO-540-B1B52902575100/100LL8.70:1Same as -B1A5 except for Sunmonds fuel injector-48
IO-540-B1C52902575100/100LL8.70:1Same as -B1A5 except it has external servo bleed in fuel injection system-48
IO-540-C1B52502575100/100LL8.50:1Same as O-540-A1D5 but with Bendix fuel injector-48
IO-540-C1C52502575100/100LL8.50:1Same as -C1B5 but has AN fuel pump drive-48
IO-540-C2C2502575100/100LL8.50:1Conversion of O-540-A2B to Bendix fuel injection and AN fuel pump drive-48
IO-540-C4B52502575100/100LL8.50:1Same as -C1B5 but with more effective counterweights for use with Hartzell "compact,, propeller-48
IO-540-C4C52502575100/100LL8.50:1Same as -C4B5 but has AN fuel pump drive-48
IO-540-C4D52502575100/100LL8.50:1Same as -C4D5D except has two magnetos-48
IO-540-C4D5D2502575100/100LL8.50:1Same as -C4B5 but with D6LN-3000 impulse coupling magneto-48
IO-540-D4A52602700100/100LL8.50:1Same as O-540-E4A5 but with Bendix fuel injection-48
IO-540-D4B52602700100/100LL8.50:1Same as -D4A5 but has -1200 series impulse coupling magnetos-48
IO-540-D4C52602700100/100LL8.50:1Same as -D4B5 but with Retard Breaker Magnetos-48
IO-540-E1A52902575100/100LL8.70:1Same as -B1C5 but with piston cooling oil jets-48
IO-540-E1B52902575100/100LL8.70:1Same as -E1A5 but with -1200 series Magnetos-48
IO-540-E1C52902575100/100LL8.70:1Same as -E1B5 with RSA-10ED1 fuel injector-48
IO-540-G1A52902575100/100LL8.70:1Same as -A1A5 but with piston cooling oil jets-48
IO-540-G1B52902575100/100LL8.70:1Similar to -G1A5 but has -1200 series Magnetos and RSA-10ED1 fuel injector-48
IO-540-G1C52902575100/100LL8.70:1Same as -G1B5 but has impulse magnetos and 38-1/2" injector adapter-48
IO-540-G1D52902575100/100LL8.70:1Same as -G1C5 but has straight injeecor inlet-48
IO-540-G1E52902575100/100LL8.70:1Same as -G1A5 but has -1200 series Magnetos-48
IO-540-G1F52902575100/100LL8.70:1Same as -G1E5 but with (2) impulse coupling Magnetos-48
IO-540-J4A52502575100/100LL8.50:1Same as -C4B5 except comersion for use with turbo- charger, long reach spark plugs, piston cooling oil jets, AN fuel pump drive, vented fuel nozzles and -1200 series Magnetos-48
IO-540-K1A53002700100/100LL8.70:1Similar to -G1A5 but has -1200 series Magnetos, RSA-10ED1 injector, large crankshaft and 38-1/2_ fuel injector adapter-48
IO-540-K1A5D3002700100/100LL8.70:1Same as -K1A5 but with D6LN-3000 impulse coupling dual magneto-48
IO-540-K1B53002700100/100LL8.70:1Similar to -KIA5 but has two impulse coupling magnetos and straight injector adapter-48
IO-540-K1BSD3002700100/100LL8.70:1Same as -K1B5 but with D6LN-3000 impulse coupling dual magneto-48
IO-540-K1C5300/
290		2700/
2575		100/100LL8.70:1Similar to -G1A5 but has -K1A5 rotating system-48
IO-540-K1D53002700100/100LL8.70:1Same as -K1A5 but has -200 series Magnetos, flange fuel injector and straight injector inlet-48
IO-540-K1E53002700100/100LL8.70:1Similar to -K1C5 but has -1200 series impulse Magnetos-48
IO-540-K1E5D3002700100/100LL8.70:1Same as -K1E5 but with D6LN-3000 impulse coupling dual magneto-48
IO-540-K1F5300/
290		2700/
2575		100/100LL8.70:1Same as -G1B5 but with IO-540-K series rotating system-48
IO-540-K1F5D3002700100/100LL8.70:1Same as -K1F5 but with D6LN-3200 retard breaker dual magneto-48
IO-540-K1G53002700100/100LL8.70:1Same as -K1A5 but has diaphragm type fuel pump and drive-48
IO-540-K1G5D3002700100/100LL8.70:1Same as -K1A5D but has diaphragm type fuel pump and drive-48
IO-540-K1H53002700100/100LL8.70:1Same as -K1B5 but has diaphragm type fuel pump and drive-48
IO-540-KU53002700100/100LL8.70:1Same as -K1F5 but has diaphragm type fuel pump and drive-48
IO-540-KU5D30027001O0/100LL8.70:1Same as -K1F5D but has diaphragm type fuel pump and drive-48
IO-540-K1K53002700100/100LL8.70:1Similar to -K1A5 except modified for use with an Aerobatic kit-48
IO-540-K2A53002700100/100LL8.70:1Same as -K1A5 except has different propeller bushings-48
IO-540-L1A53002700100/100LL8.70:1Similar to -K1A5 but with front air inlet and Retard Magnetos-48
IO-540-L1A5D3002700100/100LL8.70:1Same as -L1A5 but with D6LN-3000 impulse coupling dual magneto-48
IO-540-L1B5D3002700100/100LL8.70:1Similar to -L1A5D except for a modified oil sump-48
IO-540-L1C53002700100/100LL8.70:1Same as -L1A5 but has diaphragm type fuel pump and drive-48
IO-540-M1A53002700100/100LL8.70:1Similar to -K1A5 but has Retard Magnetos and up exhaust heads-48
IO-540-M1A5D3002700100/100LL8.70:1Same as -M1A5 but with D6LN-3200 Retard Breaker dual magneto-48
IO-540-M1B5D3002700100/100LL8.70:1Similar to -M1A5D but with RSA-10ED1 fuel injector, automotive type fuel pump, D6LN-3000 impulse coupling magneto and straight fuel injection adapter-48
IO-540-M1C53002700100/100LL8.70:1Same as -M1A5 except has impulse magneto-48
IO-540-M2A5D3002700100/100LL8.70:1Similar to -M1A5 but has D6LN-3200 Retard Breaker dual magneto and provision for fixed pitch propeller-48
IO-540-N1A52602700100/100LL8.50:1Similar to -D4A5 but with O-540-G1A5 crankcase and crankshaft and -K1A5 counterweight assembly-48
IO-540-P1A52902575100/100LL8.70:1Same as -G1B5 but has larger oil pump and is s usable for turbocharging-48
IO-540-R1A52602700100/100LL8.50:1Similar to -N1A5 except converted for use with turbocharger long reach spark plugs. Piston cooling oil jets, AN fuel pump, vented fuel nozzles and -1200 series magnetos-48
IO-540-S1A5300/
290		2700/
2575		100/100LL8.70:1Same as -P1A5 but with IO-540-K series rotating system-48
IO-540-T4A5D2602700100/100LL8.50:1Similar to -D4B5 but has D6LN-3000 impulse coupling dual magneto and horizontal rear inlet fuel injector-48
IO-540-T4B52602700100/100LL8.70:1Same as -T4B5D except has two Slick Magnetos-48
IO-540-T4B5D2602700100/100LL8.50:1Identical to -T4A5D except for fuel drain boss location -48
IO-540-T4C5D2602700100/100LL8.50:1Same as -T4B5D but has Bendix D6LN-3200 retard breaker magneto-48
IO-540-U1A5D3002700100/100LL8.70:1Same as -L1A5 but with up-exhaust cylinder heads and D6LN-3000 impulse coupling dual magneto-48
IO-540-U1B5D3002700100/100LL8.70:1Same as -U1A5D but has diaphragm type fuel pump and drive-48
IO-540-V4A5D2602700100/100LL8.50:1Same as -T4B5D except for front mounted fuel injector-48
IO-540-W1A52352700100/100LL8.70:1Same as -W1A5D except has two Slick Magnetos-48
IO-540-W1A5D2352400100/100LL8.50:1Similar to O-540-J1A5D except that it is equipped with IO-540-V4A5D sump, intake pipes and fuel injection system-48
IO-540-W3A5D2352400100/100LL8.50:1Same as -W1A5D but has heavier counterweights for use with Hartzell propeller-48
IO-540-AA1A52502425100/100LL7.30:1Similar to -S1A5 except for compression ratio-48
IO-540-AA1B52702700100/100LL7.30:1Same as -AA1A5 except has impulse magneto and higher rating-48
VO-540-A1A3053300807.30:1Low compression vertical PS-7BD carburetor-43
VO-540-A2A3053300807.30:1Same as -A1A but with spring coupling accessory drive-43
VO-540-B1A3053200807.30:1Same as -A1A except MA-6-AA carburetor-43
VO-540-B1B3053200807.30:1Same as -B1A except for Retard Breaker Magnetos and less fuel pump drive and hydraulic pump drive-43
VO-540-B1B33053200807.30:1Same as -BIB except for six 3rd order counterweights-43
VO-540-B1C3053200807.30:1Same as -B1A except for Retard Breaker Magnetos-43
VO-540-B1D3053200807.30:1Same as -B1C except for two MA-6-AA carburetors-43
VO-540-B1E3053200807.30:1Retrofit kit of -B1A with two MA-6-AA carburetors-43
VO-540-B1F3053200807.30:1Same as -BIB but has fuel and hydraulic pump drives-43
VO-540-B1H33053200807.30:1Same as -B1B3 but with -1200 series Magnetos-43
VO-540-B2A3053200807.30:1Same as -B1A but with spring coupling accessory drive-43
VO-540-B2C3053200807.30:1Same as -B1C but with spr~ng coupling accessory drive-43
VO-540-B2D3053200807.30:1Same as -BID but with sprmg coupling accessory drive-43
VO-540-B2E3053200807.30:1Same as -B1E but with spring coupling accessory drive-43
VO-540-B2G3053200807.30:1Same as -B2D but with -1200 series Magnetos-43
VO-540-C1A3153200100/100LL8.70:1High compression altitude engine with two (2) MA-6-AA carburetors, retard breaker magnetos. Same as -B1D except for compression ratio and power-43
VO-540-C1B3153200100/100LL8.70:1Retrofit kit of -B1E with high compression piston and higher power-43
VO-540-C1C33053200100/100LL8.70:1Same as -B1B3 except it has high compression pistons and two MA-6-AA carburetors-43
VO-540-C2A3153200100/100LL8.70:1Same as -CIA but with spring coupling accessory drive-43
VO-540-C2B3153200100/100LL8.70:1Same as -C1B but with spring coupling accessory drive-43
VO-540-C2C3153200100/100LL8.70:1Same as -C2A except for -1200 series magnetos-43
O-540-9,-9A3053200100/100LL 8.70:1Military version of VO-540-C2A-43
HIO-540-A1A2902575100/100LL8.70:1Similar to IO-540-K1A5 but has lower rating and speed, no provision for propeller governor and has front mounting pads machined and studded-48
IGO-540-A1A3503400100/100LL8.70:1High compression tuned induction, Retard Breaker Magnetos, Bendix fuel injector-49
IGO-540-A1B3503400100/100LL8.70:1Same as -A1A except for low tension ignition system-49
IGO-540-A1C3503400100/100LL8.70:1Similar to -A1A but equipped with RSA-10DB1 fuel injector, RG-9080-J7 fuel pump, S6RN-1208 and -1209 magnetos and a Prestolite 24V-100A AN drive alternator-49
IGO-540-B1A3503400100/100LL8.70:1Same as -A1A except for updraft exhaust cooling-49
IGO-540-B1B3503400100/100LL8.70:1Same as -B1A except for low tension ignition system-49
IGO-540-B1C3503400100/100LL8.70:1Same as -BM except it has extemal sewo bleed in fuel injection system-49
IVO-540-A1A3053200100/100LL8.70:1Similar to VO-540-C1A but has Bendix RS10-AD1 fuel injector-60
TIO-540-A1A3102575100/100LL7.30:1Similar to IO-540-ELA5 but has turbocharger (TE0659) RSA-10-AD1 fuel injector and -1200 series Magnetos-61
TIO-540-A1B3102575100/100LL7.30:1Same as -A1A but has density controller with faster temperature response-61
TIO-540-A1C3102575100/100LL7.30:1Similar to -A1B but has revised controller setting-61
TIO-540-C1A2502575100/100LL7.20:1IO-540-J4A5 equipped with TE0659 turbocharger and low compression pistons-61
TIO-540-E1A2602575100/100LL7.20:1Same as -CIA but has higher rating and impulse coupling magneto-61
TIO-540-G1A2502575100/100LL8.50:1Same as -CIA but high compression-61
TIO-540-H1A2702575100/100LL7.20:1Same as -ETA except for horsepower setting-61
TIO-540-K1AD2502575100/100LL8.00:1Similar to -CIA but with D6LN-3200 retard breaker dual magneto, pressure controller, provision for cabin pressurization, rear mounted fuel injector, turbocharger mounted to rear of engine and higher C.R.-61
TIO-540-S1AD3002700100/100LL7.30:1Similar to IO-540-M2AD with front air inlet, provision for controllable propeller, a manually controlled TE0659 turbocharger and D6LN-3000 impulse coupling magneto-61
TIO-540-AA1AD2702575100/100LL8.00:1Similar to -K1AD but has a different controller system and has provision for a rear mounted propeller governor-61
TIO-540-AB1AD2502575100/100LL8.00:1Same as -AA1AD but has bottom mounted fuel injector, a relocated turbocharger and a D6LN-3000 impulse coupling magneto-61
TIO-540-AB1BD2502575100/100LL8.00:1Similar to -AB1AD except has propeller governor mounted on the accessory housing and the turbo scavenger pump moved to the vacuum pump pad and more effective counterweights for McCauley propeller -61
TIO-540-AF1A2702575100/100LL8.00:1Similar to -AA1AD but has Slick magnetos, different turbocharger and an intercooler-61
TIO-540-A2A3102575100/100LL7.30:1Same as -A1A but with propeller flange bushings for 3-blade propeller-61
TIO-540-A2B3102575100/100LL7.30:1Same as -A1B but with propeller flange bushings for 3-blade propeller-61
TIO-540-A2C3102575100/100LL7.30:1Same as -A1C but with propeller flange bushings for 3-blade propeller-61
TIO-540-F2BD3252575100/100LL7.30:1Similar to -A2B but incorporates D6LN-3200 retard breaker dual magneto system-61
TIO-540-J2B3502575100/100LL7.30:1Same as -J2BD but has S6LN-1208 (Retard Breaker) and S6LN-1209 magnetos-61
TIO-540-J2BD3502575100/100LL7.30:1Similar to -F2BD except equipped with TH08A60 turbocharger-61
TIO-540-N2BD3502575100/100LL7.30:1Identical to -J2BD except turbocharger shifted one-half inch to the left -61
TIO-540-R2AD350/
340		2575/
2500		100/100LL7.30:1Similar to -J2BD except has provision for cabin bleed and has a variable pressure controller-61
TIO-540-T2AD3302400100/100LL7.30:1Same as -J2BD except for a modified exhaust transition and lower rating-61
TIO-540-U2A3502500100/100LL7.30:1Similar to IO-~0-~5 but with intercooler and customer supplied turbocharger system-61
TIO-540-V2AD3602600100/100LL7.30:1Similar to -J2BD except with an intercooler and a change in cylinder head design-61
TIO-540-W2A3602600100/100LL7.30:1Similar to -V2AD but with Slick 6261 (imp. coupling) and 6260 pressurized magnetos, a different controller system and without either induction air cooler or cabin bleed-61
TIO-540-AE2A3502500100/100LL7.30:1Similar to -U2A but has (2) Garrett instead of Roto-Master turbochargers, (2) intercoolers, (1) wastegate and Slick magnetos-61
AEIO-540-D4A52602700100/100LL8.50:1Same as IO-540-D4A5 but is equipped with Aerobatic kit-48
AEIO-540-D4B52602700100/100LL8.50:1Same as IO-540-D4B5 but is equipped with Aerobatic kit-48
AEIO-540-D4C52602700100/100LL8.50:1Same as IO-540-D4C5 but is equipped with Aerobatic kit-48
AEIO-540-L1B53002700100/100LL8.70:1Same as -L1B5D but has Slick 6251 (impulse coupling) and 6250 magnetos-48
AEIO-540-L1B5D3002700100/100LL8.70:1Same as IO-540-L1B5D but is equipped with Aerobatic kit-48
IGSO-540-ALA3803400100/100LL7.30:1Supercharged Bendix fuel injector, dry sump, cross-wise accessones high altitude magnetos-50
IGSO-540-A1C3803400100/100LL7.30:1Same as -AL: but with honzontal air inlet housing and has external servo bleed in fuel injection system-50
IGSO-540-A1D3803400100/100LL7.30:1Same as -A1A but has -1200 series Magnetos-50
IGSO-540-A1E3803400100/100LL7.30:1Same as -A1C but has -1200 series Magnetos and no vent flow restriction-50
IGSO-540-A1F3803400100/100LL7.30:1Same as -AID but with fuel flow modulator removed-50
IGSO-540-A1H3803400100/100LL7.30:1Same as -ATE but with fuel flow modulator removed-50
IGSO-540-BLA3803400100/100LL7.30:1Same as -ALA except for updraft exhaust cooling and Simmonds fuel injector-50
IGSO-540-B1C3803400100/100LL7.30:1Same as -B1A but has -1200 series Magnetos-50
LTIO-540-K1AD2502575100/100LL8.00:1Similar to TIO-540-K1AD but has left hand rotation crankshaft-68
LTIO-540-F2BD3252575100/100LL7.30:1Same as TIO-540-F2BD but has reverse rotation-68
LTIO-540-J2B3502575100/100LL7.30:1Same as -J2BD but have S6RN-1208 (Retard Breaker) and S6RN-12O9 magnetos-68
LTIO-540-J2BD3502575100/100LL7.30:1Same as TIO-540-J2BD but has reverse rotation-68
LTIO-540-N2BD3502575100/100LL7.30:1Similar to TIO-540-N2BD but has left hand rotation crankshaft-68
LTIO-540-R2AD350/
340		2575/
2500		100/100LL7.30:1Similar to TIO-540-R2AD but has left hand rotation crankshaft-68
LTIO-540-U2A3502500100/100LL7.30:1Same as TIO-540-U2A but has reverse rotation-68
LTIO-540-V2AD3602600100/100LL7.30:1Same as TIO-540-V2AD but has reverse rotation-68
LTIO-540-W2A3602600100/100LL7.30:1Same as TIO-540-W2A but has left hand rotation crankshaft-68
TIVO-540-A2A3153200100/100LL7.30:114,000 feet at 3200 RPM, turbocharger Bendix fuel injection vertical helicopter engine with spring coupling accessory drive-57
ModelHPT/O
RPM		FuelC.R.DESCRIPTIONSuffix
TIO-541-A1A3102575100/100LL7.30:1Turbocharger (T-1823), fuel injected (RSA-10-ADV, crosswise accessories, integral accessory section, wet sump-59
TIO-541-E3802900100/100LL730:1Similar to -A1A but has compressor drive, larger redesigned cylinder head, RSA-10DB1 injector and higher rating-59
TIO-541-E1B43802900100/100LL7.30:1Same as -E~4 but has no provision for cabin pressurization-59
TIO-541-E1C43802900100/100LL7.30:1Same as -E1A4 but has 1~1879 turbocharger-59
TIO-541-E1D43802900100/100LL7.30:1Same as -E1B4 but has 1~1879 turbocharger-59
TIGO-541-D1A4503200100/100LL7.30:1Turbocharged (T18A21), fuel injected (RSA-l0-DBl), offset reduction gear, torquemeter, crosswise accessories, integral accessory section, wet sump-62
TIGO-541-D1B4503200100/100LL7.30:1Similar to -D1A but with integral wastegate turbocharger and low drag cylinder heads-62
TIGO-541-E1A4253200100/100LL7.30:1Same as -D1A except for rating-62
TIGO-541-GLAD4503200100/100LL7.30:1Similar to -D1A but has D6RN-3200 retard breaker dual magneto and intercooler and fuel head enrichment fuel injector-62

PISTON - (8) EIGHT CYLINDER SERIES

ModelHPT/O
RPM		FuelC.R.DESCRIPTIONSuffix
IO-720-A1A4002650100/100LL8.70:1High compression tuned induction, Bendix fuel injector and AN fuel pump drive-54
IO-720-A1B4002650100/100LL8.70:1Same as -A~ but equipped with S8LN-1208 and -1209 Magnetos-54
IO-720-A1BD4002650100/100LL8.70:1Same as -A1B but with D8LN-3200 Retard Breaker dual magneto-54
IO-720-B1A4002650100/100LL8.70:1Same as -AIA but with updraft exhaust cooling and rear air inlet-54
IO-720-B1B4002650100/100LL8.70:1Same as -B1A but equipped with S8LN-1208 and -1209 Magnetos-54
IO-720-B1BD4002650100/100LL8.70:1Same as -B1B but with D8LN-3200 Retard Breaker dual Magneto-54
IO-720-C1B4002650100/100LL8.70:1Same as -B1B but has up-exhaust cylinder heads-54
IO-720-C1BD4002650100/100LL8.70:1Same as -C1B but with D8LN-3200 Retard Breaker dual Magneto-54
IO-720-D1B400/
375		2650/
2500		100/100LL8.70:1Similar to -A1B but has rear air inlet-54
IO-720-D1BD400/
375		2650/
2500		100/100LL8.70:1Same as -D1B but with D8LN-3200 Retard Breaker dual Magneto-54
IO-720-D1C400/
375		2650/
2500		100/100LL8.70:1Same as -D1B but has 38-1/2_ fuel injector adapter-54
IO-720-D1CD400/
375		2650/
2500		100/100LL8.70:1Same as -D1C but with D8LN-3200 Retard Breaker dual 2500 magnetos-54
 

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