Lycoming O-435 Explained

The Lycoming O-435 is an American six-cylinder, horizontally opposed fixed-wing aircraft and helicopter engine made by Lycoming Engines. The engine is a six-cylinder version of the four-cylinder Lycoming O-290.

Design and development

The powerplant is a horizontally opposed Lycoming six-cylinder design. It is a direct-drive or geared, air-cooled, and normally aspirated engine. The cylinders have steel barrels with aluminum heads, and the valves are operated by hydraulic lifters. The crankshaft is supported in an aluminum-alloy split case by four main bearings and one ball-thrust bearing, and lubricating oil is supplied from a 12 quart wet sump. The camshaft rides in journals that do not employ bearing inserts. The accessory housing supports two magnetos, a starter, a generator, and a dual tach drive. A spare mounting pad is included for a vacuum pump.[1] [2] [3] [4]

Variants

All engines have an additional prefix preceding the 435 to indicate the specific configuration of the engine. There are also numerous engine suffixes, denoting different accessories such as different manufacturers' carburetors, or different magnetos.[1] [2]

O-435 models

O-435
  • Baseline engine model, producing 1750NaN0 at 2300 rpm, with a compression ratio of 6.25:1, a dry weight of 3470NaN0 and fitted with a Marvel MA-4 carburetor. Type certified on February 11, 1942.[1]
    O-435-A
  • Engine model with provisions for automotive type accessories, producing 1900NaN0 at 2550 rpm, with a compression ratio of 6.5:1, a dry weight of 3480NaN0 with a -8 magneto and 3420NaN0 with a -20 magneto and fitted with a Marvel MA-4-5 or PS-5C carburetor. Type certified on February 11, 1942.[1]
    O-435-A2
  • Engine model with a redesigned improved crankcase, cylinders, valves and valve seats, exhaust valve guides and rocker shaft bushing. It also has provisions for automotive-type accessories. It produced 2250NaN0 at 3000 rpm, with a compression ratio of 7.5:1, a dry weight of 3650NaN0 and fitted with a Marvel MA-4-5 carburetor. Type certified on October 19, 1949 and cancelled on February 25, 1944.[1]
    O-435-A3
  • Type certified on January 5, 1951 and cancelled on February 8, 1955.[1]
    O-435-B (military designation O-435-5)
  • Engine model with provisions for AN type accessories, producing 2350NaN0 at 3000 rpm, with a compression ratio of 7.5:1, a dry weight of 3620NaN0 and fitted with a Marvel MA-4-5 carburetor. Type certified on October 7, 1943 and cancelled on November 2, 1950.[1]
    O-435-C (military designation O-435-1)
  • Engine model with provisions for AN type accessories, producing 1750NaN0 at 2300 rpm, with a compression ratio of 6.25:1, a dry weight of 3560NaN0 and fitted with a Marvel MA-4SPA carburetor. Type certified on January 11, 1943.[1]
    O-435-C1 (military designation O-435-11)
  • Engine model, with revised type valves, valve guides, an accessory case with generator and starter drive, producing 1750NaN0 at 2300 rpm, with a compression ratio of 6.25:1, a dry weight of 3660NaN0 and fitted with a Marvel MA-4 carburetor. Type certified on January 2, 1948.[1]
    O-435-C2 (military designation O-435-13)
  • Engine model, with provisions for O-435-C accessories carburetor, producing 1750NaN0 at 2300 rpm, with a compression ratio of 6.25:1, a dry weight of 3680NaN0 and fitted with a Marvel MA-4SPA carburetor. Type certified on January 2, 1948.[1]
    O-435-K
  • Engine model that incorporates a GO-435-C2 accessory case and crankcase. It produces 2400NaN0 at 3000 rpm, with a compression ratio of 7.3:1, a dry weight of 4050NaN0 and fitted with a Marvel MA-4-5 carburetor. Type certified on January 24, 1951.[1]
    O-435-K1 (military designation O-435-4)
  • Engine model with increased maximum continuous rating and the generator pad omitted, approved for helicopter installations. It produces 2500NaN0 at 3000 rpm, with a compression ratio of 7.3:1, a dry weight of 4050NaN0 and fitted with a Marvel MA-4-5 carburetor. Type certified on March 30, 1951.[1]
    O-435-2
  • Military engine model.[4]
    O-435-2-M1
  • Civil modified military engine model, by the Associated Aircraft Modification Company, with Bendix PS-5C carburetor with 380123-1 setting. It produces 2350NaN0 at 3200 rpm, with a compression ratio of 7.5:1, a dry weight of 4050NaN0. Only military O-435-2 engines with serial numbers L00849-11 through L-1117-11 are eligible for this modification.[4]

    GO-435 models

    GO-435
  • Baseline geared engine model. It incorporates six 3rd-order crankshaft torsional vibration dampers and reduction gearing. It produced 2100NaN0 at 3000 rpm, with a compression ratio of 6.25:1, a dry weight of 4070NaN0 and fitted with a Marvel MA-4-5 carburetor. Type certified on August 30, 1944 and cancelled on November 2, 1950.[1]
    GO-435-A2
  • Type certified on October 19, 1949 and cancelled on February 8, 1955.[1]
    GO-435-C2 (military designation O-435-17)
  • Geared engine model which incorporates an improved crankcase and cylinder assembly. It produces 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4220NaN0 and fitted with a Marvel MA-4-5 or PS-5BD carburetor. Type certified on October 19, 1949.[1]
    GO-435-C2A
  • Geared engine model, incorporates S6LN-20 or -21 magnetos, producing 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4380NaN0 and fitted with a Marvel MA-4-5 or PS-5BD carburetor. Type certified on January 2, 1951, cancelled on February 8, 1955 and reinstated July 15, 1955.[1]
    GO-435-C2A2
  • Geared engine model, with a dry sump and without provisions for a hydraulic propeller control or governor, producing 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4320NaN0 and fitted with a Marvel MA-4-5 or PS-5BD carburetor. Type certified on October 24, 1957.[1]
    GO-435-C2B
  • Geared engine model with provisions for a hydraulic propeller and governor. It produces 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4300NaN0 and fitted with a Marvel MA-4-5 or PS-5BD carburetor. Type certified on November 6, 1952.[1]
    GO-435-C2B1
  • Geared engine model which incorporates a dual generator and vacuum pump drive. It produces 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4300NaN0 and fitted with a Marvel MA-4-5 or PS-5BD carburetor. Type certified on February 8, 1955.[1]
    GO-435-C2B2
  • Geared engine model with S6LN-20, or -21 magnetos. It produces 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4300NaN0 and fitted with a Marvel MA-4-5 or PS-5BD carburetor. Type certified on February 28, 1956.[1]
    GO-435-C2C
  • Geared engine model producing 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4220NaN0 and fitted with a Marvel MA-4-5 or PS-5BD carburetor. Type certified on November 24, 1953 and cancelled on July 5, 1956.[1]
    GO-435-C2D
  • Geared engine model producing 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4200NaN0 and fitted with a Marvel MA-4-5 or PS-5BD carburetor. Type certified on July 20, 1954 and cancelled on July 5, 1956.[1]
    GO-435-C2E
  • Geared engine model with S6LN-20, or -21 magnetos. It produces 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4200NaN0 and fitted with a Marvel MA-4-5 or PS-5BD carburetor. Type certified on September 27, 1956.[1]
    GO-435-D1
  • Geared engine model with a dry sump oil system and crosswise accessory drives. It produces 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1 and fitted with a Marvel MA-4-5 or PS-5BD carburetor. Type certified on September 25, 1953.[1]

    VO-435 models

    VO-435
  • Base model, vertically-mounted engine for helicopters, with a dry sump oil system and side-mounted AN type accessory drives. It produces 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 3960NaN0 and fitted with a Marvel MA-4-5 or MA-4-5AA carburetor. Type certified on October 11, 1954. Was re-designated as VO-435-A1A.[2]
    VO-435-A1A (military designation O-435-21)
  • Vertically-mounted engine model for helicopters, with a dry sump oil system and side-mounted AN type accessory drives. It produces 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 3960NaN0 and fitted with a Marvel MA-4-5 or MA-4-5AA carburetor. Type certified on October 29, 1954. Re-designated from VO-435.[2]
    VO-435-A1B (military designation O-435-6)
  • Vertically-mounted engine model for helicopters, with a dry sump oil system and a modified accessory section. It produces 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 3910NaN0 and fitted with a Marvel MA-4-5 or MA-4-5AA carburetor. Type certified on June 10, 1955.[2]
    VO-435-A1C (military designations O-435-23, O-435-23A O-435-23B and O-435-23C)
  • Vertically-mounted engine model for helicopters, with a dry sump oil system, which incorporates a crankcase and oil sump modification giving increased strength and an oil pump housing which is machined for a hydraulic pump drive. It produces 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 3990NaN0 and fitted with a Marvel MA-4-5 or MA-4-5AA carburetor. Type certified on July 18, 1954.[2]
    VO-435-A1D (military designation O-435-6A)
  • Vertically-mounted engine model for helicopters, with a dry sump oil system, with crankcase and oil sump modifications for increased strength. It produces 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 3900NaN0 and fitted with a Marvel MA-4-5 or MA-4-5AA carburetor. Type certified on September 27, 1956.[2]
    VO-435-A1E
  • Vertically-mounted engine model for helicopters, with a dry sump oil system and 6RN-200 or S6LN-204 magnetos. It produces 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 3920NaN0 and fitted with a Marvel MA-4-5AA carburetor. Type certified on October 15, 1959.[2]
    VO-435-A1F
  • Vertically-mounted engine model for helicopters, with a dry sump oil system. It has internal piston cooling oil jets and heavy duty cylinders and may be converted to a model TVO-435-A1A. It produces 2600NaN0 at 3400 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 3990NaN0 and fitted with a Marvel MA-4-5AA carburetor. Type certified on March 6, 1961.[2]
    VO-435-B1A
  • Vertically-mounted engine model for helicopters, with a redesigned accessory drive section, a wet oil sump and a higher compression ratio. It produces 2650NaN0 at 3200 rpm for takeoff, with a compression ratio of 8.7:1, a dry weight of 4190NaN0 and fitted with a Marvel MA-4-5AA carburetor. Type certified on December 15, 1965.[2]
    TVO-435-A1A
  • Turbocharged, vertically-mounted engine model for helicopters, with a dry sump oil system. It produces 2600NaN0 at 3200 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4680NaN0 and fitted with a Marvel-Schebler MA-6AA carburetor. Type certified on May 12, 1961.[3]

    TVO-435 models

    TVO-435-A1A
  • Turbocharged, vertically-mounted engine model for helicopters, with a dry sump oil system. It produces 2600NaN0 at 3200 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4680NaN0 and fitted with a Marvel-Schebler MA-6AA carburetor. Type certified on May 12, 1961.[3]
    TVO-435-B1A (military designation O-435-25A)
  • Turbocharged, vertically-mounted engine model with internal piston cooling oil jets, for helicopters, with a dry sump oil system and cylinder assemblies machined for long-reach spark plugs. It produces 2700NaN0 at 3200 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4780NaN0 and fitted with a Marvel-Schebler MA-6AA carburetor. Type certified on November 21, 1962.[3]
    TVO-435-B1B
  • Turbocharged, vertically-mounted engine model for helicopters, with a dry sump oil system and TCM (formerly Bendix) S6RN-1208 and S6LN-1209 magnetos. It produces 2700NaN0 at 3200 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4790NaN0 and fitted with a Marvel-Schebler MA-6AA carburetor. Type certified on June 20, 1966.[3]
    TVO-435-C1A
  • Turbocharged, vertically-mounted engine model for helicopters, with a dry sump oil system and a T-1112 turbosupercharger. It produces 3800NaN0 at 3200 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4780NaN0 and fitted with a Marvel-Schebler MA-6AA carburetor. Type certified on November 21, 1962.[3]
    TVO-435-D1A
  • Turbocharged, vertically-mounted engine model for helicopters, with a dry sump oil system. It has a TK-0659 turbocharger and TCM (formerly Bendix) S6RN-1208 (retarded breaker) and S6LN-1209 magnetos. It produces 2700NaN0 at 3200 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4650NaN0 and fitted with a Marvel-Schebler MA-6AA carburetor. Type certified on March 10, 1966.[3]
    TVO-435-D1B
  • Turbocharged, vertically-mounted engine model for helicopters, with a dry sump oil system. It has TCM (formerly Bendix) S-200 series magnetos. It produces 2700NaN0 at 3200 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4640NaN0 and fitted with a Marvel-Schebler MA-6AA carburetor. Type certified on February 23, 1967.[3]
    TVO-435-E1A
  • Turbocharged, vertically-mounted engine model for helicopters, with a dry sump oil system and a Kelly Aerospace (formerly AiResearch) TK-0659 turbocharger. It produces 2600NaN0 at 3200 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4900NaN0 and fitted with a Marvel-Schebler MA-6AA carburetor. Type certified on March 7, 1967.[3]
    TVO-435-F1A
  • Turbocharged, vertically-mounted engine model for helicopters, with a wet sump oil system, different accessory section and a higher power rating. It produces 2800NaN0 at 3200 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4900NaN0 and fitted with a Marvel-Schebler MA-6AA carburetor. Type certified on January 22, 1968.[3]
    TVO-435-G1A
  • Turbocharged, vertically-mounted engine model for helicopters, with a dry sump oil system and a different automatic waste gate control setting for a higher power rating. It produces 2800NaN0 at 3200 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4650NaN0 and fitted with a Marvel-Schebler MA-6AA carburetor. Type certified on January 11, 1968.[3]
    TVO-435-G1B
  • Turbocharged, vertically-mounted engine model for helicopters, with a dry sump oil system and different magnetos. It produces 2800NaN0 at 3200 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4640NaN0 and fitted with a Marvel-Schebler MA-6AA carburetor. Type certified on November 25, 1968.[3]
    TVO-435-25
  • Turbocharged, vertically-mounted military engine model for helicopters, with a dry sump oil system. This military model is similar to the -A1A, except it has cylinder assemblies from the -B1A. It produces 2600NaN0 at 3200 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 4930NaN0 and fitted with a Marvel-Schebler MA-6AA carburetor. Type certified on June 10, 1963.[3]

    Applications

    Aircraft
  • Other

    • References

    Bibliography

    Notes and References

    1. Web site: Type Certificate Data Sheet No. E-228 Revision 17. September 2, 2022. Federal Aviation Administration. Federal Aviation Administration. June 23, 2010. https://web.archive.org/web/20161216184617/https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/4063ef6ed938238e862577cf0054c9e4/$FILE/E-228%20Rev%2017.pdf. December 16, 2016. live.
    2. Web site: Type Certificate Data Sheet No. E-279 Revision 10. September 2, 2022. Federal Aviation Administration. Federal Aviation Administration. November 4, 2010. https://web.archive.org/web/20161220044829/https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/ad3f762c953c59408625780e005c84a1/$FILE/E-279%20Rev%2010.pdf. December 20, 2016. live.
    3. Web site: Type Certificate Data Sheet No. 1E13 Revision 8. September 2, 2022. Federal Aviation Administration. Federal Aviation Administration. November 4, 2010. https://web.archive.org/web/20210411170630/https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/55a4c5618bc4654f8625780e00596064/$FILE/1E13%20Rev%208%20.pdf. April 11, 2021. live.
    4. Web site: Type Certificate Data Sheet No. 5E-12. September 2, 2022. Federal Aviation Administration. Federal Aviation Administration. https://web.archive.org/web/20220902180724/https://rgl.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/0/88a3c7d6485bc4fa8625681d006a3381/$FILE/5E-12.pdf. September 2, 2022. live.

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