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.

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.

O-435 models

GO-435 models

VO-435 models

TVO-435 models

Applications

• Aero Commander 500 • AISA I-115 • Beechcraft Bonanza, • Bell 47 • Bell H-13 Sioux • Bellanca Cruisemaster • Boisavia Mercurey • D'Apuzzo Senior Aero Sport • de Havilland Canada Super Chipmunk • Fleetwings BQ-2 • Fleetwings PQ-12 • Fokker F.25 • Fokker S-11 • Helio Courier • Hiller OH-23 Raven • Interstate TDR • Jeffair Barracuda • Kaman K-190A • Kaman K-225 • Karhumäki Karhu • Kawasaki KH-4 • LIBIS KB-11 • Miles Aerovan • Piaggio P.148 • Piaggio P.149 • Pilatus P-4 • Ra-Son Warrior • Ryan Navion • Saab 91 Safir • Stinson 108 • Stinson L-5 Sentinel • St Croix Sopwith Triplane • UTVA Aero 3 • UTVA 56 • Vertical Hummingbird

Specifications (O-435-D)