Lycoming O-435

The Lycoming O-435 is a 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.

O-435
A Lycoming TVO-435 from a Bell 47G
Type Piston tank and aircraft engine
National origin United States
Manufacturer Lycoming Engines
First run 1939
Major applications M22 Locust
Bell 47
Produced 1942–1975 out of production
Developed from 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.

XO-435-1
XO-435-3
(GO-435)
O-435-5
(O-435-B)
O-435-7
(O-435-B1)
O-435-9
O-435-11
O-435-13
O-435-A
O-435-B
O-435-C
O-435-D
GO-435
GO-435-B
TVO-435-A

Applications

Aircraft
Other

Specifications (O-435-D)

Data from Jane's.[1]

General characteristics

  • Type: Six-cylinder horizontally-opposed gasoline piston engine
  • Bore: 4.875 in (123.7 mm)
  • Stroke: 3.875 in (98.4 mm)
  • Displacement: 434 cu in (7.1 L)
  • Width: 33.5 in (824 cm)
  • Height: 43.5 in (1,105 cm)
  • Dry weight: 433 lb (196.6 kg)

Components

  • Valvetrain: Overhead valve (OHV, pushrod actuated), one inlet and one exhaust valve per cylinder
  • Fuel system: Marvel-Schebler carburetor
  • Fuel type: 100 octane gasoline
  • Oil system: Pressure pump type
  • Cooling system: Air-cooled by fan (helicopter installations)
  • Reduction gear: Direct-drive

Performance

See also

Related development

Comparable engines

Related lists

References

Notes
  1. Bridgman 1994, p. 78d.
Bibliography
  • Bridgman, Leonard. Jane's All the World's Aircraft 1945-46. Hammersmith, London: HarperCollinsPublishers (1994 reprint). ISBN 000 470831-8
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