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The Lycoming O-320 is a large family of naturally aspirated, 320 cu in (5.2 L) air-cooled, horizontally-opposed four-cylinder, direct-drive engines produced by Lycoming Engines. Introduced in 1953, it is commonly used on light aircraft such as the Cessna 172 and Piper Cherokee , and remains in production as of 2024.
By 1961, Lycoming produced 600 to 700 engines per month. [17] Its most successful post-war products were a series of air-cooled flat-4 and flat-6 general aviation engines. Most famous among these are the O-320 and O-360 four-cylinder engines, and the O-540 six-cylinder engine.
The ECi O-320 is part of a family of normally aspirated, air-cooled, four-cylinder, direct-drive engines developed for certified and experimental aircraft. Its cylinders are arranged in horizontally opposed configuration and a displacement of 320 cubic inches (5.24 L). It is based on the Lycoming O-320 engine with ECi cylinder assemblies. [1] [2]
Robinson R22 Beta II with Lycoming O-360-J2A engine. O-360-J2A 145 hp (108 kW) at 2700 rpm, Minimum fuel grade 91/96 avgas, compression ratio 8.50:1. Same as the C1C except has O-320-B2C prop flange bushings, lightweight cylinders and lower power rating for helicopter use. [1] [2] This engine is used in the Robinson R22 helicopter.
Lycoming O-320 mounted in a Robinson R22 Beta The R22 is a simple and tight design. The R22 uses a horizontally mounted Lycoming O-320 (O-360-J2A on the Beta II), flat-four, air-cooled, naturally aspirated, carburetor-equipped, reciprocating engine. It is fueled with 100LL grade aviation gasoline.
The Lycoming O-360 was still years away in development and so a modification of the O-320 was undertaken by Lycoming. The O-320 received longer cylinder barrels and a crankshaft with a longer stroke to increase displacement and different piston connecting rods. This increased the compression to 8.5:1 and boosted power output to 170 hp (127 kW ...
The acceptable power range is 150 to 230 hp (112 to 172 kW). The standard engine used is the four cylinder, air-cooled, four-stroke, dual-ignition 150 hp (112 kW) Lycoming O-320 powerplant in pusher configuration. [1] The aircraft fuselage is made from tubing and composites. Its two-bladed rotor has a diameter of 29 ft (8.8 m).
The aircraft's recommended engine power range is 150 to 220 hp (112 to 164 kW) and standard engines used include the 160 hp (119 kW) Lycoming O-320 four-stroke powerplant. Construction time from the supplied kit is estimated as 1750 hours.