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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.
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]
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.
A mechanic told NTSB investigators that, on or about July 2, he removed a Piper P-28-161 airplane's previously installed Lycoming O-320-D3G engine and installed a Lycoming O-320-D2B.
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 first O-360 certified was the A1A model, certified on 20 July 1955 to United States CAR 13 effective March 5, 1952 as amended by 13-1 and 13-2. [4] The Lycoming IO-390 is an O-360 which has had its cylinder bore increased by 3 ⁄ 16 inch (4.8 mm), developing 210 hp (160 kW). [5] [6]
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.
The new four-place aircraft, named the American Aviation AA-5 Traveler, was powered by a Lycoming O-320-E2G engine of 150 hp (110 kW). It would carry four people at 121 knots (224 km/h) cruise speed and was certified under US FAR Part 23 .