The Lycoming O-360 is a family of four-cylinder, direct-drive, horizontally opposed, air-cooled, piston aircraft engines. Engines in the O-360 series produce between 145 and 225 horsepower (109 to 168kW), with the basic O-360 producing 180 horsepower.[1]
Flat-four piston aircraft engine family by Lycoming
For a similarly named and broadly similar aircraft engine by another manufacturer, see Continental IO-360.
The engine family has been installed in thousands of aircraft, including the Cessna 172, Piper Cherokee/Archer, Grumman Tiger, and many home-built types. It has a factory rated time between overhaul (TBO) of 2000 hours[1] or twelve years.[2] O-360 family engines are also widely used in airboats, most notably in the Hurricane Aircats used by the US Army during the Vietnam War.[3]
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 (4.76mm), developing 210hp (157kW).[5][6]
Series
The O-360 family of engines comprises 167 different models with 12 different prefixes. All have a 361-cubic-inch (5.92-liter) displacement and 5.125 and 4.375in (130.2 and 111.1mm) bore and stroke.[4][7][8][9]
O-360 carbureted series
HO-360 horizontally mounted series for helicopter installation
LO-360 same as O-360, but with left-hand rotating crankshaft, for use in pairs on twin-engined aircraft[10]
Enfield, Samuel; Burr, R.; Badgett, R.; etal., eds. (April 15, 1966). Airboats(PDF) (Technical report). San Francisco: Army Concept Team in Vietnam. p.2. R-1590 0. Archived from the original(PDF) on August 3, 2020 – via DTIC.
Federal Aviation Administration (July 13, 2004). "Airplane Flying Handbook"(PDF). Archived from the original(PDF) on September 21, 2012. Retrieved September 18, 2012.
Mooney Aircraft, Inc. (March 1967). Executive 21 Owners Manual.
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