Lycoming O 360

Updated on Nov 23, 2024

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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 168 kW), with the basic O-360 producing 180.

The engine family has been installed in thousands of aircraft, including the Cessna 172, Piper Cherokee/Archer, Grumman Tiger, and many home-built craft. It has a factory rated time between overhaul (TBO) of 2000 hours or twelve years.

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. The Lycoming IO-390 is an O-360 which has had its cylinder bore increased by ³⁄₁₆ inch (4.76 mm), developing 210 hp (157 kW) .

Series

The O-360 family of engines comprise 167 different models with 12 different prefixes. All have a 361-cubic-inch (5.92-liter) displacement and 5.125 and 4.375 in (130.2 and 111.1 mm) bore and stroke.

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

TO-360 turbocharged series

LTO-360 turbocharged left-hand rotation series

IO-360 fuel-injected series

LIO-360 same as IO-360, but with left-hand rotating crankshaft

AIO-360 inverted mount (dry sump aerobatic) fuel-injected series

AEIO-360 aerobatic fuel-injected series

HIO-360 horizontally mounted fuel-injected series for helicopters

LHIO-360 left-hand rotation, fuel-injected, horizontally mounted for helicopters

TIO-360 turbocharged and fuel-injected series