Lycoming O-360

Last updated
Lycoming IO-360-A1B6
Type Piston aircraft engine
National originUnited States
Manufacturer Lycoming Engines
First run1952
1963 (injected version)
Major applications Cessna 172 R & S
Cessna 177 Cardinal
Mooney M20
Developed into Lycoming IO-390
Lycoming O-540
Lycoming IO-720

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 horsepower. [1]


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 316 inch (4.76 mm), developing 210 hp (157 kW). [5] [6]


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 4.375 in (130.2 and 111.1 mm) bore and stroke. [4] [7] [8] [9]



Piper PA-44-180 Seminole features two Lycoming O-360 engines Piper PA44-180 aircraft.jpg
Piper PA-44-180 Seminole features two Lycoming O-360 engines
An LIO-360 on the starboard wing of a Piper PA-34-200 Seneca I. LIO360engine.JPG
An LIO-360 on the starboard wing of a Piper PA-34-200 Seneca I.

Specifications (O-360-A1A)

Data from Type Certificate Data Sheet E-286 [4]

General characteristics



See also

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