Lycoming O-360

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Lycoming IO-360-A1B6
Type Piston aircraft engine
National origin United States
Manufacturer Lycoming Engines
First run 1952
1963 (injected version)
Major applications Cessna 172 R & S
Cessna 177 Cardinal
Mooney M20
Produced 1955–present
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]

  • 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]
  • 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



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.

Specifications (O-360-A1A)[edit]

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

General characteristics


  • Fuel type: 91/96 avgas minimum grade[13]
  • Oil system: 8 US qt (8 l) wet sump
  • Cooling system: air-cooled


  • Power output: 180 hp (134 kW) at 2700 rpm
  • Compression ratio: 8.5:1
  • Fuel consumption: 7.8 US gal (30 L) to 9 US gal (34 L) per hour[14]

See also[edit]

Related lists


  1. ^ a b Lycoming (2004). "360 Series" (PDF). Archived from the original (PDF) on 2010-11-26. Retrieved 2008-09-16.
  2. ^ Lycoming Engines (8 July 2013). "Recommended Time Between Overhaul Periods" (PDF). Archived from the original (PDF) on 2013-09-13. Retrieved 8 July 2013.
  3. ^ Enfield, Samuel; Burr, R.; Badgett, R.; et al., eds. (April 15, 1966). Airboats (PDF) (Technical report). San Francisco: Army Concept Team in Vietnam. p. 2. R-1590 0 – via DTIC.
  4. ^ a b c Federal Aviation Administration (August 2009). "Type Certificate Data Sheet No. E-286 Revision 20" (PDF). Retrieved 9 September 2011.
  5. ^ Lycoming Engines (n.d.). "Lycoming IO-390-X". Retrieved 2009-01-07.
  6. ^ Lycoming Engines (2004). "Specialty datasheet" (PDF). Retrieved 2008-12-20.
  7. ^ Federal Aviation Administration (10 January 2018). "Type Certificate Data Sheet No. 1E10 Revision 28" (PDF). Retrieved 26 January 2019.
  8. ^ Federal Aviation Administration (March 1986). "Type Certificate Data Sheet No. E26EA Revision 4". Retrieved 2009-01-18.
  9. ^ Federal Aviation Administration (March 1986). "Type Certificate Data Sheet No. E16EA Revision 5". Retrieved 2009-01-18.
  10. ^ Federal Aviation Administration (13 July 2004). "Airplane Flying Handbook" (PDF). Archived from the original (PDF) on 21 September 2012. Retrieved 18 September 2012.
  11. ^ Mooney Aircraft, Inc. (March 1967). Executive 21 Owners Manual.
  12. ^ a b Federal Aviation Administration (February 2007). "Docket No. FAA-2006-25948; Directorate Identifier 2006-NE-32-AD; Amendment 39-14951; AD 2007-04-19". Archived from the original on 2011-07-13. Retrieved 2009-03-09.
  13. ^ Lycoming (2010). "Lycoming Service Instruction 1070Q" (PDF). Archived from the original (PDF) on 17 November 2011. Retrieved 3 November 2011.
  14. ^ "O-360, HO-360, IO-360, AIO-360, HIO-360 & TIO-360 Operator's Manual". Retrieved 11 July 2018.

External links[edit]