Lycoming O-360

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Lycoming IO-360-A1B6
Type Piston aero-engine
Manufacturer Lycoming Engines
First run c.1955
Major applications Piper Cherokee
Cessna 172
Robin DR400

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.[1]

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[1] or twelve years.[2]

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.[3] 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) .[4][5]


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.[3][3][6][6][7][8]

  • 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[9]
  • 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[3]

General characteristics


  • Fuel type: 91/96 avgas minimum grade[12]
  • Oil system: 8 US qt (8 l) dry sump
  • Cooling system: air-cooled


See also[edit]


  1. ^ a b Lycoming (2004). "360 Series" (PDF). Retrieved 2008-09-16. 
  2. ^ Lycoming Engines (8 July 2013). "Recommended Time Between Overhaul Periods" (PDF). Retrieved 8 July 2013. 
  3. ^ a b c d Federal Aviation Administration (August 2009). "TYPE CERTIFICATE DATA SHEET NO. E-286 Revision 20" (PDF). Retrieved 9 September 2011. 
  4. ^ Lycoming Engines (n.d.). "Lycoming IO-390-X". Retrieved 2009-01-07. 
  5. ^ Lycoming Engines (2004). "Specialty datasheet" (PDF). Retrieved 2008-12-20. 
  6. ^ a b Federal Aviation Administration (April 2004). "TYPE CERTIFICATE DATA SHEET NO. 1E10 Revision 22". Retrieved 2009-01-17. 
  7. ^ Federal Aviation Administration (March 1986). "TYPE CERTIFICATE DATA SHEET NO. E26EA Revision 4". Retrieved 2009-01-18. 
  8. ^ Federal Aviation Administration (March 1986). "TYPE CERTIFICATE DATA SHEET NO. E16EA Revision 5". Retrieved 2009-01-18. 
  9. ^ Federal Aviation Administration (13 July 2004). "Airplane Flying Handbook" (PDF). Archived from the original (PDF) on 21 September 2012. Retrieved 18 September 2012. 
  10. ^ Mooney Aircraft, Inc. (March 1967). Executive 21 Owners Manual. 
  11. ^ 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". Retrieved 2009-03-09. 
  12. ^ Lycoming (2010). "Lycoming Service Instruction 1070Q" (PDF). Archived from the original (PDF) on 17 November 2011. Retrieved 3 November 2011. 

External links[edit]