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The Lycoming O-360 is a family of four-cylinder, direct-drive, horizontally opposed, air-cooled, pistonaircraft 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 ³⁄₁₆ inch (4.76 mm), developing 210 hp (157 kW).^[5][6]

Series[edit]

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-360carbureted 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-360turbocharged series
• LTO-360 turbocharged left-hand rotation series
• IO-360fuel-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-360aerobatic 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

Variants[edit]

Applications[edit]

O-360

• Hurricane Aircat (airboat)

LO-360

IO-360

• Cessna 172R/172S
• Mooney M20^[11]

LIO-360

AIO-360

AEIO-360

HIO-360

LHIO-360

• Silvercraft SH-3^[12]
• Silvercraft SH-4^[12]

Specifications (O-360-A1A)[edit]

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

General characteristics

• Type: Four-cylinder, dual magneto, horizontally opposed, four-strokeaircraft engine
• Bore: 5.125 in (130 mm)
• Stroke: 4.375 in (111 mm)
• Displacement: 361 cu in (5,916 cc)
• Dry weight: 258 lb (117 kg)

Components

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

Performance

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• 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

References[edit]

1. ^ ^abLycoming (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. ^ ^abcFederal 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. ^ ^abFederal 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'. lycoming.com. Retrieved 11 July 2018.

External links[edit]

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• 'Operator's Manual O-360, HO-360, IO-360, AIO-360, HIO-360 & TIO-360 Series'(PDF). Lycoming. October 2005.