The Lycoming O-360 is a family of

four-cylinder The engine configuration describes the fundamental operating principles by which internal combustion engines are categorized. Piston engines are often categorized by their cylinder layout, valves and camshafts. Wankel engines are often categorize ...

, direct-drive,

horizontally opposed A flat engine is a piston engine where the cylinders are located on either side of a central crankshaft. Flat engines are also known as horizontally opposed engines, however this is distinct from the less common opposed-piston engine design, wh ...

air-cooled Air-cooled engines rely on the circulation of air directly over heat dissipation fins or hot areas of the engine to cool them in order to keep the engine within operating temperatures. In all combustion engines, a great percentage of the heat ge ...

piston A piston is a component of reciprocating engines, reciprocating pumps, gas compressors, hydraulic cylinders and pneumatic cylinders, among other similar mechanisms. It is the moving component that is contained by a cylinder and is made gas-tig ...

aircraft engine An aircraft engine, often referred to as an aero engine, is the power component of an aircraft propulsion system. Most aircraft engines are either piston engines or gas turbines, although a few have been rocket powered and in recent years many ...

s. Engines in the O-360 series produce between 145 and 225 horsepower (109 to 168 kW), with the basic O-360 producing 180 horsepower. The engine family has been installed in thousands of aircraft, including the

Cessna 172 The Cessna 172 Skyhawk is an American four-seat, single-engine, high wing, fixed-wing aircraft made by the Cessna Aircraft Company.

Piper Cherokee The Piper PA-28 Cherokee is a family of two-seat or four-seat light aircraft built by Piper Aircraft and designed for flight training, air taxi and personal use.Plane and Pilot: ''1978 Aircraft Directory'', pages 62–64. Werner & Werner Corp, ...

/Archer, Grumman Tiger, and many home-built types. It has a factory rated

time between overhaul Time between overhauls (abbreviated as TBO or TBOH) is the manufacturer's recommended number of running hours or calendar time before an aircraft engine or other component requires overhaul. On rotorcraft, many components have recommended or man ...

(TBO) of 2000 hours or twelve years. O-360 family engines are also widely used in

airboat An airboat (also known as a planeboat, swamp boat, bayou boat, or fanboat) is a flat-bottomed watercraft propelled by an aircraft-type propeller and powered by either an aircraft or automotive engine. In early aviation history the term ''airboat ...

s, most notably in the

Hurricane Aircat The Hurricane Aircat was an airboat used as a riverine patrol boat by the US Army and South Vietnamese Army (ARVN) during the Vietnam War. It was used to conduct various counterinsurgency (COIN) and patrol missions in riverine and marshy areas wh ...

s used by the

US Army The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cla ...

during the

Vietnam War The Vietnam War (also known by #Names, other names) was a conflict in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. It was the second of the Indochina Wars and was officially fought between North Vie ...

. 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 The Lycoming IO-390 engine is a horizontally opposed, four-cylinder aircraft engine, manufactured by Lycoming Engines. There is no carburetted version of the engine, which would have been designated O-390 and therefore the base model is the ...

is an O-360 which has had its cylinder bore increased by , developing .

Series

The O-360 family of engines comprises 167 different models with 12 different prefixes. All have a displacement and

bore Bore or Bores often refer to: *Boredom * Drill Relating to holes * Boring (manufacturing), a machining process that enlarges a hole ** Bore (engine), the diameter of a cylinder in a piston engine or a steam locomotive ** Bore (wind instruments), ...

and

stroke A stroke is a medical condition in which poor blood flow to the brain causes cell death. There are two main types of stroke: ischemic, due to lack of blood flow, and hemorrhagic, due to bleeding. Both cause parts of the brain to stop functionin ...

. * O-360

carbureted A carburetor (also spelled carburettor) is a device used by an internal combustion engine to control and mix air and fuel entering the engine. The primary method of adding fuel to the intake air is through the venturi tube in the main meterin ...

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 In an internal combustion engine, a turbocharger (often called a turbo) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake gas, forcing more air into the engine in order to pro ...

series * LTO-360 turbocharged left-hand rotation series * IO-360

fuel-injected Fuel injection is the introduction of fuel in an internal combustion engine, most commonly automotive engines, by the means of an injector. This article focuses on fuel injection in reciprocating piston and Wankel rotary engines. All compr ...

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 Aerobatics is the practice of flying maneuvers involving aircraft attitudes that are not used in conventional passenger-carrying flights. The term is a portmanteau of "aerial" and "acrobatics". Aerobatics are performed in aeroplanes and glid ...

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

Applications

;O-360 ;LO-360 *

Beechcraft Duchess The Beechcraft Model 76 Duchess is an American twin-engined monoplane built by Beechcraft intended partly as a low cost introduction to twin-engine aircraft. Development Developed as Model PD289 (Preliminary Design 289), the prototype was u ...

* Piper PA-44-180 Seminole ;IO-360 ;LIO-360 LIO360engine

* Piper PA-34 Seneca I *

Diamond DA42 The Diamond DA42 Twin Star is a four seat, twin engine, propeller-driven airplane developed and manufactured by the People's Republic of China, Chinese-owned, Austria-based company Diamond Aircraft Industries. It was Diamond's first twin engin ...

;AIO-360 *

Stephens Akro Stephens is a surname. It is a patronymic and is recorded in England from 1086. Notable people with the surname include: *Alexander H. Stephens (1812–1883), Vice President of the Confederate States of America *Alison Stephens (1970–2010), Brit ...

;AEIO-360 * Aero-Cam Slick 360 *

Aviat Eagle II The Christen Eagle, which later became the Aviat Eagle in the mid-1990s, is an aerobatic sporting biplane aircraft that has been produced in the United States since the late 1970s. Design Designed to compete with the Pitts Special by Frank Ch ...

American Champion Super Decathlon The American Champion 8KCAB Decathlon and Super Decathlon are two-seat fixed conventional gear light airplanes designed for flight training and personal use and capable of sustaining aerobatic stresses between +6g and −5 ''g''. The Decathlo ...

Extra EA-200 The Extra 200 (Type EA-200) is a two-seat, tandem arrangement, low-wing aerobatic monoplane with conventional (taildragger) landing gear fully capable of Unlimited category competition, built by Extra Flugzeugbau. Designed by Walter Extra, it w ...

FFA AS-202 Bravo The AS/SA 202 Bravo is a two to three-seat civil light aircraft jointly designed and manufactured by the Swiss company Flug- und Fahrzeugwerke Altenrhein (FFA) and the Italian company Savoia-Marchetti. The aircraft was designated the AS 202 in S ...

Great Lakes Sport Trainer The Great Lakes Sport Trainer is an American biplane trainer and aerobatic aircraft. It was originally produced in large numbers before the company building it went bankrupt in the Great Depression in 1933. Owing to its continuing popularity, ho ...

Grob G 115E The Grob G 115 is a general aviation fixed-wing aircraft, primarily used for flight training. It is built in Germany by Grob Aircraft (Grob Aerospace before January 2009). The E variant with a 3-blade variable pitch propeller is in service with ...

Mudry CAP 10 The Mudry CAP 10 is a two-seat training aerobatic aircraft first built in 1970 and still in production in 2007. The plane was developed from the Piel Super Emeraude and was born as the CP100. The name changed to CAP 10, CAP for 'Constructions Aéro ...

Peña Capeña The Peña Capeña is a French aerobatic amateur-built aircraft that was designed by competitive aerobatic pilot Louis Peña of Dax, Landes and made available in the form of plans for amateur construction.Bayerl, Robby; Martin Berkemeier; et al ...

Pitts Special The Pitts Special (company designations S-1 and S-2) is a series of light aerobatic biplanes designed by Curtis Pitts. It has accumulated many competition wins since its first flight in 1944. The Pitts biplanes dominated world ae ...

Tech Aero TR 200 The Tech Aero TR 200 is a French homebuilt aerobatic aircraft that was designed and produced by Tech Aero of Glisolles, first flown in August 1988. When it was available the aircraft was supplied as a kit for amateur construction.Purdy, Don ...

Valmet L-70 Vinka The Valmet L-70 ''Vinka'' is a Finnish-designed piston-powered military basic trainer aircraft of the 1970s. A production run of 30 aircraft were built for the Finnish Air Force in the early 1980s, and although the type was not exported, it formed ...

* Zlín Z 242 ;HIO-360 *

Enstrom F-28 The Enstrom F-28 and 280 are a family of small, light piston engine powered helicopters produced by the Enstrom Helicopter Corporation.Apostolo, Giorgio: ''The Illustrated Encyclopedia of Helicopters'', pages 64-65. Bonanza Books, New York, 1984 ...

OH-23 Raven The Hiller OH-23 Raven is a three-place, military light observation helicopter based on the Hiller Model 360. The Model 360 was designated by the company as the UH-12 ("UH" for United Helicopters),Donald, David. ''The Complete Encyclopedia of W ...

Schweizer 300 The Schweizer S300 series (formerly Hughes 300, Schweizer 300, and Sikorsky S-300) family of light utility helicopters was originally produced by Hughes Helicopters, as a development of the Hughes 269. Later manufactured by Schweizer Aircraft, a ...

;LHIO-360 * Silvercraft SH-3 *

Silvercraft SH-4 The Silvercraft SH-4 is an Italian three-seater light helicopter designed and built by Silvercraft SpA. Design and production The Silvercraft SH-4 was the first Italian designed helicopter to gain Italian and FAA certification. The prototype was ...

Specifications (O-360-A1A)

References

External links