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The Lycoming O-540 is a family of air-cooled six-cylinder, horizontally opposed fixed-wing aircraft and helicopter engines of 541.5 cubic inch (8,874 cc) displacement, made by Lycoming Engines. The engine is a six-cylinder version of the four-cylinder Lycoming O-360.
Design and development
Producing between 230 and 350 horsepower these engines are installed in a large variety of aircraft. The main competitors are the Continental IO-520 and IO-550 series.
An AEIO version was developed for high-performance competition aerobatics aircraft. Starting at 260 hp (190 kW) the power was eventually increased to 300 hp (220 kW). The AEIO-540 family has achieved considerable success in aircraft such as the Extra 300, CAP 232, and Zivko Edge 540.
All engines have an additional prefix preceding the 540 to indicate the specific configuration of the engine. The numerous engine suffixes denote different accessories such as different manufacturers' carburetors, or different magnetos.
- Standard, direct-drive, normally aspirated Opposed engine, equipped with a carburetor
- Normally aspirated engine with fuel Injection
- Normally aspirated engine with fuel injection and inverted lubrication for Aerobatic use
- Turbocharged and fuel-injected
- Turbocharged with independent Electronic sensors and fuel injection controls for each cylinder, which manage detonation and exhaust gas temperature, make the engine compatible with a range of fuel compositions, producing up to 350 horsepower.
An LTIO-540 mounted on the right wing of a Piper Chieftain: The turbocharger can be seen in the upper right of the image.
- Left-hand (opposite-direction) rotation, turbocharged, fuel-injected; used as the right-hand engine on Piper PA-31-325 Navajo C/Rs and Piper PA-31-350 Chieftains to prevent critical engine control issues, and used for the left side of the Aerostar 700P
- Gearbox at the front end of the crankshaft to drive the propeller fewer revolutions per minute than the engine, normally aspirated with fuel injection, dry sump engine built specifically for the Aero Commander 560F
- Turbo-charged, injected and geared
- Supercharger driven by the engine, gearbox to drive propeller, and fuel injection (up to 380hp)
- Vertically mounted engine for use in a helicopter, normally aspirated and equipped with a carburetor
- Normally aspirated engine with fuel injection, mounted vertically for use in a helicopter
- Turbocharged engine equipped with a carburetor, mounted vertically for use in a helicopter
- Turbocharged engine with fuel injection, mounted vertically for use in a helicopter
- Helicopter engine mounted horizontally as in fixed-wing aircraft, normally aspirated with fuel injection; not used in any fixed-wing aircraft
- Same as a TIO-540, except the "1" indicates an integral accessory drive
- Same as a TIGO-540, except the "1" indicates an integral accessory drive
Data from FAA Lycoming IO-540 Series Type Certificate. Retrieved: 1 September 2008.