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Lycoming O-540




First run in 1957, the Lycoming O-540 is a family of 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.

Generally these engines produce 230 to 350 horsepower. They are installed on a large number of different aircraft types. Their main competitive engine is the Continental IO-520 and IO-550 series.
The AEIO version was developed for high-performance competition aerobatics aircraft. Starting at 260 hp (190 kW), the power was then improved to 300 hp (220 kW). The AEIO-540 family has achieved results in competition aircraft such as the Extra 300, CAP 232, and Zivko Edge 540.


Lycoming IO 540





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 making the engine compatible with a range of fuel compositions producing up to 350 horsepower.
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. Also used for the left hand 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.


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.


AAC Angel
Aero Commander 500 series
AeroVolga LA-8L
Akaflieg München Mü30 Schlacro
Barrows Bearhawk
Bellanca Viking 300 (17-31 and 17-31TC)
Bellanca 17-31ATC Turbo Viking
Britten-Norman Islander
Britten-Norman Trislander
Brantly 305
CallAir A-9
Cessna 182
Dornier Do 28
Dream Tundra
Embraer EMB 202 Ipanema
Enaer T-35 Pillan
Evangel 4500
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MSW Votec 252T
Murphy Moose
Neiva Universal
PAC Super Mushshak
Piaggio P.166
Piper Aerostar
Piper Aztec
Piper Saratoga
Piper PA-24 Comanche
Piper PA-25 Pawnee
Piper PA-31 Navajo
Piper PA-46 Mirage
Pitts Special variants
PZL-104MA Wilga 2000
Raven 2XS
Ravin 500
Robinson R44
Rockwell Commander 114
Sharp Nemesis NXT
Socata TB-20
Socata TB-30 Epsilon
Team Tango Foxtrot
Utva 65
Van's Aircraft RV-10
Zlin Z-143
Zlín Z 50




Fuel Injected - 205 HP

Type: Six-cylinder air-cooled horizontally opposed engine
Bore: 5.125 in (130.2 mm)
Stroke: 4.375 in (111.1 mm)
Displacement: 541.5 (8.9 L)
Dry weight: 438 lb (199 kg)
Valvetrain: Two overhead valves per cylinder
Fuel system: Fuel injection
Fuel type: 100 octane rating gasoline
Cooling system: Air-cooled
Power output: 300 hp (223 kW) at 2,700 rpm at sea level
Specific power: 0.55 hp/ (25.14 kW/L)
Compression ratio: 8.7:1
Power-to-weight ratio: 0.68 hp/lb (1.12 kW/kg)



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