Lycoming O-540

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A six-cylinder, horizontally opposed direct drive aeroplane engine of 540 cubic inch (8.8 l) displacement.

Versions of the "O" type engine are equipped with carburetors (referred to as "O-540" and fuel injected versions are denominated as "IO-540s"). Turbochargers are known as "TIO-540".

Generally these engines produce 260 to 315 horsepower (194 to 235kW). They are installed on many Aero Commanders, Piper Navajos, Chieftains, Cessnas, Piper Aztecs, Piper Saratogas Piper PA-24 Comanches, Robinson R44, and aircraft from the Aerostar Aircraft Corp. Their main competitive engine is the Continental IO-520 and IO-550 series.