Lycoming O-540

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The Lycoming O-540 is a family of six-cylinder, horizontally opposed aircraft engines of 540 cubic inch (8.8 l) displacement.

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.

[edit] Variants

All engines will have an additional number following the 540 to indicate the specific configuration, based on the aircraft the engine is used on.

  • O-540 - standard, direct-drive, normally aspirated engine, equipped with a carburetor
  • IO-540 - normally aspirated engine with fuel injection
  • TIO-540 - turbocharged, fuel injected
  • GTSIO-540 - geared output


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