Neha Patil (Editor)

Lycoming O 480

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Lycoming O-480

The Lycoming O-480 is a family of six-cylinder, horizontally opposed fixed-wing aircraft engines of 479.6 cubic inch (7.86 l) displacement, made by Lycoming Engines. The engine is a six-cylinder version of the four-cylinder Lycoming O-320.


Design and development

O-480 series engines are installed on a number of different aircraft types. Their main competitive engines are the Continental IO-520 and IO-550 series.


All engines have an additional prefix preceding the 480 to indicate the specific configuration of the engine. Although the series is known as the "O-480", they're are the only geared engines in the series. There are also numerous engine suffixes, denoting different accessories such as different manufacturers' carburetors, or different magnetos.

Normally aspirated Opposed engine, equipped with a carburetor and Gearbox at the front end of the crankshaft to drive the propeller at a lower RPM than the engine.
Supercharger driven by the engine, gearbox to drive propeller, and equipped with a carburetor. Designated the O-480-1 by the US military.
Supercharger driven by the engine, gearbox to drive propeller, with fuel Injection. Designated the O-480-3 by the US military.
Gearbox to drive propeller, normally aspirated with fuel injection.


  • Aero Commander 560, 560A, 560E and 680, 680E and the pressurized 720 Alti-Cruiser.
  • Aermacchi AM3CM (Bosbok)
  • Beechcraft Twin Bonanza
  • Beechcraft Queen Air
  • Dornier Do 27
  • Helio Courier
  • Soko J-20 Kraguj
  • Temco 58
  • Utva 66
  • Specifications (GSO-480-A1A6)

    Data from FAA Type Certificate.

    General characteristics

  • Type: Six-cylinder air-cooled geared supercharged horizontally opposed engine
  • Bore: 5.125 in (130 mm)
  • Stroke: 3.875 in (98 mm)
  • Displacement: 479.6 inĀ³ (7.86 l)
  • Dry weight: 498 lb dry
  • Components

  • Valvetrain: Two overhead valves per cylinder
  • Supercharger: 11.27:1 ratio, providing 48" Hg (1.6 atm / 8.8 psi) manifold pressure at sea level at maximum power
  • Fuel type: 100 octane rating gasoline
  • Cooling system: Air-cooled
  • Reduction gear: 77:120 (.642:1)
  • Performance

  • Power output: 340 hp at 3,400 rpm at sea level
  • Compression ratio: 7.3:1
  • References

    Lycoming O-480 Wikipedia