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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.

Contents

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.

Variants

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.

GO-480
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.
GSO-480
Supercharger driven by the engine, gearbox to drive propeller, and equipped with a carburetor. Designated the O-480-1 by the US military.
IGSO-480
Supercharger driven by the engine, gearbox to drive propeller, with fuel Injection. Designated the O-480-3 by the US military.
IGO-480
Gearbox to drive propeller, normally aspirated with fuel injection.

Applications

  • 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


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