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GO-480
Lycoming GO-480-B1 on display at the Deutsches Museum Flugwerft Schleissheim
Type	Piston aero-engine
National origin	United States
Manufacturer	Lycoming Engines
First run	1953
Major applications	Dornier Do 27 Helio Courier Utva 66
Produced	1954–1986 out of production
Developed from	Lycoming O-320

The Lycoming GO-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

GO-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", there are 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
• Pilatus PC-6 Porter
• 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 in (7.86 L)
• Dry weight: 498 lb dry (226 kg)

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

See also

Comparable engines

• Continental O-470

Related lists

• List of aircraft engines

References

1. ^ Page listing all variants of the Lycoming O-480 series. Retrieved on 10 January 2009.
2. FAA GO-480 Series Type Certificate. Retrieved on 10 January 2009.
3. ^ FAA Lycoming GSO-480 Series Type Certificate. Retrieved on 10 January 2009.

• Lycoming aircraft engines
• 1950s aircraft piston engines
• Boxer engines