American Helicopter Museum - Aircraft Engines / 11 Franklin 425 Air cooled Engine
Bill Maloney
5/22/2008

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11 Franklin O-425 Air cooled Engine

11 Franklin O-425 Aircooled Engine

Franklin O-425 6ACV-245 Aircraft Engine Specifications:

Number of Cylinders : 6
Displacement: 425 ci
Bore: 4.75 inches
Stroke: 4 inches
Compression Ratio: 7.4:1
Aspiraton: Stromberg PS-78D carburetor
Fuel: 80/87 Avgas
Weight: 370 lbs
Length: inches
Diameter: inches
Output: 250hp at 3,200rpm
First Flight : 1944
Airframes used on:
Cost: $