Franklin O-150

O-150/4AC
	4AC-150 engine on display at the San Diego Air & Space Museum
Type	Piston aircraft engine
National origin	United States
Manufacturer	Franklin Engine Company
First run	1938

The Franklin O-150 (company designation 4AC-150) was an American air-cooled aircraft engine of the late 1930s. The engine was of four-cylinder, horizontally-opposed layout and displaced 150 cu in (2 L). The power output was nominally 40 hp (30 kW).

Applications

Engines on display

Aerospace Museum of California - Franklin 0-150 (4AC-150)

Specifications (4AC-150)

Data from Jane's all the World's Aircraft 1938.^[1]

General characteristics

Type: 4-cylinder air-cooled horizontally opposed aircraft piston engine
Bore: 3.625 in (92.1 mm)
Stroke: 3.625 in (92.1 mm)
Displacement: 149.6 cu in (2.45 L)
Length: 27.5 in (70 cm)
Width: 34.375 in (87.3 cm)
Height: 18.375 in (46.7 cm)
Dry weight: 155 lb (70 kg)

Components

Valvetrain: Pushrod and rocker operated overhead valves. One intake, one exhaust
Fuel system: Stromberg NA-S2 updraught carburetor
Fuel type: 70 Octane gasoline
Oil system: Wet sump full pressure system
Cooling system: Air-cooled