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The Franklin O-400 (company designation 8AC) was an American air-cooled aircraft engine of the 1940s. The engine was of eight-cylinder, horizontally-opposed layout and displaced 397 cu in (6.5 l). The power output was 235 hp (175 kW).

O-400/8AC
Type	Piston aircraft engine
National origin	United States
Manufacturer	Franklin Engine Company
First run	1941

Variants

8AC-398

200 hp (149 kW) at 2,600 rpm.

8ACG-398

235 hp (175 kW) at 3,500 rpm. The 8ACG-398 was unusual in using a reduction gearing for take-off and direct drive for cruising.

Specifications (8ACG-398)

General characteristics

• Type: 8-cylinder air-cooled horizontally opposed aircraft piston engine
• Bore: 4.25 in (108.0 mm)
• Stroke: 3.5 in (88.9 mm)
• Displacement: 397.2 cu in (6,509 cc)

Components

• Valvetrain: OHV
• Cooling system: Air-cooled

Performance

• Power output: 235 hp (175.2 kW) at 2,600 rpm

See also

Related lists

• List of aircraft engines

References

Notes

Bibliography

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