Franklin O-400

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

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).

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

Performance

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

See also

Related lists

References

Notes
    Bibliography

    • Gunston, Bill. (1986) World Encyclopedia of Aero Engines. Patrick Stephens: Wellingborough. p. 57
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