Franklin O-175 Explained

The Franklin O-175 (company designation 4AC-176) was an American air-cooled aircraft engine of the 1940s. The engine was of horizontally-opposed four-cylinder and displaced 1751NaN1. The power output was nominally 80abbr=onNaNabbr=on. A later variant was designated O-180, despite sharing the same displacement.

A related four-cylinder engine of slightly smaller capacity was known as the O-170 or 4AC-171. It produced 60abbr=onNaNabbr=on.

Variants

O-170

4AC-171:60abbr=onNaNabbr=on

O-175

4AC-176:

4AC-176-B - 65 hp (48 kW) at 2,200 rpm

4AC-176-BA/(O-175-1) - 65 hp (48 kW) at 2,300 rpm

4AC-176-C - 75 hp (56 kW) at 2,500 rpm

4AC-176-D - 80 hp (60 kW) at 2,650 rpm

4AC-176-F - 80 hp (60 kW) at 2,500 rpm

4ACG-176

O-180

4AC-176-F3 (O-180-1)

Applications

Aeronca L-3D
Bowyer BW-1 flying wing
CAP-4 Paulistinha
Harris Little Jewel
Interstate Cadet
IPT-7 Junior
Jensen Sport (O-170)
Johnson-Funke monoplane
Langley Twin
Piper J-3 Cub
Piper J-4
Piper L-4
Porterfield Collegiate
Taylorcraft BF-60 (O-170)
Taylorcraft BF-65

References

Notes

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