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

Performance

Power output: 40 hp (30 kW) at 1,875 rpm
Compression ratio: 6.66:1
Fuel consumption: 4.4 gal/h (17 L/h)
Specific fuel consumption: 0.54 lb/hp/h

References

Notes

^ Grey, C.G.; Bridgman, Leonard, eds. (1938). Jane's all the World's Aircraft 1938. London: Sampson Low, Marston & company, ltd. p. 85d.

Bibliography

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

[JAWA1938-1] Grey, C.G.; Bridgman, Leonard, eds. (1938). Jane's all the World's Aircraft 1938. London: Sampson Low, Marston & company, ltd. p. 85d.

[1]

v t e United States military piston aircraft engine designation system
H (four-bank H-configuration inline)	H-1640 XH-2240 XH-2470 XH-2600 XH-3130 XH-3730 H-4070
IV (inverted-V inline)	IV-1430 IV-2040 IV-2220
L (single-bank inline)	L-330 L-365 L-375 L-390 L-410 L-440 L-510 L-825
O (opposed)	O-15 O-40 O-45 O-90 O-100 O-145 O-150 O-170 O-175 O-180 O-190 O-200 (C) O-200 (F) O-205 O-235 O-290 O-300 O-335 O-360 (C) O-360 (L) O-405 O-425 O-435 O-470 O-480 O-520 O-540 (F) O-540 (L) O-550 O-580 O-805 O-1230
R (radial)	R-250 R-265 R-270 R-370 (LB) R-370 (K) R-420 R-440 R-500 R-540 (W) R-540 (K) R-545 R-550 R-600 R-670 R-680 R-720 R-755 R-760 R-790 R-830 R-915 R-975 DR-980 R-985 R-1044 R-1300 R-1340 R-1454 R-1510 R-1535 R-1640 R-1670 R-1690 R-1750 R-1820 R-1830 R-1860 R-2000 R-2060 R-2160 R-2180 R-2600 R-2800 R-3350 R-4090 R-4360 XR-7755
V (upright-V inline)	V-720 V-1150 V-1237 V-1400 V-1440 V-1460 V-1510 V-1560 V-1570 V-1650 (P) V-1710 V-1950 V-3420
V (inverted-V inline)	V-770 V-1650 (L)
VG (inverted-V inline)	VG-1410
W (three-bank W-configuration inline)	W-2779
See also: X-1800 US military gas turbine aeroengines Piston engine configurations