# Franklin O-150 > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Franklin_O-150 > Markdown URL: https://mediated.wiki/source/Franklin_O-150.md > Source: https://en.wikipedia.org/wiki/Franklin_O-150 > Source revision: 1352559501 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) American piston aircraft engine 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](/source/Flat-four_engine) and [displaced](/source/Engine_displacement) 150 cu in (2 L). The power output was nominally 40 hp (30 kW). ## Applications - [Aeronca 50 Chief](/source/Aeronca_50_Chief) - [Bartlett Zephyr](/source/Bartlett_Zephyr) - [Clutton-Tabenor FRED](/source/Clutton-Tabenor_FRED) - [Fetterman Chickadee](https://en.wikipedia.org/w/index.php?title=Fetterman_Chickadee&action=edit&redlink=1) - [Payne MC-7 pusher](https://en.wikipedia.org/w/index.php?title=Payne_MC-7_pusher&action=edit&redlink=1) - [Piper J-3 Cub](/source/Piper_J-3_Cub) - [Rose Parakeet](/source/Rose_Parakeet) - [Taylorcraft BF-65](/source/Taylorcraft_B) - [Taylorcraft L-2](/source/Taylorcraft_L-2) ## Engines on display - [Aerospace Museum of California](/source/Aerospace_Museum_of_California) - Franklin 0-150 (4AC-150) ## Specifications (4AC-150) O-150 on display at the [Air Zoo](/source/Air_Zoo) *Data from* *Jane's all the World's Aircraft 1938.*[1] ### General characteristics - **Type:** 4-cylinder air-cooled [horizontally opposed](/source/Horizontally_opposed) aircraft piston engine - **[Bore](/source/Bore_(engine)):** 3.625 in (92.1 mm) - **[Stroke](/source/Stroke_(engine)):** 3.625 in (92.1 mm) - **[Displacement](/source/Engine_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](/source/Dry_weight):** 155 lb (70 kg) ### Components - **[Valvetrain](/source/Valvetrain):** Pushrod and rocker operated overhead valves. One intake, one exhaust - **Fuel system:** Stromberg NA-S2 updraught carburetor - **Fuel type:** [70 Octane](/source/Octane_rating) 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](/source/Compression_ratio):** 6.66:1 - **Fuel consumption:** 4.4 gal/h (17 L/h) - **[Specific fuel consumption](/source/Brake_specific_fuel_consumption):** 0.54 lb/hp/h ## See also **Comparable engines** - [Lycoming O-145](/source/Lycoming_O-145) **Related lists** - [List of aircraft engines](/source/List_of_aircraft_engines#Franklin) ## References Wikimedia Commons has media related to [Franklin O-150](https://commons.wikimedia.org/wiki/Category:Franklin_O-150). **Notes** 1. **[^](#cite_ref-JAWA1938_1-0)** 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 v t e Franklin aircraft engines By displacement O-110 O-120 O-150 O-170 O-175 O-180 O-200 O-225 O-235 O-265 O-300 O-315 O-335 O-350 O-400 O-405 O-425 O-500 O-540 O-595 O-805 Two-cylinder engines By displacement O-110 O-120 By company designation 2A-110 2A-120 2A4-45 2A4-49 2AL-112 Four-cylinder engines By displacement O-150 O-170 O-175 O-180 O-200 O-225 O-235 By company designation 4A-225 4A-235 4A4-100 4A4-75 4A4-85 4A4-95 4AC-150 4AC-171 4AC-176 4AC-199 4ACG-176 4AL-225 Sport 4 Six-cylinder engines By displacement O-265 O-300 O-315 O-335 O-350 O-405 O-425 O-500 By company designation 6A-335 6A-350 6A3 6A4 6A8-215 6AC-264 6AC-298 6AC-403 6ACV-245 6AG-335 6AG4-185 6AG6-245 6AGS-335 6AGS6-245 6AL-315 6AL-335 6AL-500 6ALV-335 6AS-335 6V-335 6V4 6V6-245-B16F 6V6-245 6V6-300-D16FT 6V6-300 6VS-335 Eight-cylinder engines By displacement O-400 O-540 By company designation 8AC-398 8ACG-398 8ACG-538 8ACGSA-538 8ACSA-538 12-cylinder engines By displacement O-595 O-805 By company designation 12AC-596 12AC-806 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-1740 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 R-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 --- Adapted from the Wikipedia article [Franklin O-150](https://en.wikipedia.org/wiki/Franklin_O-150) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Franklin_O-150?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.