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Franklin O-175

December 15, 2023

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 175 cu in (2.9 L). The power output was nominally 80 hp (60 kW). A later variant was designated O-180, despite sharing the same displacement.

O-175/4AC-176
Type Piston aircraft engine
National origin United States
Manufacturer Franklin Engine Company
First run 1940

A related four-cylinder engine of slightly smaller capacity was known as the O-170 or 4AC-171. It produced 60 hp (45 kW).

Variants edit

O-170 edit

4AC-171
60 hp (45 kW)

O-175 edit

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 edit

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

Applications edit

Specifications (4AC-176-BA2, O-175-1) edit

Data from Wilkinson[1]

General characteristics

  • Type: 4-cylinder air-cooled horizontally opposed aircraft piston engine
  • Bore: 4 in (102 mm)
  • Stroke: 3.5 in (89 mm)
  • Displacement: 176 cu in (2.88 L)
  • Length: 28.6 in (726 mm)
  • Width: 30.2 in (767 mm)
  • Height: 20 in (508 mm)
  • Dry weight: 182 lb (82.6 kg)

Components

  • Valvetrain: OHV, 1x inlet valve, 1x exhaust valve operated by pushrods
  • Fuel system: 1x Marvel-Schebler MA-3P updraught carburetor
  • Fuel type: 73 octane gasoline
  • Oil system: Pressure system at 40 psi (3 bar), wet sump
  • Cooling system: Air-cooled

Performance

See also edit

Related lists

References edit

Notes
  1. ^ Wilkinson, Paul H. (1945). Aircraft Engines of the world 1945. New York: Paul H. Wilkinson. pp. 88–89.
Bibliography
  • Gunston, Bill. (1986) World Encyclopedia of Aero Engines. Patrick Stephens: Wellingborough. p. 57

December 15, 2023
franklin, company, designation, american, cooled, aircraft, engine, 1940s, engine, horizontally, opposed, four, cylinder, displaced, power, output, nominally, later, variant, designated, despite, sharing, same, displacement, 176type, piston, aircraft, enginena. 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 175 cu in 2 9 L The power output was nominally 80 hp 60 kW A later variant was designated O 180 despite sharing the same displacement O 175 4AC 176Type Piston aircraft engineNational origin United StatesManufacturer Franklin Engine CompanyFirst run 1940A related four cylinder engine of slightly smaller capacity was known as the O 170 or 4AC 171 It produced 60 hp 45 kW Contents 1 Variants 1 1 O 170 1 2 O 175 1 3 O 180 2 Applications 3 Specifications 4AC 176 BA2 O 175 1 3 1 General characteristics 3 2 Components 3 3 Performance 4 See also 5 ReferencesVariants editO 170 edit 4AC 171 60 hp 45 kW O 175 edit 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 dd 4ACG 176O 180 edit 4AC 176 F3 O 180 1 Applications editAeronca 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 65Specifications 4AC 176 BA2 O 175 1 editData from Wilkinson 1 General characteristics Type 4 cylinder air cooled horizontally opposed aircraft piston engine Bore 4 in 102 mm Stroke 3 5 in 89 mm Displacement 176 cu in 2 88 L Length 28 6 in 726 mm Width 30 2 in 767 mm Height 20 in 508 mm Dry weight 182 lb 82 6 kg Components Valvetrain OHV 1x inlet valve 1x exhaust valve operated by pushrods Fuel system 1x Marvel Schebler MA 3P updraught carburetor Fuel type 73 octane gasoline Oil system Pressure system at 40 psi 3 bar wet sump Cooling system Air cooledPerformance Power output 65 hp 48 5 kW at 2 300 rpm for take off Specific power 0 37 hp cu in 16 837 kW L Compression ratio 6 1 Specific fuel consumption 0 49 lb hp h 0 298 kg kW h 220 US gal hp h cruising Oil consumption 0 003 lb hp h 0 0018 kg kW h 1 4 US gal hp h cruising Power to weight ratio 0 357 hp lb 0 587 kW kg See also editRelated lists List of aircraft enginesReferences editNotes Wilkinson Paul H 1945 Aircraft Engines of the world 1945 New York Paul H Wilkinson pp 88 89 BibliographyGunston Bill 1986 World Encyclopedia of Aero Engines Patrick Stephens Wellingborough p 57 Retrieved from https en wikipedia org w index php title Franklin O 175 amp oldid 1158615411, wikipedia, wiki, book, books, library,

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