Menasco Pirate

The Menasco Pirate series were four-cylinder, air-cooled, in-line, inverted aero-engines, built by the Menasco Motors Company of Burbank, California, for use in light general and sport aircraft during the 1930s and 1940s.[1] The Menasco engines came in both normally aspirated and supercharged forms, with the supercharged models exhibiting superior performance at higher altitudes, with a relatively small increase in dimensions and weight. The supercharged models had the S suffix added to their designation to show supercharging.[2]

Type Piston aero engine
National origin United States
Manufacturer Menasco Motors Company
First run 1930s
Major applications Great Lakes 2T-1MS
Ryan ST


Menasco A-4 Pirate (also listed as Menasco 4A)
90 hp.[3]
Menasco B-4 Pirate
95 hp.[3]
Menasco C-4 Pirate (Military designation L-365)
125 hp.[3] Compression ratio 5.8: 1, dry weight 300 lb[4]
Menasco Pirate C-4S
Super-charged 150 hp.[3]
Menasco D-4 Pirate
125 hp, compression ratio 5.5:1, dry weight 311 lb[4]
Menasco D-4-87 Super Pirate
134 hp,Compression ratio 6:1, dry weight 310 lb[4]
Menasco L-365-1
military designation for the C4-4LA
Menasco L-365-3
similar to -1 but changes to cylinder heads, lubrication and carburettor


Specifications (Menasco C4S Pirate)

General characteristics

  • Type: 4-cylinder, air-cooled, in-line, inverted engine
  • Bore: 4.75 in (120.65 mm)
  • Stroke: 5.125 in (130.18 mm)
  • Displacement: 363.27 cu in (5.95 L)
  • Length: 47.5 in (1,206 mm)
  • Width: 17.7 in (449 mm)
  • Height: 28.5 in (724 mm)
  • Dry weight: 299 lb (135 kg)


  • Valvetrain: 1 inlet and 1 exhaust valve per cylinder
  • Fuel system: 1 Stromberg Carburetor
  • Fuel type: 73 octane
  • Cooling system: Air


See also

Comparable engines

Related lists


  1. "Menasco Pirate". 2011. Retrieved 2011-05-26.
  2. Parker, Dana T. Building Victory: Aircraft Manufacturing in the Los Angeles Area in World War II, pp. 122–24, Cypress, CA, 2013.
  3. Herschel, Smith. (1986). A History of Aircraft Piston Engines. Sunflower University Press. ISBN 0-07-058472-9.
  4. "Menasco Pirate" (PDF). Retrieved 2011-05-26.
  • Gunston, Bill (1986). World Encyclopedia of Aero Engines. Wellingborough: Patrick Stephens. p. 115.
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