Menasco C-4 Pirate.jpg
Type Piston aero engine
National origin United States
Manufacturer Menasco Motors Company
First run 1930s
Major applications Great Lakes 2T-1MS
Ryan ST

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]


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[citation needed]
Menasco L-365-3
similar to -1 but changes to cylinder heads, lubrication and carburettor[citation needed]


Specifications (Menasco C4S Pirate)

General characteristics



See also

Comparable engines

Related lists


  1. ^ "Menasco Pirate". www.bombercommandmuseum.ca. 2011. Retrieved May 26, 2011.
  2. ^ Parker, Dana T. Building Victory: Aircraft Manufacturing in the Los Angeles Area in World War II, pp. 122–24, Cypress, CA, 2013.
  3. ^ a b c d Herschel, Smith. (1986). A History of Aircraft Piston Engines. Sunflower University Press. ISBN 0-07-058472-9.
  4. ^ a b c "Menasco Pirate" (PDF). rgl.faa.gov. Retrieved May 26, 2011.