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Mitsubishi was the first and largest series producer of Japanese engines during World War II, with a 1937 Pratt & Whitney arrangement possibly contributing to this success. The Kasei (Mars) was the largest of the manufacturer’s original 14-cylinder radials, and was widely used in various models. It was geared, supercharged, and had optional water methanol injection. Between 1941 and 1945, a total of 9,323 engines of all models of Kasei 20 series were manufactured.

This Model 21 powered the Mitsubishi G4M twin engine attack bomber (Allied Code Name Betty) built in larger numbers than any other Japanese bomber; it was used from the beginning of the war and also transported the Japanese surrender delegation. A total of 2,446 G4M and the similar G6M1 aircraft were built.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Date Circa World War II Country of Origin Japan Type PROPULSION-Reciprocating & Rotary Manufacturer Mitsubishi Jukogyo K. K.
 Physical Description Type: Reciprocating, 14 cylinders, 2 rows, radial, air cooled Power rating: 1,141 kW (1,530 hp) at 2,450 rpm Displacement: 42.1 L (2,570 cu in.) Bore and Stroke: 150 mm (5.91 in.) x 170 mm (6.69 in.) Weight: 725 kg (1,598 lb) Missing generator, magneto caps, data plate, exhaust manifold; intake dented. Imperial Japanese Navy Dimensions Diameter 134 cm (52.75 in.), Length 170.5 cm (67.125 in.)
 Materials Steel, Aluminum, Textile, Leather, Rubber, Preservative coating, Copper, Paint, Magnesium
 Inventory Number A19710048000 Credit Line Transferred from the U.S. Navy, Lakehurst Naval Air Station, Lakehurst, New Jersey Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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