Mitsubishi Kasei 25, Ha 32 Model 25, Radial 14 Engine

Type: Reciprocating, 14 cylinders, 2 rows, radial, two-speed supercharger, air-cooled

Power rating: 1,074 kW (1,440 hp) at 2,450 rpm

Displacement: 42.2 L (2,576 cu in.)

Bore and Stroke: 150 mm (5.91 in.) x 170 mm (6.69 in.)

Weight: 730 kg (1,609 lb)

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. Between 1941 and 1945, 9,323 engines of all models of Kasei 20 series were manufactured.

The Kasei 25 incorporated a two-speed supercharger, similar to earlier Kasei 21 and 22 models. It was used in a number of war time aircraft including: 1,133 B6N2 Nakajima Tenzan (Heavenly Mountain) (Allied Code Name Jill) single engine, torpedo-bombers; less than 100 of the night fighter version of the Yokosuka P1Y2 Ginga (Milky Way) (Allied Code Name Frances); two prototypes of the four-engine Kawanishi H8K4 maritime reconnaissance flying-boat; and 1,154 twin-engine Mitsubishi G4M2 (Allied Code Name Betty) attack bombers.