Mitsubishi Kasei Aviation Models
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The Mitsubishi Kasei.
The Mitsubishi Kasei was a 14 cylinder, double-row, air-cooled radial engine with horsepower ranging from 1,530 hp (1,140 kW) to 1,850 hp (1,380 kW), depending on the model and configuration. It was the largest aircraft engine available in Japan at the start of the war and one of Japan's most produced and most important engines. It was used in a variety of twin-engine bombers and single-engine fighters that included the Kawanishi E15K, Kawanishi H8K, Kawanishi N1K-J Kiofu, Mitsubishi G4M, Mitsubishi J2M Raiden, Nakajima B6N Tenzan, Yokosuka P1Y Ginga and the Mitsubishi Ki-21.
    The diameter of 52-3/4 inches (134 cm) was rather large for single-engine applications, but it was only slightly larger than the 52 inch (132 cm) Pratt & Whitney R-2800 which was used in a variety of Allied single-engine aircraft. 1

    It was built by Mitsubishi Heavy Industries as the Model A100 and the production version was designated the MK4 and known as the Ha-101 & Ha-111 by the Army and Kasei by the Navy. The Kasei was based on the earlier Mitsubishi Kinsei engine.

    Three variants were developed for the Japanese Navy starting in 1939. It was also later adopted by the Imperial Japanese Army as the Ha-32 engine, and was developed further into four variants, including the Ha-111. Production was 8,596 units of all variants.

Mitsubishi Kasei
Displacement: 2,567 cu. in. (42 liters)
Date: 1937
Cylinders: 14
Configuration: Double-row, air-cooled radial
Horsepower: 1,530 hp (1,140 kW) to
1,850 hp (1,380 kW)
RPM: 2,100
Bore and Stroke: 5.9 in. (150 mm) X
6.7 in. (170 mm)
Diameter: 52.75 inches (134 cm)
Weight: 1,653 lbs. (750 kg)


1. Herschel Smith. A History of Aircraft Piston Engines. Manhattan, Kansas: Sunflower University Press, 1993. 133.
2. Rene J. Francillon, Japanese Aircraft of the Pacific War. Annapolis, Maryland: Naval Institute Press, 1995. 521.

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© Larry Dwyer. The Aviation History Online Museum. All rights reserved.
Created September 3, 2014. Updated December 30, 2022.