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Mitsubishi Kinsei

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Title: Mitsubishi Kinsei  
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Subject: Mitsubishi Shinten, Mitsubishi Zuisei, Nakajima Kotobuki, Nakajima Mamoru, Kawasaki Ha40
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Mitsubishi Kinsei

Type Piston aircraft engine
National origin Japan
Manufacturer Mitsubishi Heavy Industries
First run 1934
Major applications Aichi D3A
Mitsubishi A6M8
Number built 12,228
Developed from Pratt & Whitney R-1690 Hornet
Developed into Mitsubishi Zuisei, Mitsubishi Kasei, Ha-43(Ha-211)

The Mitsubishi Kinsei (金星 Venus) was a 14-cylinder, air-cooled, twin-row radial aircraft engine developed by Mitsubishi Heavy Industries in Japan in 1934 for the Imperial Japanese Navy. The Mitsubishi model designation for this engine was A8 while it was an experimental project, in service it was known as the MK8 "Kinsei" by the Navy. In the middle of the war the engine was adopted by Army so it got designation Ha112[1]Unified designation code was Ha-33.

Cylinder and detail design was based on the single-row, 9-cylinder air-cooled Pratt and Whitney R-1689 Hornet, but underwent numerous modifications and improvements.[2]


  • -3 - 910 hp
  • -41 - 1,075 hp
  • -42 - 1,075 hp
  • -43 - 1,000 hp, 1,080 hp
  • -44 - 1,000 hp, 1,075 hp
  • -45 - 1,075 hp
  • -46 - 1,070 hp
  • -48 - 1,080 hp
  • -51 - 1,300 hp
  • -53 - 1,300 hp
  • -54 - 1,200 hp, 1,300 hp
  • -62 - 1,560 hp


Specifications (Kinsei-44)

Data from Jane's.[3]

General characteristics

  • Type: 14-cylinder air-cooled twin-row radial engine
  • Bore: 140 mm (5.5 in)
  • Stroke: 150 mm (5.9 in)
  • Displacement: 32.3 L (1,970 cu in)
  • Length: 1,646 mm (64.8 in)
  • Diameter: 1,218 mm (48.0 in)
  • Dry weight: 545 kg (1,202 lb)


  • Valvetrain: Overhead valve, one inlet and one exhaust valve per cylinder, pushrod operated.
  • Supercharger: Centrifugal, single speed.
  • Oil system: Triple section pump, one pressure pump, two scavenge pumps.
  • Cooling system: Air-cooled
  • Reduction gear: Planetary gear, 0.7:1 ratio.


See also

Related development
Comparable engines
Related lists



  1. ^ Gunston 1989, p.104.
  2. ^ Peattie, Mark R., Sunburst: The Rise of Japanese Naval Air Power 1909-1941, Annapolis, Maryland: Naval Institute Press, 2001, ISBN 1-55750-432-6, p. 308.
  3. ^ Jane's 1989, p.298.


  • Matsuoka Hisamitsu, Nakanishi Masayoshi. The History of Mitsubishi Aero Engines 1915-1945. Miki Press, Japan, 2005. ISBN 4-89522-461-9
  • Gunston, Bill. World Encyclopaedia of Aero Engines. Cambridge, England. Patrick Stephens Limited, 1989. ISBN 1-85260-163-9
  • Jane's Fighting Aircraft of World War II. London. Studio Editions Ltd, 1989. ISBN 0-517-67964-7
  • Peattie, Mark R., Sunburst: The Rise of Japanese Naval Air Power 1909-1941, Annapolis, Maryland: Naval Institute Press, 2001, ISBN 1-55750-432-6
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