Mitsubishi Kasei

The Mitsubishi Kasei, whose name means Mars, was a two-row, 14-cylinder air-cooled radial engine built by Mitsubishi Heavy Industries and used in a variety of World War II Japanese aircraft, among them the Mitsubishi G4M and the Mitsubishi J2M. While it was an experimental project Mitsubishi called it the A10, in service it was the MK4, and the Army knew it as the Ha-101 and Ha-111 while the Navy called it Kasei. The unified designation code for models 11 to 27 was Ha-32. Although it was originally ordered by the Imperial Japanese Navy, it was based on the earlier Mitsubishi Shinten, itself derived from the Kinsei, and the Army later adopted it as the Ha-101. Output began at 1,530 horsepower (1,140 kW) and rose to 1,850 horsepower (1,380 kW) in later wartime versions. Its diameter of 1,322 millimetres, against 1,180 millimetres for the Nakajima Homare, made it a challenging engine to fit in single-engine fighters.