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 Ha112Unified designation code was Ha-33.
Cylinder and detail design was based on the single-row, 9-cylinder air-cooled Pratt and WhitneyR-1689 Hornet, but underwent numerous modifications and improvements.