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 Ha-112. Unified designation code was Ha-33. Its basic design was based on the single-row, 9-cylinder air-cooled Pratt and Whitney R-1689 Hornet, but underwent numerous modifications and improvements.
First run in 1934, a total of 12,228 were built.
-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
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.
Power output: 1,075 hp (802 kW) at 2,500 rpm at 2,000 m (6,560 ft) maximum.
Specific power: 0.56 hp/cu in (24.8 kW/L)
Compression ratio: 6.6:1
Power-to-weight ratio: 0.9 hp/lb (1.5 kW/kg)