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Hiro Type 90
Hiro Type 91


The Hiro Type 91, (full designation Hiro Type 91 520 hp water-cooled W-12), was a 12-cylinder, water-cooled, W engine developed for aircraft use by the Imperial Japanese Navy in the mid-1930s. Power was in the 450 kW (600 hp) range. Its design was inspired by the Lorraine-Dietrich 12Eb Courlis. An enlarged more powerful engine, the Type 90 had also been developed using the Lorraine 12F Courlis as inspiration, developing 600 hp.


Aichi E10A
Aichi E11A
Hiro H4H
Kawanishi E7K
Mitsubishi Ka-9


Type 91 500hp-1
Type: 12-cylinder water-cooled W-block (3 banks of 4 cylinders) aircraft piston engine
Bore: 135 mm
Stroke: 160 mm
Displacement: 27.5 L
Cooling system: Liquid-cooled
Power output:
620 PS for takeoff
520 hp for max continuous



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