The Atsuta 31 was a licensed version of the Daimler-Benz DB 601A liquid-cooled, inverted V-12 engine. The Atsuta reduced an aircraft's frontal area, increasing aerodynamic efficiency. Aichi manufactured 873 Atsuta series engines during World War II.
The Atsuta was the only liquid-cooled engine used operationally by the Japanese naval air force. The Ha 60 Model 31 powered the Aichi M6A1 Seiran, a submarine-borne floatplane bomber, and early versions of the Yokosuka D4Y2 series Suisei carrier-based dive bomber and reconnaissance aircraft.
Transferred from the U.S. Navy, Naval Supply Center, Norfolk, Virginia.
Country of Origin: Japan
Length 215.0 cm (84 5/8 in.), Width 71.2 cm (28 1/16 in.), Height 106.0 cm (41 3/4 in.)
Bearings - Steel backed copper lead
Crankshaft - Ni/Cr Steel
Cylinder blocks - Silicon aluminum alloy
Ignition leads - Fabric covered
Pistons - Similar to 24S aluminum
Type: Inverted V, 12 cylinders, liquid cooled, supercharged, fuel injected
Power rating: 1,044 kW (1,400 hp) at 2,800 rpm
Displacement: 33.9 L (2,069 cu in)
Weight: 715 kg (1,576 lb)
Manufacturer: Aichi Aircraft Co., Japan
Missing generator and exhaust manifold; has nearly all rear case accessories. (Generator A19601831000 installed 6/6/2001).