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The Junkers Jumo 222 Aircraft Engine

The Junkers Jumo 222 first ran in 1939 and was a very unusual star design, it had six banks of cylinders in a radial pattern at a relative angle of 60 to each other. This high performance compact water cooled engine never reached a true production level with only 289 engines being produced. War time constraints made it necessary to continue to produce older, simpler designs. The engine pictured here is a Junkers Jumo 222e which was produced in 1944.

Junkers Jumo 222E Aircraft Engine

 

As the "Bomber B" program, which had been intended to create second-generation high-speed bomber designs to replace all medium and heavy bombers in service with the Luftwaffe, relied totally on the Junkers Jumo 222, all the new bomber designs were scraped at the same time as the engine.

Junkers Jumo 222A Specifications:

  • Type: 24-cylinder supercharged liquid-cooled "star" (six banks of four cylinders) aircraft engine
  • Bore: 135 mm (5.3 in)
  • Stroke: 135 mm (5.3 in)
  • Displacement: 46.5 L (2,830 in)
  • Length: 2,400 mm (94.5 in)
  • Diameter: 1,160 mm (45.7 in)
  • Dry weight: 1,088 kg (2,399 lb)
  • Valve-train: Two intake valves and one sodium-cooled exhaust valve per cylinder
  • Supercharger: Single-stage two-speed centrifugal type supercharger
  • Fuel system: Fuel injection
  • Cooling system: Liquid-cooled
  • Maximum Power output: 1,838 kW (2,465 hp) at 3,200 rpm
  • Compression ratio: 6.5:1
  • Specific fuel consumption: 0.29 kg/(kWh) (0.477 lb/(hph))
 

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