Daimler-Benz DB 604

The DB 604 was a German aircraft engine from Daimler -Benz. It was a water-cooled 24 -cylinder X - engine, in which the angle between the cylinder banks 90 ° amounted to ( symmetric), so it should be classified better than row radial engine. He was one of the largest and most powerful German aircraft engines.

During the Second World War he was developed as a possible drive for the "Bomber B " project. His two competitors for this task were the Junkers Jumo zylindrige also 24 222 and the 18- zylindrige BMW 802 Since its development was discontinued in September 1942, but he never made it into mass production.

The DB 604 was arranged behind one another ( in series) a water-cooled, supercharged 24 -cylinder radial engine with six 4 -cylinder Stars. Its crankshaft was six times cranked - for each of the six four- star once. The offset angle of the individual offsets were as in -line six cylinder 0 °, 120 °, 240 °, 240 °, 120 °, 0 °. So even firing intervals were reached ( every 30 ° of crankshaft rotation ignition ).

There are few examples of other symmetrical X24 motors ( = row radial engines with six 4- stars ). They include the 2,000 hp Rolls- Royce Vulture and 1,500 hp Allison X -4520 with 74 liter capacity from the year 1928.

Specifications

  • Engine type: Water-cooled 24 -cylinder radial engine ( 6 x 4 - stars)
  • Stroke: 135.0 mm
  • Bore: 135.0 mm
  • Displacement: 46 376 cm ³
  • Power: 1,955 kW ( 2,660 hp) at 3.200/min
  • Specific output: 57.4 bhp / liter
  • Piston speed: 14.40 m / s
  • Compression ratio: 7.0:1
  • Mass: 1080 kg
  • Power to weight ratio: 0.41 kg / hp
Daimler-Benz Rolls-Royce Vulture Lycoming XR-7755
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