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The Zvezda M503 was a maritime 7 bank, 42 cylinder diesel radial engine built in the 1970s by the Soviet Union. Its primary use was in Soviet missile boats that used three of these engines.

This engine may have had other applications, but due to its extreme weight (5,400 kg (11,900 lb)), it would have been limited to ground or naval applications.

A German tractor pulling team designed a vehicle, named "Dragon Fire", around a methanol-fueled version of this engine;[1] this modified[2] engine is said to weigh 3,200 kg (7,100 lb) including the gearbox, for use in the 4.5 ton tractor pulling class, making 8,000 hp (6,000 kW) at 2,500 rpm.

Specifications (Zvezda M503A)[edit]

Zvezda M503

General characteristics

  • Type: 42-cylinder liquid-cooled seven-bank, six-cylinder-per-bank diesel radial engine
  • Bore: 160 millimetres (6.3 in)
  • Stroke: 170 millimetres (6.7 in)
  • Displacement: 143.6 litres (8,760 cu in) (8,763 in³)
  • Length: 3,700 millimetres (150 in) (145.66 in)
  • Diameter: 1,560 millimetres (61 in) (61.41 in)
  • Dry weight: 5,450 kilograms (12,020 lb) (12,015 lb) (dry)



  • Power output: 3,942 bhp (2,940 kW, 3,997 PS) at 2,200 rpm
  • Specific power: 20.47 kilowatts per litre (0.450 hp/in3)
  • Power-to-weight ratio: 0.53 kilowatts per kilogram (0.32 hp/lb)

Comparable engines[edit]


  1. ^ "Archived copy". Archived from the original on July 26, 2010. Retrieved May 16, 2010. 
  2. ^[permanent dead link]

Translated from : German Wikipedia


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