JSC Zvezda M503
Encyclopedia
The Zvezda M503 was a maritime 6 row, 42 cylinder diesel
Diesel engine
A diesel engine is an internal combustion engine that uses the heat of compression to initiate ignition to burn the fuel, which is injected into the combustion chamber...

 radial engine
Radial engine
The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders point outward from a central crankshaft like the spokes on a wheel...

 built in the 1970s by the Soviet Union. Its primary use was in Soviet missile boats, which used three of these engines.

This engine may have had other applications, but due to its extreme weight (12000 lb (5,443.1 kg)), it would have been limited to ground or naval applications.

A German tractor pulling
Tractor pulling
Truck and Tractor pulling, also known as power pulling, is a motorsport competition, popular in America, Europe , Australia and Brazil, which requires modified tractors to pull a heavy sledge along a 35ft. wide and length of 100 metre or 300ft+ track, with the winner being the tractor that pulls...

 team designed a vehicle around a methanol-fueled version of this engine, this modified engine is said to weigh 3200 kg (7,054.8 lb) including the gearbox, for use in the 5.4 ton tractor pulling
Tractor pulling
Truck and Tractor pulling, also known as power pulling, is a motorsport competition, popular in America, Europe , Australia and Brazil, which requires modified tractors to pull a heavy sledge along a 35ft. wide and length of 100 metre or 300ft+ track, with the winner being the tractor that pulls...

 class, making 8000 hp at 2,500 rpm.

Specifications (Zvezda M503A)

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