DIFERENCE: Diesel Cycle vrs. Otto Cycle The diesel engines are often slow crankshaft speeds of 100 to 750 rpm, while gasoline engines work from 2,500 to 5,000 rpm. are generally heavier than gasoline engines, but this disadvantage is offset by greater efficiency and the fact that use cheaper fuels.
The diesel engine has no spark, take the air and compresses it, and then injects the fuel directly into the combustion chamber (direct injection). It's the heat of the compressed air which ignites the fuel in a diesel engine.
The injector must be capable of withstanding temperature and pressure inside the cylinder and put the fuel. Keep the power fluid circulating cylinder is a problem, so the high- efficiency diesel engines using special induction valves.
The diesel engine fuel injected directly into the cylinder, and is injected through a part of the clash of power. This technique improves the efficiency of the diesel engine over the gasoline engine.