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The compression-igntion engine

The compression-igntion engine Combustion chamber Designed to promote turbulence so that the fuel and air are well mixed. Bottom end The main parts of the engine need to be stronger than petrol equivalents. Connecting rod Piston Ignition No spark plugs are needed because the mixture is ignited by compression heat. Glow plugs These preheat the combustion chamber for cold starts. Bearing cap Bracing web

Many car diesels are based on existing petrol engine designs, but with the major components strengthened to cope with the higher pressures involved.

Fuel is supplied by an injection pump and metering unit, which are usually mounted on the side of the engine block. No electric ignition system is needed.