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The compression-igntion engine Combustion chamber Designed topromote turbulenceso that the fuel andair are well mixed. Bottom end The main parts ofthe engine need tobe stronger thanpetrol equivalents. Connecting rod Piston Ignition No sparkplugs are neededbecause the mixtureis ignited bycompression heat. Glow plugs Thesepreheat thecombustion chamberfor 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.