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Any combustion needs Fuel, Oxygen and heat.

In a petrol engine, the fuel and air are mixed in either a carburettor, or a fuel injector system. The heat is supplied by the spark plug and maintained once the mixture is burning rapidly. The massive expansion of the burning gas, is used to push the piston.

In a CI (compression ignition diesel) engine, The air is drawn in, diesel fuel is sprayed into it and the piston compresses it. This compression alone, causes heat, which is enough to cause combustion. The same expansion of the burning gas, is used to do work on the piston.

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