A Petrol engine or Gasoline engine is an
internal combustion engine with
spark-ignition designed to run on petrol (
gasoline) and similar volatile fuels. It differs from a
diesel engine in the method of mixing the fuel and air, and in the fact that it uses
spark plugs. In a diesel engine, merely the air is compressed, and the fuel is injected at the end of the compression stroke. In a petrol engine, the fuel and air are pre-mixed before compression. The pre-mixing was formerly done in a
carburettor but now (except in the smallest engines) it is done by electronically-controlled
fuel injection. Pre-mixing of fuel and air allows a petrol engine to run at a much higher speed than a diesel, but severely limits their compression, and thus efficiency .
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