A Petrol engine or Gasoline engine is an internal combustion engine with spark ignition designed to run the car vehicles on petrol (gasoline) and similar volatile fuels. The automobile models differ 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 by automobile accessories before compression. The pre mixing was formerly done in a carburettor but now it is done by electronically-controlled fuel injection.
Applications
Petrol engines have many applications in new automobiles, including motor cars, motorcycles, aircraft, motorboats and small machines, such as lawn mowers, chainsaws and portable Engine-generators
In auto transportation, petrol engines may run on the four-stroke cycle or the two-stroke cycle.
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