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A gasoline engine intakes a mixture of gas and air, compresses it and ignites the mixture with a spark. A diesel engine takes in just air, compresses it and then injects fuel into the compressed air. The heat of the compressed air lights the fuel spontaneously. A diesel has not spark plugs. A gasoline engine compresses at a ratio of 8:1 to 12:1, while a diesel engine compresses at a ratio of 14:1 to as high as 25:1. The higher compression ratio of the diesel engine leads to better efficiency. Because of the higher compression ration, a diesel is built with much stronger components and tends to last much longer than a gasoline engine. Diesel fuel is a combustable, meaning that heat and pressure create an explosion, Lamp oil and Jet fuel are also combustables, diesles can opperate on about any combustable liquid if nessisary. Unleaded Gas is a flamable, meaning an open flame or spark causes an explosion, alcohol and propane are flamable as well but gas engines need some modifications to run on them.

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Q: What is the difference between a diesel and an unleaded engine?
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