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Fuel and air are combined, compressed by pistons, and ignited in a gasoline engine by spark plugs. However, with a diesel engine, the fuel is injected after the air has been compressed.
Diesel and gasoline engines are conceptually pretty similar. Both have internal combustion engines that use the chemical energy in fuel to produce mechanical energy. Inside cylinders, this mechanical energy drives pistons up and down. The up-and-down motion of the pistons, known as linear motion, produces the rotational motion required to spin a car's wheels forward. The pistons are attached to a crankshaft.
Diesel and gasoline engines both use a series of small explosions, or combustions, to turn fuel into energy. The manner in which these explosions take place is a key distinction between diesel and gasoline. Fuel and air are combined, compressed by pistons, and ignited in a gasoline engine by spark plugs. However, with a diesel engine, the fuel is injected after the air has been compressed. Compressed air heats up, which causes the fuel to ignite.
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