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in 1862 a French person named Alphonse Beau de Rochas invented a 4-step combustion engine.
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You can see how this picture from the 1862 pictue is diffrent .There are diffrent colors.More wires and 1 step combustion engine.
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in this 1984 engine there are now more wires.
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The 2004 cadillac engine is diffrent from the 1862 and the 2015-16 engine .
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There is a big diffrence in the engines like... in the 1862 car engine theres a fan to cool the engine but on this one theres fluid that goes into in to cool it down.
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in this 1990 engine thay got rid of some engines and added some small tubes.