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Increased auto compression ratios

The compression ratio of today's cars is so much higher than in cars of years past.

a) What is the major advantage of increasing the compression ratio?
b) How must the gasoline change in order to burn smoothly and evenly in engines with higher compression ratios?

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a) One of the strokes is the compression stroke, where the engine compresses a cylinder-full of air and gas into a much smaller volume before igniting it with a spark plug. The amount of ...

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