The compression ratio determines how much the air and fuel are compressed on the compression stroke.

Question

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The compression ratio is defined as the ratio of the total volume of the cylinder when the piston is at the bottom of its stroke to the volume of the cylinder when the piston is at the top of its compression stroke. A higher compression ratio means that the air and fuel are compressed more, which can result in better engine efficiency and performance.

The Compression Ratio Determines How Much the Air and Fuel