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The compression ratio is the ratio of the volume of the cylinder and the combustion chamber when the piston is at the bottom, and the volume of the combustion chamber when the piston is at the top. Automotive engineers can improve fuel efficiency and fuel economy by designing engines with high compression ratios.
The ratio between the index of secondary compression CÎ± and the compression index Cc is approximately constant for most of the normally consolidated clays for load typical in engineering practice. Its average value is 0.05.