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In an internal combustion engine, there are cylinders that have pistons in them. When the piston is down you have an open cylinder that has a specific size of volume that it will hold. When the piston moves back up to as high as it can, it compresses all that space into the new space and that is the compression ratio.

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Q: What does compression ratio mean in car motors?
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As a car gets older will its compression ratio change?

Yes, as a car gets older its compression ratio will change. This is because the rings within the car will gradually age and rust.


How do you increase the compression ratio of a 1996 Chevy caprice94-96 Chevrolet caprice 9c1 police package car?

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Depends on the car. If it is naturally aspirated (no turbo or supercharger), then it's easy. Cylinder pressure = 14.5 (1 bar) * Compression Ratio. If however, it's forced induction: Cylinder pressure = ( 14.5 (1 bar) + Boost psi ) * Compression Ratio. For instance, in a naturally aspirated car with a 10.0:1 Compression Ratio : 145 psi = 14.5 * 10 Or in a turbo car with the unreasonably high 10.0 compression ratio with 10 psi boost : 245 psi= ( 14.5 + 10 ) * 10


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It means that it was built by the Pontiac division of General Motors.


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What is the difference between crown motors and regular motors?

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