Because this has become so critical, knowing how to accurately determine the true compression ratio of an engine is essential. That's what this Back To Basics segment is about.

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An engine's compression ratio is actually a theoretical number. This ratio compares the cylinder volume of the piston at bottom dead center (BDC) versus top dead center (TDC).

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But too high a ratio causes knocking—premature detonation of fuel-air mixture during the engine's compression stroke caused by high cylinder temperatures.