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Originally Posted by whtteg
The first # is the chamber volume at BDC, and the 2nd # is the volume at TDC. So the high value the 1st # is the more compressed the air fuel mixture becomes and the higher the cylinder pressure and more complete burn= more hp 
That is a simplified over view, to go into detail would be way too long for me to type.
And the ideal CR for boost is 8.5:1 for real big boost and around 9.0:1 -9.5:1 for smaller boost. |
Here is a simple explanation a third grader could understand.
imagine you have 10.6 glass's of water(BDC), now compress them into one glass(TDC), that is what the numbers mean.