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On 22 Jun 2001, at 11:32, Mike Wodkowski wrote: > For us learners: what is exactly is being compared in a compression ratio? > What's being compressed and what does it all mean? It's the ratio between the volume of gas/air in the cylinder when the piston is at the bottom of its stroke to the volume when the piston is at the top of its stroke. Kind of like a before and after (compression) comparison. Compressing the mix heats it and gets it ready to ignite. If you compress it too much it ignites itself. The latter is knock, detonation, etc (all words for various degrees of the same thing) and these are bad things for your engine. - Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe