Quote:
Originally Posted by basslover911
What do you think would be the max? Or let me ask, what is the engine with the highest compression that you know of?
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Very good question
From Wikipedia
Motorcycle racing engines can use compression ratios as high as 14:1, and it is not uncommon to find motorcycles with compression ratios above 12.0:1 designed for 86 or 87 octane fuel.
The highest I've dealt with was 14.5 to 1. By no means was it an economical engine to operate. It was an older 350 with Vortec heads, and some other goodies. Had to keep ignition settings conservative on pump gas, but not to bad.
Ofcourse the Dynamic compression ratio on many forced induction engines runs in to the 20to1's