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Quote:
Originally Posted by Pete
The PRACTICAL limit is usually determined by the octane of the gas you run.
The design limit of the parts and the cooling system are way beyond what they can be stressed by raising the compression alone. I have run 10 to 1 in street model B flathead engines. 14 to 1 flathead model B on alcohol.
It was common for overhead valve conversion model B race engines in the old days to run 15 to 1 on alcohol. That was with babbit bearings.
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WOW, learn something every day.