Quote:
Originally Posted by Mulletwagon
Is there an accepted or practical maximum compression ratio for Model As beyond which will result in exceeding design limits of internal engine components and cooling/lubrication systems ?
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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.