Re: Ignition advance
The advance depends on a number of factors. The compression ratio is one. Also the turbulence, design of the combustion chamber, and the squish area gap (should be 1/16 inch). An easy way to find the optimum advance is to run the engine at a high idle speed, about 1,000 rpm, and advance the ignition until further advance does not increase the rpm. That is the knee in the advance curve. Of course, in actual driving, the advance will change depending on the conditions, like going up a grade.
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