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#18
12-31-2021, 07:20 AM
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In a nut shell that effect / action is due to the expansion ratio.
We are all too use to looking at the compression ratio and the pistons travel up the bore. The thermo dynamics involved in the expansion ratio looks at residual heat left over once the crank has rotated passed the point where it can still use that heat to power it. A high compression motor burns its inhaled air and fuel much faster then a low compression one and Is why less total advance is needed as compared to a low compression motor. The post last week of the W72 400 motor build and the 42 degrees of timing that was employed is a clear cut example of this!
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