Quote:
Originally Posted by Werner
Guten Tag Richard.
if you divide the displacement of the cylinder by the volume of the combustion chamber, the result is the compression ratio.
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I am unsure where that mindset comes from, but I don't believe your advice is accurate based on my experiences in the machine shop. Piston protrusion, piston top ring location, compressed head gasket thickness, etc. typically must be accounted for when doing the calculation.
But for the sake of discussion, let's take a stock 201 cubic inch displacement, ...and a 0.125" overbore for comparison using your formula. With a stock bore and a 182cc combustion chamber in the head, your formula would net a compression ratio of around 3.62 to 1, ...and a dismal 3.42 to 1 on the 4.000" bore engine. That is even less than what the Model-T had!!
