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but I'm not sure how it relates to FE, how to calculate it, or how to use that calculation to help me improve.
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Nor I.
I can say that bore and stroke determine displacement, and stroke and RPM determine piston speed.
Destroking an engine lowers the compression ratio all else equal. Stroking an engine improves low end torque.
It's complicated by things like wrist pin offset.
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https://www.quora.com › What-is-a-piston-pin-offset-Why-is-it-provided?share=1
What is a piston pin offset? Why is it provided? - Quora
One reason why piston pins are sometimes offset is to decrease rod angularity during the power stroke. By offsetting the pin, the rod can be kept slightly more vertical during the power stroke. By keeping the rod as vertical as possible during the time that cylinder pressure is at its highest, piston side loading can be minimized.
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