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I'd like to add that mean piston speed, peak piston speed, and piston speed during the first few dozen degrees after TDC (probably most important to us), will all vary based on engine geometry. An engine with a larger rod ratio (reduces sideloading and friction) will increase the dwell time at TDC (possibly good for thermal efficiency?), after which the piston will accelerate downward at a greater rate, compared with another engine that has the same bore and stroke but shorter rods.
I've never really tried to wrap my head around all of the variables at once.
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