assuming the same thickness and overall diameter of the pistons, you can probably compare them using the formula for calculating the area of a circle (pi * r^2). sum the area that the oil will flow through and that should be ballpark.
if you're switching between piston mfrs, things like the edge radius and hole tapers can affect the dampening as well, and are much tougher to calculate/predict.
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assuming the same thickness and overall diameter of the pistons, you can probably compare them using the formula for calculating the area of a circle (pi * r^2). sum the area that the oil will flow through and that should be ballpark.
if you're switching between piston mfrs, things like the edge radius and hole tapers can affect the dampening as well, and are much tougher to calculate/predict.
So do you mean like this?
I am running Tamiya 4 hole pistons bored out to 1.4mm.
(3.1416*1.4^2)*4 = 24.63 square mm?
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