The theory is that the angular side will move faster through the oil than the flat side. Rather like a F1 cars nose verses my VW T4 front grill! But that is aerodynamics rather the fluiddynamics. The flat side pointing to the top means that you should get more pack and as the tapered side is pointing down then you get a faster rebound. But that is all theory. I think in practise the tapered pistons are also made much better than the mass produced ones and therefore are more consistent and why people like to use them.
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