We get what you mean roger however I would say the shape of the piston is forcing more oil around the piston rather than though a very slightly oval hole and this is why they seem to rebound quicker. Ive also done some back to back piston runs they both produced pretty much the same lap times but the tapperd IMO feel less consistant.
I would say don't waist your money on tapperd pistons unless your are at the top of the time sheets where those drivers can really tell the difference.
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