Originally Posted by
39erman
Seriously? Using 9k is not a huge issue on stock cast pistons if it only occurs once or twice a lap. 8.8k is safe'ish until the engine starts to wear and lubrication/cooling of the piston/bore starts to fade a tad then BINGO!
Lights out time! Nothing wrong with ITR/CTR pistons if you keep the revs to a reasonable 8.8k and the engine is not starting to get tired.
Realistically how often in a lap would you really use 9k? On the main straight, yes, once, otherwise, what's the point?