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piston to cylinder wall gap, how much is too much??

11K views 10 replies 7 participants last post by  siderbox 
#1 ·
ok so i blew my top end again, time for another rebuild... i was just curious about when i get it bored how much they should bore it? what is exceptable piston to cylinder clearance on a 240 big bore with a wiesco forged piston... i talked to vito's and the said 3 to 3 1/2 thousandths ... does that seem right?
 
#7 ·
Id run what it says for the piston.
 
#8 ·
even with 3 thousandths clearence, my piston seems to make quite a bit of noise. The more metal, the more it will expand, so the bigger piston the looser it needs to be. 3 thousandths has worked for me, but thats because i have let it have plenty of time for break in, because thats pretty tight.
 
#10 ·
You know, I hear that alot of the guys that run sabre cylinders are running clearances from .007 to as much as .010. I cant imagine being that loose but, those are the guys that are winning, of course they also have the cash to spend when things go bad.
 
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