Re: pistons and ring question

Posted by davpal on December 05, 2006 at 22:18:31 from (216.93.94.238):

In Reply to: pistons and ring question posted by dx29 on December 05, 2006 at 11:33:33:

I think you might mean something different than you are saying. If you still have standard pistons then you don't have a .045 oversized cylinder because you would be able to see about 1/16 of an inch of daylight between the block and the piston and the tractor would not even run. 45 thousandths is quite a big overbore. I would bet your machinist meant .0045 which is four and a half thousandths. That would be about the right piston to bore clearance. That is why engine builders get sizes like 4.035 and 4.065 and 4.005 so they can file fit the rings to the correct bore size. A lot of race engine builders like the extra .005 thousandths on there to custom finish it. In other words, yes the piston needs to match the bore size too! Good luck.

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