Quote:
Originally Posted by enkeivette
.007 piston clearance is a .014 larger bore. And .03 sounds dangerously tight to me for forged pistons. I've heard of up to .012 clearance/ .022 larger bore.
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You and I are talking about two different things. I'm talking about the piston to cylinder wall clearance and you're talking about the piston ring gaps.
Quote:
Originally Posted by BRUTAL64
You need .004 of ring gap per inch of bore...probably no need to get over size rings....filing rings will cause brain damage. 
Most over size rings need to be filed to fit correctly.
You DO NOT want the rings ends to butt when hot---that will rip off the top of the piston |
Total Seal rings I bought for the Cobra showed to set the top ring at .0055 x bore, the second ring at .0035 x bore and the oil ring at a minimum of .015 for boosted applications. I set the top rings at .023, the second rings at .016 and the oil rings were .016 out of the box.
The Mahle rings that came with my engine kit were not file fit rings but the end gaps were all over the place. They ranged from .008 up to .016.