How much honing can be done before....
08-22-2002, 04:06 PM
#1
Staging Lane
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Join Date: Feb 2002
Location: Knoxville TN
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How much honing can be done before.... you have to go oversize rings?
the bore is 3.900" right, can it go to 3.910" and still use stock size, if not what is the maximun the bore can be and the stock size rings would still work?
Thanks
the bore is 3.900" right, can it go to 3.910" and still use stock size, if not what is the maximun the bore can be and the stock size rings would still work?
Thanks
08-22-2002, 06:10 PM
#2
TECH Fanatic
Re: How much honing can be done before.... You need to be concerned with piston to bore fit.
If stock is .002-.003 clearance on the diameter (I'm too lazy to look it up now), and a forged race piston needs .005 to .006 clearance, honing a stock cylinder .010 oversize wouldn't work at all, even with oversize rings. With stock size pistons you'd have piston slap, and the piston would rock in the bore and probably scuff. Bad news.
Ring gap is measured along the circumference of the ring. Because circumference = Pi(3.1415) x diameter, every .001 change in diameter is about .003 change in circumference, so going .010 over would increase the circumference (and the stock ring gap) by .031. Also bad news.
That's the reason pistons and rings are sold in .010, .020, .030 inch (.25, .50, .75 mm) oversizes.
Sometimes a race engine which has not scuffed a piston or scored the bore can be "freshened" by just deglazing the cylinder and putting the desired surface finish on it without removing more than .0005 to .001 on the diameter. In that case the original size pistons and (new) rings can work.
If stock is .002-.003 clearance on the diameter (I'm too lazy to look it up now), and a forged race piston needs .005 to .006 clearance, honing a stock cylinder .010 oversize wouldn't work at all, even with oversize rings. With stock size pistons you'd have piston slap, and the piston would rock in the bore and probably scuff. Bad news.
Ring gap is measured along the circumference of the ring. Because circumference = Pi(3.1415) x diameter, every .001 change in diameter is about .003 change in circumference, so going .010 over would increase the circumference (and the stock ring gap) by .031. Also bad news.
That's the reason pistons and rings are sold in .010, .020, .030 inch (.25, .50, .75 mm) oversizes.
Sometimes a race engine which has not scuffed a piston or scored the bore can be "freshened" by just deglazing the cylinder and putting the desired surface finish on it without removing more than .0005 to .001 on the diameter. In that case the original size pistons and (new) rings can work.
