Blake,
Wow--that is a lot of wear. What would you suppose was the reasoning
that caused the piston maker to use two oil-control rings? Doing an
engine rebuild because of two oil control rings to save a few quarts of
oil between rebuilds doesn't make economic sense to me. Does any
manufacturer use two of them these days?
Bob
On Thu, 28 Aug 2003 14:29:37 -0500 Bullwinkle <yd3@nvc.net> writes:
> Bob:
>
> Back when I was participating in NEMGTR marathons we experienced
> very high bore wear one year when using four ring pistons. The engine
> needed a 0.020" overbore in about 6,000 miles of high speed driving. I
> attribute the excessive wear to the use of the 4 ring pistons from a
> major supplier which had two oil control rings. The engine was
> sleeved back to standard and three ring forged pistons used. I've
> experience no problems yet in the 40,000 miles since then. That's
probably due to
> the better metallurgy in the sleeves and the use of the three ring
> pistons.
>
> Blake
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