Quote:
Originally Posted by Mike Graham
The particular engine that I had trouble with Had Total seal AP rings the first time and Ackerly and childs moly the second time. I have used both brands of rings many times with no issues. Hone on this guy was 820 . The only thing we changed was to have the pistons coated. The engine ran fine but was ready for re ring. Same hone same ring pack. The only thing changed was coated pistons. Engine ran good for about 10 passes then fell off a tenth. Everytime we would leak it leakage would change. Second rings were trashed. Re honed and re ringed.Same results. I have done more than a few stock and ss engines and never had a problem like this before or after. Like I said, the only thing that was changed was coating. I think the coating on this particular set of pistons was too soft and it sloughed off. I did 2 other builds with this coating without problems. I didn't see any gains,but it didn't trash the rings.
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Mike i would call Carl at poly dyn used his coating for years never had a problem. 2818946382