piston rings....
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 420
From: Long Island USA
Moly rings can take a bit longer to seat, and the finish of the bore has to match whichever ring you're using.
They do, however, hold up to heat and abuse (high RPM) much better than cast.
I could be wrong though, it's been about 20 years since I had that conversation with my machinist, and not only do "acceptable practices" change over time, but my memory of personal conversations can, shall we way, change
Some info from Federal Mogul: Federal-Mogul - Sealed Power Piston Rings
Would love to have other people chime in on this subject.
They do, however, hold up to heat and abuse (high RPM) much better than cast.
I could be wrong though, it's been about 20 years since I had that conversation with my machinist, and not only do "acceptable practices" change over time, but my memory of personal conversations can, shall we way, change
Some info from Federal Mogul: Federal-Mogul - Sealed Power Piston Rings
Would love to have other people chime in on this subject.
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Laughing Gas
Joined: Jul 2004
Posts: 783
Likes: 0
I was kinda leaning towards moly but i wasn't sure. This would be a fresh rebuild not just a re-ring so the hone job wouldn't be an issue as it will be finished for either. I'll have to ask the opinion of the race shop that will probably be doing the work and see what they say also. My main thing is If I save 50.00 and lose 5-10 hp (just a random number) Its really not worth me saving the 50.00 and since this will be used mostly for a sled pull truck i think moly might be the way to go.
Post Fiend
Joined: Sep 2006
Posts: 14,325
Likes: 14
From: Island Southeast Alaska
I like Cast. My experience with Moly was not good. Part of that was the customers not following the break in procedures. That and I have never broke a cast ring installing it on a piston. So unless it is all out racing of some kind I use cast.
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Laughing Gas
Joined: Jul 2004
Posts: 783
Likes: 0
I havn't really read anything about the gapless rings? Thoughts?
It would be for a street sled puller. Mostly the only time it will be driven is to and from a pull. So longetivity isn't a big concern as it will only see 3000 miles or less a year. But i do want to get as much out of the rings HP wise as i can.
It would be for a street sled puller. Mostly the only time it will be driven is to and from a pull. So longetivity isn't a big concern as it will only see 3000 miles or less a year. But i do want to get as much out of the rings HP wise as i can.
