Piston ring material

Piston ring material

Just wornding what piston ring material would be best for me the engine is a gen iv bbc with a 4.530 bore and dart iron eagle heads. Most cylinders are and pretty good shape but a few have minor scuffs and I don't have the tools for measuring out of round nit going to a machine shop as where I live in canada they are way over priced as there's very few so I ordered cast rings because of this but they accidentally sent moly ones and I heard u want a 100% perfect finish for moly rings am I best to send em back and get cast? That and I already Honed it at 220 or 240 grit

These are the rings they sent me

Piston Rings, Premium Ductile Ring Sets, Plasma-moly, 1/16 in., 1/16 in., 3/16 in. Thickness, 8-cylinder, Set of 8

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Last edited by 502nova3; 06-11- at

04:10 PM

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Post by Eagle » Sat Jan 28, 3:49 am

Dear Nate,
Dear Dcal,
Dear Modok,
Dear engineguyBill,

Many many thanks for all your replies.
Now, it is very very clear to me.
If I am using any forged brand ( which I do use for the competition engines ), they do come with NPR or NPR type nitrided steel rings. I understand from your explanations that as long as I am getting the honing correct it would not matter if the cylinder is plain or ductile iron sleeved. This is a relief for me since I was on the correct direction.
For me, more challenging part was the choice of cast pistons with rather thick rings combinations. I now understand that if there is a Moly faced ring option is available, I better opt for Moly face that rather than the plain or ductile iron rings. Chrome faced rings should better be avoided for my type of builds.
Also, if I did understand correct, if available, I would better use thinnest possible ring combination on the cast pistons as well. It seems that, nowadays, some aftermarket cast piston manufacturers also redesigning their pistons for rather thinner rings than the original heavy and thick rings. To find suc a piston for the application is certainly beneficial.
Again, many many thanks to you all.
All the best,
Kerem

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