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Piston Rings - Moly, Chrome or Cast?
https://slantsix.org/forum/viewtopic.php?t=18690		 Page 1 of 1
Author:  bwhitejr [ Thu Jul 20, 2006 4:02 pm ]
Post subject:  Piston Rings - Moly, Chrome or Cast?
In a typical performance Slant Six build-up which type of piston ring is prefered? Moly coated, chrome faced or cast iron?

Now, for turbo applications is it different?


bwhitejr
Author:  Dart270 [ Thu Jul 20, 2006 5:46 pm ]
Post subject: 
I have used moly on my motors with good results.

Lou
Author:  CStryker [ Thu Jul 20, 2006 6:22 pm ]
Post subject: 
From what I understand, cast iron rings will work ok, though they're not the most wear or scuff resistant. Chrome actually gives the best wear and scuff resistance; so much that on most street cars they will never even "wear in" and you'll end up w/ bad blowby. Moly kind of walks the line between the two, striking a good balance.
Author:  Doctor Dodge [ Thu Jul 20, 2006 11:54 pm ]
Post subject: 
With high compression, NOS or Turbo race engines, the moly can give you trouble, I have seen the moly "peel-off" the rings.

On street engines, the moly coated rings work well.
Be sure the cylinders are honed to match the rings you plan to use, moly rings need a smooth hone RMS.
DD
Author:  Guest [ Fri Jul 21, 2006 7:30 am ]
Post subject: 
When I ordered my engine rebuild kit I requested moly rings. The salesperson said they didn't have them in stock, but they had the cast iron rings. He asked if my cylinders were honed for moly rings, a question I have never heard. Doctor Dodge points out in this post that there is a difference. I honed my own cylinder walls with 100, then 280 grit spreading type hone. I took the cast iron rings and they seem fine on my stock 225 after 800 miles. I'll have to confirm with a compression test after my first oil and filter change.
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