Cast VS Moly?

[turbovanman²]

Ok, we all know to use Moly rings in a turbo-resists the heat and pressure much better, BUT what would happen if cast were used?

[wallace]

The cast is harder on the cylinder walls. I believe my Wiseco's came with a moly top and a cast 2nd.

[turbovanman²]

The cast is harder on the cylinder walls. I believe my Wiseco's came with a moly top and a cast 2nd.

Actually, cast is softer.

[wallace]

I was under the impression that a cast ring caused the cylinder to wear. I tried to find some info on the internet that pertained to ring materials and their characteristics but didn't find anything that really applied to your question. What I found was that the majority of the compression rings are ductile iron with some sort of coating on the face to enhance the performance. While I was searching I did come across some neat links from Federal Mogul for various engine parts. Here is a few of them:
http://www.federal-mogul.com/fmeconnect/technicalservices/downloads/1205.pdf
http://www.federal-mogul.com/fmeconnect/technicalservices/downloads/1206.pdf

[Frank]

Actually, cast is softer.

He didnt say it was harder then moly. He said it was harder on the cylinder walls... aka causes more wear. This has to do with cast being less consistant in metal expansion, shape, and such.


Frank

[turbovanman²]

He didnt say it was harder then moly. He said it was harder on the cylinder walls... aka causes more wear. This has to do with cast being less consistant in metal expansion, shape, and such.


Frank

Yes, I know but I have been told that Cast cause less wear but they could be wrong.

I will do some reading on those links. :thumb:

[injmopar]

Cast is your basic inexpensive ring.
Moly rings are cast rings that are induction hardened and moly coated face.
Moly rings are more ductile so they can take more detination.

[GLHS60]

If you have ever taken apart a high mileage original engine and found no ridge and could still see the crosshatch pattern this is mainly due to the Moly rings. They are very easy on cylinder walls, and have a long life expectancy. Running cast rings in a good cylinder will cause the cylinder to wear much faster than Moly. If you have to run a block that had a ridge or any scoring etc. cast would be best as they will wear through the scoring etc. but their life expectancy is much shorter.
Thanks

[wallace]

Here's what Hastings has to say about the three types of rings....pretty much what federal mogul said.
http://www.hastingsmfg.com/Service%20Tips/ring_set_composition_recommendat.htm

Assembling my short block starting tonight. :o