[AMC-list] Piston Ring primer

["Bruce Hevner" <scramblr@xxxxxxxxxxx>]

> I assume you mean "moly rings", right? Chrome rings are very old 

> school race only parts that were meant to reduce friction. Due to how 

> hard they are, they end up not sealing well and you end up with a 

> motor that uses a lot of oil.

> 

> 

I mis-spoke, I think they're "Chome moly" rings but you're right I'll
double-check. I only know what I read, I don't build engines often enough to
know/retain squat. I am checking on all parts, NOS vs. new manufacture

 

Actually there is no such thing as a "Chrome Moly" ring. I don't know where
this got started but the term has been around as long as I can remember.
"ChromeMoly" is a type of steel.

In piston rings you are referring to the coating for the top ring. This can
be either "Chrome" or "Moly". There is SO much information on rings on the
net already I won't try and duplicate it here. This is a good place to
start,,

http://www.stockcarracing.com/techarticles/scrp_0510_piston_rings_basics/ind
ex.html

Chrome faced rings are not meant to reduce friction but to resist wear as
Chrome is very hard. It's still used in dirt track engines or anyplace wear
resistance is the top factor. There have been so any advances made in the
Moly coatings it now rivals Chrome in many respects and surpass it in most
others. MOST rings you see now days will be Moly. Rings have become SO thin
that in many instances a solid steel (hardened) ring is all that will
survive.

I have had EXCELLENT results using TotalSeal rings in my race engines. As a
company they have been MOST helpful in answering questions and being able to
supply hard to find rings. 

But HEY,,, that's just ME!

Bruce Hevner

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