Moly filled vs plain ductile iron top piston ring
Moly filled vs plain ductile iron top piston ring
(OP)
I've done some searching, and nothing I found specifically addresses my question. I am rebuilding a factory turbocharged engine that originally came with a chrome faced top piston ring. These rings are no longer available, so my choices are a typical moly-filled top ring, or a traditional non-filled iron top ring. What are the pro's and con's of each, considering that I intend to make use of a great deal of the engine's inherent power capability?





RE: Moly filled vs plain ductile iron top piston ring
Rule of thumb: If the engine makes more than one horsepower per cubic inch, (60 hp/liter), then a nodular (ductile) iron or steel is the best choice as a base ring material - for strength.
The plain iron ring is strictly a low cost option.
RE: Moly filled vs plain ductile iron top piston ring
RE: Moly filled vs plain ductile iron top piston ring
Get a moly-filled, ductile iron ring.
The ductile iron is stronger and will stand up to pressure better than grey cast iron. The moly is wear resistant and scuff resistant.
RE: Moly filled vs plain ductile iron top piston ring
RE: Moly filled vs plain ductile iron top piston ring
Plasma moly has a stronger bond, but it is still weaker than chrome's bond.
RE: Moly filled vs plain ductile iron top piston ring