Re: cast or chrome molly rings
There's been confusion about ring material for decades, now. I'm also not up to speed these days, but here's the lowdown as I understood it:
Cast iron, uncoated rings are typical stock replacements.
Cast iron, chrome face plated rings are/were used for more durability in severe applications, like circle track engines...the chrome face is harder, but was also more difficult to seat (break in).
Cast iron, molybdenum face coated rings are the more modern choice, able to handle high heat and aren't too difficult to seat.
Unless something new has happened, there is no such thing as a "chrome moly" piston ring. They are all cast iron with or without various platings/coatings.
Can anyone else help?
Fuel & Brake Systems Engineer
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