Chrome vs Molly Rings.. Which are Better and Why? - Chevelle Tech
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post #1 of 7 (permalink) Old Nov 20th, 04, 9:23 AM Thread Starter
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Between using Chrome and Molly Piston rings in a 350 small block 4-bolt main bored out.040 with Fuelly Cast Iron Heads, which would make the better ring and why? Please Note that motor is in a street machine that will see very little if any time at the track!

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post #2 of 7 (permalink) Old Nov 20th, 04, 10:20 AM
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Chrome rings are alot of money and are used mostly in industrial engines that are in dirty conditions and there will wear a cylinders faster as chrome rings are so hard there seems to be more wear with them and require a corse finish.

Moly rings are less money and the moly finish on the rings help lubricate the cylinders and you can use a fine finish sush as a 280 grit.
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post #3 of 7 (permalink) Old Nov 20th, 04, 11:55 AM
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Some dirt track racers like chrome.

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post #4 of 7 (permalink) Old Nov 20th, 04, 7:35 PM
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Chrome tolerates dust bettter. Note that the cylinder walls aren't chrome, so they still wear plenty fast when exposed to dust.

Moly is what you want unless you plan to leave the air filter in the garage when you drive the car.

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post #5 of 7 (permalink) Old Nov 20th, 04, 8:06 PM
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If not mistaken, chrome rings require "round" cylinders b/c if the cylinders aren't round, they take forever to seat b/c the chrome is so hard that it takes a long time to wear the chrome coating down so the rings fit and seal properly.

I don't think it is a good idea to use chrome rings for a "dingle-berry" hone, "shade-tree" overhaul b/c the cylinders are usually worn unevenly so aren't really round to allow chrome rings to seat quickly unless you bore her oversize and change pistons.. Then the cylinders will be round again...

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post #6 of 7 (permalink) Old Nov 21st, 04, 3:46 AM Thread Starter
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Oh Boy.... Well guys, the engine is already finished "with Chrome rings installed". [img]redface.gif[/img]

Oh well, Come next summer I'll run her around a little bit to see how she holds up. If the Chrome rings prove to be a no-go, back to the machine shop she goes

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post #7 of 7 (permalink) Old Nov 21st, 04, 5:54 PM
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Moly or cast iron. Chrome is rarely used in a street engine. Be aware that the cylinder requires a different finish for Moly and cast iron rings. The hone stones used for moly rings are finer grit.

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