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Old 02-20-2004, 09:25 AM
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ring and piston installation

I've searched through old posts and I haven't seen the question I have specifically addressed.

I'm putting new cast iron rings into a chevy sb. I have always read and heard that I should oil the rings and cylinder walls when installing the pistons. Recently, a machinist told me that this was "old school" and that it was better to install dry pistons into unoiled cylinders. He said that this would seat the rings "almost immediately". I am somewhat apprehensive to do this, as it is so different from everything I've ever heard. I was wondering if any of you had any thoughts on the matter.


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Old 02-20-2004, 09:37 AM
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I always did no oil installs with chrome moly rings since they are poop-heads for not seating well. I dont think your gonna have to worry about seating with cast rings.
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Old 02-20-2004, 11:00 AM
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Make sure you oil the wrist pins, I put some light oil on the piston skirts. For the bores, after I've cleaned them well I wipe them down with a light film of 40w. I also don't oil the rings. I've never had a ring welding issue and get great leakdown numbers. I close friend who ran NHRA pro stock back in the 80's uses tranny fluid instead of 40w but I haven't tried that yet.
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Old 02-20-2004, 11:33 AM
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Some thoughts:

A) The only reason to use cast rings is if the engine runs on propane or natural gas. For almost any other reason, moly rings are by far the best choice and are just a little more expensive.

B) If there are problems seating moly rings, the fault lies not with the rings but with bore finish, fuel mixture, etc.

C) A small amount of oil is necessary to insure initial lubrication of the rings on start-up. What kind of lubrication is more of a personal choice, but engine oil or the lubes specific for this use are recommended. While there's no need to dunk the piston in a can of oil, a few squirts of oil from a CLEAN oil can on the skirts, bores, and rings will work just fine.
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Old 02-20-2004, 12:04 PM
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Thanks all for the good advice.
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