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Old 12-27-2002, 08:49 AM
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Post piston rings please help

I am redoing a motor and im buying rings for a new set of pistons. i called one place and they asked if i wanted file fitted rings or do i want the regular moley rings that are not filed. Do you have to file down the rings? can the pistons be installed without filing the top ring down. its a 350 40 over hyperurtentic piston size of rings 1/16 1/16 3/16.
If you could help id appreceiate it

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Old 12-27-2002, 08:56 AM
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cant help you much cause all i know are that with those type of pistons the gap is HUGE, not just 5 thousants, you need rings made for them. file the ends to get gap bigger only if nec. it's been posted before what the ring gaps should be so if you can check the past posts, although in the month since i've seen it there must have been 500 posts so good luck finding it. but! you can follow the mfgrs instructions for the pistons if you have them, i think the gap was in the neighborhood of 30 thous, but I'M NOT SURE! MAKE SURE YOU CHECK THE RING GAP IN THE CYLINDER BORE. oil, then stick in with top of piston, use feeler gauge.
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Old 12-27-2002, 01:44 PM
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The file fit rings are made so you can insure your own ring end gap. I think it's very important that you always check your ring end regardless of the type of rings you have.
If you do opt for file fit rings, you'll need to square each ring into the cylinder it will be used in, {use one of your pistons if they are a flat-top} check your ring end gap, if it's less than .016" on the top ring, you'll need to open the gap up some, and probably around .018" on the second ring.
Usually, if you are file-fitting rings, it's best to use a precision ring grinder, which you can buy fairly cheap, or you can do it the old-fashioned way and use a small, flat file.Try to keep the ends square and parallel to each other.
Remember that different engine applications will require different ring end gaps, so follow your piston manufacturer's guidelines. Hypereutectic pistons generally require quite a bit more end gap, due to increased heat retention. Also, supercharged, or nitrous applications will require a more end gap, so if you are going to file-fit, do your homework, and make sure you de-bur the ends of your rings with sandpaper to prevent scoring of the cylinder. WHEW!!!!!!!!!!! or,
JUST BUY PRE-GAPPED RINGS, AND DOUBLE CHECK THEM.

[ December 27, 2002: Message edited by: NAIRB ]</p>
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Old 12-27-2002, 02:56 PM
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Old 01-03-2003, 09:45 AM
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Thumbs up

Thanks for all the info.
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Old 02-08-2009, 06:32 PM
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ring end gap

Ring end gap is ,004 for every inch of cylinder bore. 4in bore = .016 gap
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Old 02-08-2009, 08:15 PM
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Got to know which brand of hypereutectic pistons you have to make this decision--Keith Black's at .004" per inch of bore size = BIG DISASTER. What brand do you have??
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