Piston rings and gaps
01-09-2009, 01:30 PM
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Piston rings and gaps
What are you guys with aftermarket pistons/rings are you gapping the rings at? I've been thinking of running stock rings with 18-21 ring gaps. What about total seal rings?
01-09-2009, 02:45 PM
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What pistons are you using?
The stock rings will only fit the aftermarket Mahle pistons, the ones that use a different piston pin diameter iirc.
If you are using Diamond off the shelf pistons use either one of the following ring sets from total seal:
CR8674-40 Classic race conventional ring kit
X8674-40 Gapless second ring kit
MX8674-40 Gapless top ring kit
I use CR8674 40 with .018 gapped top ring, .012 gapped second, .015 oil control gaps. The last two engines I built are using those rings with those gaps, one holds 32psi boost from a turbo, the other 25psi from a TVS. No popped dipstick/crankcase pressure problems or excessive knock/carbon buildup in the CC.
The stock rings will only fit the aftermarket Mahle pistons, the ones that use a different piston pin diameter iirc.
If you are using Diamond off the shelf pistons use either one of the following ring sets from total seal:
CR8674-40 Classic race conventional ring kit
X8674-40 Gapless second ring kit
MX8674-40 Gapless top ring kit
I use CR8674 40 with .018 gapped top ring, .012 gapped second, .015 oil control gaps. The last two engines I built are using those rings with those gaps, one holds 32psi boost from a turbo, the other 25psi from a TVS. No popped dipstick/crankcase pressure problems or excessive knock/carbon buildup in the CC.
Last edited by Witt; 01-09-2009 at 02:45 PM. Reason: Automerged Doublepost
01-10-2009, 10:46 AM
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01-10-2009, 03:22 PM
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The gaps I gave you are based on Total Seal recommendations for those rings as follows:
(these apply to the Classic Race and gapless 2nd rings, gapless top will require larger gaps)
top ring: (3.385)x.0055
second ring: (3.385)x.0035
oil control: .015
When you buy the rings they will come with a guide on an orange paper stating the same.
01-10-2009, 04:02 PM
#7
when i built my friends 2.2 eco i followed the total seal directions to a T. ended up going .018 top and .011 on the 2nd, and a .013 on the oil controll. put 10k km on it running 12psi, no issues. have the car apart for winter, going to do a leak down test tonight just to see what it looks like.
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