top ring gap tolerance??

[Ortie666]

So im building a 3.1L engine and the pistons im putting in say that the ring gap should be 40% more than stock. The site says that the ring gap should be within (inches) .006 and .015, and 40% on to those sizes is .008 and .021 so should I pick .008 or .021. being that .008 is pretty much the stock size it confuses me

[SappySE107]

RE: top ring gap tolerance??

I think it depends on what you are doing with the motor. Higher output/heat could need more gap. im surprised the rings dont tell you the exact gap to use under different running conditions like turbo/sc/nitrous and power output.

[Ortie666]

ok, ill look that up.. but ya.. they saay juss to take the stock recomended size and add 40%, there keith black pistons

[v6h.o.]

there keith black pistons

Does KB make off the shelf 60v6 pistons? or was this a custom ordered set?

Agree'd with Ben on the gap.

[614streets]

Top Ring gaps Gap per inch of bore diameter
.004 - street performance
.0045 - drag/oval track
Nitrous(street) .006
Nitrous (race) .008
Supercharged .006

Second ring Gap per inch of bore diameter
.003 - street performance
.0035 - drag/oval track
Nitrous(street) .005
Nitrous (race) .0065
Supercharged .005

Febuary 2000 car craft




On a side not gapping the second ring slighty larger than the top ring is the current trend as this allows the inter ring pressure to escape during the up stroke and keep the top ring fully seated , helping overall sealing which means more power.