my pre gaped rings are at "0014-"0016 top ring and around "0010 bottom. so they need to be filed but to what? im at less then 6si with a 30 over bore the kb piston guide says 0.0050 ring gap factor for street n20 or supercharger but what dose that mean sorry if im not geting somthing and thanks for your guys help.

 

ok so it looks like i came up with4.30 x .0050 = 0.0215 that sound right for the top ring? what about the second ring? the same? kb says that the second rings dont need as much extra clearance... http://www.kb-silvolite.com/article....n=read&A_id=32 thanks guys.

 

4.030" x 0.005 = 0.020" (not 4.30" bore)

Second ring should be run with more clearance. Here is some reference info.

http://www.wiseco.com/PDFs/Manuals/RingEndGap.pdf

http://www.cppistons.com/LinkClick.a...j8%3D&tabid=75

At 6psi run the tighter recommendation. At ~15+ or race motor run the looser recommended. I think that would be safe.


Scott.

 

top ring gap is now at .019 thanks for your help

 

Sure thing. Good luck and have fun.

-Scott.

 

ok i talked to the kp tech guy and he says .020 top ring and .016 second ring do to the piston disign. seems tight for the second ring right i mean i think the chilton says .018 min.

 

I think thats too tight, especially for boost, even though your only running 6psi. I'd run them bigger then that, and would probably recommend planning ahead and going even bigger. Think Boosted is right also about the bigger 2nd ring gap. I probably wouldn't go any smaller then .020 top .022 2nd. Probably slightly bigger. Hopefully more will chime in here. I think i set mine up to .028/.029.

Ken R.

 

im confused i think im going to give them a call and dubble check he could have misunderstood me or somthing right now i have them at .020 top and .018 second. thanks for your guys help.

 

Old school always said run a tighter bottom to help trap anything that gets past the first. Practice and testing has shown more power and better results with a tighter top ring. I'm sure theres plenty of info if you want to search.

But yes go a little on the loose side. I am @ .035 on a 650ish hp motor.

 

Old school may not be taking in to account forced induction. With forced you don't want pressure left in the middle to cause ring bind.

Hal

 

well i talked to the kb tech guys again and they say .020 top ring and .016 second ring... so i ended up playing it a little safer and went with .022 and .018 i think i might endup runing e85 and a small shot of n20 but well see what what hapens. thanks for your help guys.