I've never had this issue before... SRP pistons, JE pro seal rings. Pistons are 149179's which are supposed to be 2.963". I specified that I wanted .0035 PTW clearance. Machine shop measured pistons at 2.9614 and bored the block to 2.9649 to get the desired clearance. All seems fine... until I go to check ring gaps...

Spec sheet calls for "min" gap of 2.9614 x .0050 = .0148 on the top ring. Without filing the ring or anything, I have .022 right now as it sits. Untouched.

So what should I do here? I have the correct rings, according to the part numbers. The machine shops math seems good. I've NEVER had a set of these pro seal rings be off this much before. This would be the third set I have used in my builds. The clearance right now is right at the "Service limit" in the helms. Granted this isn't a stock engine, I don't want it to be down on power and possibly consuming oil because ring gaps aren't correct.

 

That service limit is based on the gap opening up because of bore wear, not becuase of the ring gap itself being too big.

I might get flamed for this but imo big ring gaps are not big deal proved the aren't a result of the bore/p2w being out of spec.

Combustion occurs in milliseconds and due to the "labyrinth" nature of rings and the fact that the gases are limited be the speed of sound, you can actually have quite large ring gaps and be fine.

I'd rather have way big gaps than even slightly too small especially with forced induction.

 

i had that same problem bro!

i ran my engine, minimal blowby
but i went for 4thou clerance

i think you would be fine


make sure your fuel is dialed in good before you go up
and clock your rings properly

 

How much boost/power are you going to run? .022 should be fine. Im running 25psi/500whp and my gaps are .0026 and .0022