I am ready to start filing rings for my build. d16a6 block and head, 75.5mm SRP 4.3cc dome pistons, 12:1 final compression, 0.0025 piston to wall. I searched and everyone has differing opinions. I was shooting for:
Top: 0.015"
second: 0.016"
oil: around 0.015"
I am using JE XC chrome rings
any input would be great, thankx.

 

You can run .013-.014 on an NA app for the top ring. Second on oil rings look about right.

 

Why so wide? Turbo or nitrous?

 

No reason--I wanted to be conservative--like if the car overheats, I don't want problems--not saying I really "know" well--I already started doing 0.015" on top and 0.016" on the bottom. Not too bad, right?

 

delicious carburetors.....

 

Also, I don't want to rule out running 70-80 shot direct port--I think that is as low as you can go direct port, right? So I figured a little extra wouldn't hurt.

 

I am a bit confused on the "spring" part of the oil ring, when I put it in the bore by itself the ends butt up against each other--it looks like the ends are hitting and sort of compressing the rest of the ring--the actual two metal rings are fine--but should the "spring" part ever have to be trimmed, and would I cut it or just sort of file it? Don--Combustion?

 

The middle part of the oil ring set is designed to be under tension.Be sure when you assemble them on the piston that the ends don't overlap.

 

thank you, njin buildr--I was getting worried for a little bit, good thing I didn't file the oil rings...