i need some help in filing my piston ring gap. it's 84.5 CP 9:1 Compression
bore size is 3.327. what is a good ring filer/grinder? what do I file the top ring to and what is the second ring? I have been told .017 for top and .017 for the second ring. That sounds kinda fishy. any info would help. Thank you!

 

Have you called CP and asked them yet?

 

Okay I called CP this morning and the tech didn't know what spec to file them at. It was with hesitation then he said for the top ring. .020-.022 the middle or second ring. .024-.026 that seems like a large gap. Anyone has ever filed this ring. please help me out. Another person said top is .018 and middle is .022. other said. .017 for top and middle. please shed some light!

 

depends on the type silicone your piston is for one, high compression, turbo, each requires a correct gap due to metal expansion etc.,.....

 

i know of the silicon content. i just need some one who has cp piston shed some light here. It's for turbo, of course. 9:1 compression, 84.5mm inverted dome style. I need ring gap numbers. some one with fact. I could appreciate some real life experience. Thanks again. slow

 

I do 18 on top 20 on middle on race motors, 17 and 19 on street.

 

Thanks, I knew some one with experience would come through. I was dissappointed you didn't get to run your car at CMI. All that driving from socal. Goodluck I hope you break the 9's this year.

 

Thanks. I'm making a lot of changes to make it ET better. The mph was definitely there @156 buteverything wasn'y jiving toghether. It'll be back for Fontana.