.020 over size p&c

[slakjaw]

hi

I am looking for new p&c for a 2.2 motor I found a set that is .020 oversize but I am kind of scared of them. I have heard horror stories from pplz that used any piston ring other than the factory ones. has anyone here ever heard of someone boring the barrels for bigger pistons. can I use factory rings whith them?
i am guessing i will need oversize rings. if anyone here has any expirence with this please let me know how it all worked out for you



Thanks
Kyle

71 911 T

[slakjaw]

anyone have any expirence with TRW rings

do thay get too hot and melt?

[Wayne 962]

I don't completely understand the question?

Oversized with respect to what? Ring groove?

-Wayne

[slakjaw]

what i was told was the cylinders were bored .020 over, and .020 JE oversize pistons were used. To me that means that you would have to use oversize piston rings as well. to accomadate the lager bore size maby i am wrong i dont know

thanks for the responce wayne
i hope this explains it better


Thanks
Kyle

71 911

[jluetjen]

.020 is usually considered 1 size over and most OEM manufacturers will carry rings for it. That being said, my experience in this regard is with non-911's in SCCA's IT classes where everyone is allowed .040 and most will run at least .020 because it's original from OEM.

If Pelican doesn't have them, I'd call Andial and see if they carry them. You might also want to call your local Porsche dealer and see if they carry the rings. You might be pleasantly surprised.

[Bobboloo]

One more thing. Since yours is a T motor you don't have to worry about boring the cylinders since they are made of iron. The nickasil cylinders on the other hand have to be recoated.

Bobby