Zmanco Posted April 20, 2006 Share Posted April 20, 2006 I've had a heck of a time finding rings here in CO for my flat top pistons in my N42 block. After returning the wrong rings twice (both times with L24 rings in an L28 box) we've found a new source who has Perfect Circle chrome rings. But they only stock the turbo set, not the N/A ones. They (the warehouse) says that the only difference is that the turbo set has a chrome second ring where the N/A is cast iron. They say that there's no issue with this, and that seems to make sense to me. But before I put them in I wanted to check here to make sure I'm not missing something. I'm only planning on this rebuild once BTW, the shop honed the cylinders for chrome rings. Quote Link to comment Share on other sites More sharing options...
DemonZ Posted April 20, 2006 Share Posted April 20, 2006 I believe the turbo top ring is thinner than the NA. Quote Link to comment Share on other sites More sharing options...
Zmanco Posted April 21, 2006 Author Share Posted April 21, 2006 I believe that's true for the NA 75-80 where the top ring is 2 mm. But the flat top pistons in the 81-83 NA are 1.5 mm which I believe is the same as the turbo. Any of you turbo guys out there able to confirm that? Quote Link to comment Share on other sites More sharing options...
AK-Z Posted April 21, 2006 Share Posted April 21, 2006 In my haynes 280zx book, it shows that the top two rings are different. The NA rings, the outer edge are angled and the turbo are squared somewhat with rounded edges. Quote Link to comment Share on other sites More sharing options...
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