Originally Posted by
Z28ricer
Thing is those pistons were for 11:1, yes you might be able to run a thick enough gasket to bump it down a bit, but then you run into quench area problems, and end up back where you started.
The quench thing makes me wonder how the vcr setup is going to work with that, because from what it seems, it lowers the piston at tdc to decrease the comp...
Well, that wouldn't be a problem for me then. I had my quench pads CNC'd off at Mazworx.
The other thing about those pistons that you might not know is that Wiseco had a brain fart when it came to the SR20 and couldn't get the head volume correct when it designed the pistons. Their marketing and ads say they're 11.0 but they're really as I stated earlier: 10.7:1 with a 1.1mm headgasket, which is the stock thickness on a DET motor.
The quench pad thing is less of an issue. To get a 14:1 motor (at max cr) you'll have a pretty damn small head volume. So, the difference in piston heights to min CR won't be as big as you'd think. I "shortened" a rod once by .030" and lost something like 1.5pts. If you make a piston that matches quench pads and throw it at the head for a stroke of 75-90mm, stopping 1mm shorter than usual isn't going to make a hell of a lot of difference if you're already at a low CR / on boost.