Thread: SR20 from 8:5:1 to 9:1 compression
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Old 02-02-2017, 08:51 AM   #7
mewantkouki
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Quote:
Originally Posted by TheRealSy90 View Post
150/160 with 9:1 pistons? My stock unopened s13 sr will do 180 on a compression tester on all four cylinders lol.
Your stock unopened SR has carbon build up on the tops of the pistons. That's why you're getting 180psi.
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