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Posted: **Sun Jan 18, 2009 8:16 pm**

What is my compression ratio with .020 overbore Wiseco pistons in a Ej22 block with EJ20G heads?
The heads came off a 1989 JDM Legacy. I'm pretty sure they are the ones with the 57 CC combustion chambers.

This chart:
http://www.nolimitmotorsport.com/wiseco ... ubaru.html

Says the piston dish is -20CC and I also saw that on the box when I installed them. It says that I get 8.5:1 compression with a 46 CC head. If you add 10 CC to that what does the compression ratio come to?

Posted: **Sun Jan 18, 2009 8:17 pm**

About 7.66:1. This has been covered in other topics before.

Posted: **Sun Jan 18, 2009 8:26 pm**

Wow that has to be the most straight forward response ever. Have a cookie!

Posted: **Mon Jan 19, 2009 7:03 am**

wtf???

Posted: **Wed Jan 21, 2009 4:12 am**

please be carefull!! i gave one to a friend and i guess that was all he ate and he almost did the chicken

Posted: **Thu Jan 22, 2009 12:16 am**

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Ej22 /w Ej20G heads and Wiseco pistons - compression ratio?

Ej22 /w Ej20G heads and Wiseco pistons - compression ratio?