hello guys.

i am planning to install some -7cc mahle gold pistons on this ATR 2001 CH1 212hp ( 11.0 oem compression).
Using this pistons in h22/h22a/h22a4 will lower it to 9.0 but i am not sure on my engine what would be the final compression.
I am not sure about the PDE head volume but i calculated something like ~9.5 comp would make in this h22a7 engine.Nothing sure although...



i emailed RSP and they don't know about this engine and its specs...