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Brendan
 
Posts: 426
Join Date: Apr 2013
Car: 335i 2007 6spdman
Default 09-19-2020, 10:22 PM

Quote:
Originally Posted by greg_e
You canít add more material to the head to increase compression. CR is mainly done through the pistons. I recently built my motor with 9.5:1 CP pistons and CP rods for high boost, corrections through timing will allow you to run more boost safely and make more power

To answer your question, no you canít increase CR through the head, if anything itíll lower it more. If you want 10.2:1, get new pistons
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