zander205 0 Posted March 20, 2008 i just did a lil work on my car changing my 1.9 pistons to 1.6 ones and had the head shaved down to its tolerance what rough idea power gains i should see?? anyone has done this? Share this post Link to post Share on other sites
taffycrook 2 Posted March 21, 2008 Done a few for rally engines but always with cams for the increase is best used with more cam. More CR on an otherwise std engine might result in little or no gains as you may find you have to retard the timing to prevent det. unless you run proper fuel. Mapped ign would be of some benifit I'm sure this would net better results IMHO. Share this post Link to post Share on other sites
DamirGTI 327 Posted March 21, 2008 I did but together with the ported head and also some other bits and bobs .. Rgs ! Damir Share this post Link to post Share on other sites
Batfink 201 Posted March 21, 2008 Done a few for rally engines but always with cams for the increase is best used with more cam.More CR on an otherwise std engine might result in little or no gains as you may find you have to retard the timing to prevent det. unless you run proper fuel. Mapped ign would be of some benifit I'm sure this would net better results IMHO. Is this because the Dynamic Compression ratio is too high with a standard cam?? Share this post Link to post Share on other sites
