Originally Posted by NEIL A
So what is the lowest comp that has been openly tried on a cosworth, i know 7.2:1 is what's normaly considered as low. Lowest i have been in was a 6.8:1 and didnt feel any different to my old 7.2:1 engine.
Exactly, it is a common misnoma that compression has a huge effect on driveability
. However, the compression only needs to be as low as it has to be to allow the boost and ignition figures you would like to see. And I believe the engine you are talking about could take some more compression with no changes in the ignition / boost, which may give it a smidge more power
.