Thread: advice on supercharged ST170 engine build?
View Single Post
Old Oct 7, 2009 | 09:09 PM
  #6  
Big Will_'s Avatar
Big Will_
Borg Warner EFR Equipped!
 
Joined: Apr 2005
Posts: 5,810
Likes: 2
From: In the unit, building a 450bhp Time Attack Focus!
Default
Originally Posted by SVTyler
I'm thinking around 9. But that is the kind of thing I'm digging for answers about. Like I said, my main concern is reliability and drivability.
I would try and get it higher than that to be honest, 9.5:1 as a minimum for that sort of power.

Cam wise - i'm running around 270 degree duration with around 11mm lift. CAT Cams made my cams to my specs, however, i'm revving to 9000rpm as i've also built a short ratio gearbox...

I've also found the powerworks inlet manifold to be VERY restrictive, i found an improvement of over 30% in the flow figures by careful porting.
Reply
0