I've been running the PowerWorks kit on my ST170 for a while with great success. I'm now needing to rebuild the engine. My goal is 250-300 whp with bulletproof reliability. I'll be fitting an overdrive crank pulley for more boost. I'll probably use a basic pistons/rods set up. I'm also interested in upgrading my valvetrain with cams and valve springs etc. Can anyone suggest cams to go with a supercharger? Should I keep the VVT? Any advice would be greatly appreciated!

 

https://passionford.com/forum/restor...e-for-now.html

 

As above, Tiny Will's your man

 

What sort of compression ratio are you looking to run?

 

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.