To recap, a couple of months back we built a PP 13B with Renesis rotors for a Gen 1 S1 race car. Motor was specced & ported the same as the old one, with the rotors being the only real internal difference

All were interested in what difference the hi-comp rotors would make.

Well this motor has done 3 meets now with no issues other than a leaking oil cooler line. Car has dynoed (on the same dyno) at 24 hp more @ 8500 than the old engine when it was fresh. Mid-range torque is better, & driver reports much better punch out of corners.

So yes, using Renesis rotors gives an improvement. Not enough IMHO to pull apart a good motor to fit them (unless every last bit counts & the cost doesn't) The renesis rotors are the same price as the older types here, so 24rwhp for the cost of milling ther seal grooves makes it a must have at rebuild time for an NA!

Maybe even a turbo..........

 

cool, the renisis rotors are cheap here, almost half the cost of the 9.7 rotors

 

Are they really that cheap? What can you get a set for? What is the compression?

 

CR is 10.0 and they cost $305 USD each.

 

what needs to be machined?

 

hmmm... high compression and turbocharge means....... faster spool up and better low end...... right?

 

theres a downside do high compression turbocharged cars too. like blowing **** up

 

lol...that's the cost of horsepower too

 

It always gives you a good story to tell your friends.

 

ok i have a question, when using lower compression rotors for a high hp application, it is easy to use healthy amounts of boost to up your power. now with the higher compression rotors you can still boost the engine but it will be at a limit and tuning must be very precise correct? now what i want to know is which method is better in the sense of flat out making high power? low comp/high boost or high comp/low boost?