Originally Posted by
Sweet2002
Of course the SC rollers spin up to 3 times that of the number we get doing the math.
This is when I looked at Jefasolds 70mm sC pulley. Jim had that nailed a little past the 15,000rpm number but not crazy like doing a 178/65 combo which yields 16,978RPM at our motors 6200rpm redline. Trying to do that combo creates a lot of work with questionable gains.
I think I mentioned before - the SC has an internal gearing which spins the right hand side 5 lobe rotor to 5/3=1.666 times the pulley rpm. The left hand 3 lobe rotor spins at the pulley speed.
I've
toyed with the idea of putting the larger capacity (longer) SL55 SC on there to negate some efficiency/heat/AIT issues. A guys done it on the 3.7L M112 motor.....maybe one day - it would probably be coupled with integrated 2ndry cooling tanks/manifolds and maybe the Killer chiller - well that's the current thinking/dreaming. At the end of the day it all takes time and money.....alternatively E85 would be a game changer - others opt for N2O