I had a high helix roots type on a injected V6, lots of low to mid range grunt. It developed about 5 PSI of boost at max RPM.
Ran a Weiand 6-71 on a carbed small block. High boost with O-ring heads. The chassis was a shortbox truck. Heat soak was a problem on both, the second worse than the first. In order to keep the performance from really dropping off in between races I had to use bags of ice to keep the blower housing cool. High rpm and heat go hand in hand with roots type blowers.
I have not had this problem with my procharger. The horsepower stays fairly consistent. Heat comes from three sources on a roots type blower like a maggie.
1.Motor heat conducting from the bolted interface with the motor.
2.Heat generated from air molecules being sheared during operation,
3.Friction in the system, mostly due to what type of blade the blower vein has.
I believe the procharger systems get alot less of 1 and 3. Plus you get the added bonus of alot less mass, which provides quicker cooldowns. I.E. your power adder is not tied to a giant heater, the engine.
Here again, I am just throwing out my past experiance with both, and opinion.
The above does not make my car better or worse than anybody elses, just different.
I am not taking sides here, but trying to foster a technical chat.
Last edited by RamAir69; 06-16-2005 at 06:23 PM.