I have a roots blower too. So did John. We both ran before and that's where you have to or else you inject streams of water. Running before the blower allows it to vaporize with the blower heat and it seals the rotors better anyhow. I am running 15 psi with meth injection with 93 octane fuel (US grade, approx 98 in europe?).
I have the stock head gasket.
As long as you don't run anything other than water or methanol your blower will be fine. I just opened mine up this week and it was pristine. It has over 10k from when I put meth injection in and the blower has been on the car for almost 90k now. I'll probably have it rebuilt just to have the lube replaced and plastic pieces redone and the coating reapplied within a couple of years.
I also have NickG's tune. |