I bought a used 89 xr7 charger and installed it in my propane s-10 chevy 3.4. I'm not getting any boost. There is a quiet rumbling coming from inside the supercharger and the inner walls look a little scored. Dos it need to be rebuilt and is it worth it??
It's turning the right way because I can feel it blow air when I turn it by hand.
I ran it without the bypass hooked up (vacuum line and main hose) - no boost
The coupler is ok
I took the SC apart and found some scoring on the housing. I included a pic.
I also included a pic an earlier mock-up.
My crank pulley is 6" and The sc pully is 3" (stock 89 xr7 pulley) Is that turning the sc fast enough?
I bypassed the intercooler.
Re checked the hose clamps.
Tested the boost guage.
I agree with tickler, is the vacuum line on running between the bypass diapham and inlet plenum? if not it's not closing the butterfly valve and allowing the air to go directly to the intake manifold without going through the sc.
Your Throtle body isnt in loop with the IC is it? Unsure how your piping is. Seems that yes your bypass may be leaking boost and to an extent you may not be spinning blower fast enough however I'd think a 6 inch pulley should be fine.
Check out that by pass and if anything just close it off and see how you do.
I removed the bypass completely and still no boost. It's whistling extremely loud, almost sounds like a smoke detector it's so loud and high pitched! (at idle or reved)