This is topic Supercharger Question in forum Tech Talk at Northern California Ford Owners  .


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Posted by Stang347 (Member # 1191) on :
 
i have a 90 gt.my s/c at idle(600rpm) will make thi kinda grinding noise..i dont no how to explain it...but once i rev it to about 750 rpm it goes away..it only happens at idle...ive pulled the belt and spun the pulley by hand..spins good..no rubbing from the impeller..should i just raise my idle?!?!
 
Posted by Black94 5.0 (Member # 655) on :
 
What kinda blower is it?.. self contained oil system(Kenne Bell/Powerdyne)or does it have an oil line like the (Vortec's)..maybe its low on oil?
 
Posted by STROKD (Member # 1668) on :
 
quote:
Originally posted by Stang347:
i have a 90 gt.my s/c at idle(600rpm) will make thi kinda grinding noise..i dont no how to explain it...but once i rev it to about 750 rpm it goes away..it only happens at idle...ive pulled the belt and spun the pulley by hand..spins good..no rubbing from the impeller..should i just raise my idle?!?!
Raise the idle, and tighten the hell out of the belt. My car did that till I tightened up the belt, what was causing the grinding was the tensioner rattling from the belt shaking...
 
Posted by Stang347 (Member # 1191) on :
 
ill check the tensioner but it sounds like its comming from the s/c but i dont no y it does it at 600rpm but not at 700 and up...its weird..the belt is pretty tight ill try and tighten it maybe
 
Posted by LAST302 (Member # 808) on :
 
I would raise the idle if I were you. I got mine idling at 1000rpms and the computer tuners as well as reputable shops say it is fine. How long are you ever idling anyway? Personally I bet there isnt nothing wrong with the blower, its just getting ready to dye from such a low idle. Just my opinion from working on my own car.
 
Posted by Stang347 (Member # 1191) on :
 
ok i will raise the idle but my cam sounds really good at 600..ill raise it to about 800 rpm...just change it with the idle screw correct!!?
 
Posted by LAST302 (Member # 808) on :
 
We all like our cam to shake the car like a mf but it will be better at a higher rpm. My opinion.
 




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