Supercharger noise??? experts chime in please
 

Well, something happened, what it is I don't exactly know. The supercharger is making a knocking noise that increases with rpms and it is silent when the pulley belt is disconnected. Anybody know what it could be before i send it off to ct-engineering?

I'm running the 3 lb pulley, and everything else seems to be fine.

If there are no leaks (around the snout), I'd check to see if the S/C oil is adequate. Maybe a lower oil level woud cause additional noise. :dunno:

Can you be a little more specific as to where the knocking noise is? Like is it coming from the gear area of the S/C unit?. Or from the shaft? etc.

:agree: where is the noise coming from? the SC itself, towards the belt side the shaft?

didn't smell any of the oil, and didn't see any leakage 9and I know how bad that stuff smells).
Sounds like the noise is coming from the shaft.

and the noise seems like it just popped up, wasn't a gradual occurrence.

is it boosting properly?

yep, it was pulling hard, and when i rolled up in front of my house, my wife asked me why my car was making that noise. I guess I didn't hear it from the exhasut and radio. But when i lowered the wiondow and listened, I heard it.

It could be a leak in your EGR valve it would make a loud popping sound thats intermitent.
For now, I doubt its something serious.
Try pressing down on the EGR valve in an effort to seal it better and see if the sound goes away.

You need to isolate the source and origin of the noise. Do you have an auto stethoscope? Since there is so much engine noise, it's difficult to hear where the noise is coming from. With the probe, you can hear if you have a bad shaft bearing or if the noise is coming from the rotor housing, etc.

http://www.harborfreight.com/cpi/cta...emnumber=41966
http://www.harborfreight.com/cpi/pho...1999/41966.gif

sounds more like a knocking or clicking noise. Either way, I made an appointmtnet with my shop, gonna try to diagnose and if needed, uninstall the unit. Then go and get a new one or have this one repaired.

Oh well, thats what I get for buying it used anyway I guess.

I am sure you might have checked...

But make sure the belt isn't slipping or is too tight at idle. Sometimes the belt needs to be re-torqued on occassion.

You can tear it down and pull the rotors out and check the condition of them and the housing, pretty easy to do, just disconnect the shaft and remove the manifolds and then your left with the gear set and rotors that gets pulled out of the housing as a whole unit after you break the seal, by hitting it a few times.

Your not running a short ram intake on your SC are you? I don't want to think that the SC rotors heated up and expanded a bit to start scrapping at the housing. Usually the clearances are paper thin.

You can also call Magnusson or Eaton and ask them :)