Thread: Supercharger Rotor Pack Noise

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  1. #1 Supercharger Rotor Pack Noise 
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    2004 GTP with bolt on mods and 3.8 pulley 118000 miles

    So I have learned wayyyyy to much about rebuilding an M90 in the last year. Let me try to sum it up for clarity. Last summer I started getting noise from the supercharger area that would go away if i put a wrench on the tensioner pulley. Pulled the belt off and noise goes away completely.

    1- Replaced the tensioner and idler pulleys. Noise remained.
    2- Pulled snout off M90 and did the coupler. Noise remained.
    3- Replaced entire supercharger with one from a yard and installed a new coupler. Noise remained and was worse!
    4- Rebuilt the entire snout on original supercharger and reinstalled it. Noise seemed to come and go but was really bad when it was there.
    5- Noticed the stock pulley was out of round a bit so I replaced it with the other superchargers pulley. Noise remained.
    6- Replaced the second stock pulley with a ZZP modular pulley. Noise remains and the pulley has about couple thousands of an inch wobble still when spun very slowly. Noise remains as soon as the car is warm.
    7- Took another supercharger and tore it all the way down and replaced needle bearings (ebay) and I am rebuilding the snout since my out of round pulley may have damaged the last one.
    8- Reinstall the nicely coated rotor pack and if I turn the coupler by hand back and forth I hear a bit of slop. Tried a less desirable looking rotor pack and can hear the same slop.

    I'm not thrilled about removing the entire supercharger from my car (which now has no belt on it so I can drive the turd) and putting any of the now THREE M90s I own and have to some degree rebuilt because I am beginning to believe that I have three bad rotor packs with pretty good teflon coating/ suet from my egr. Two of them are completely coated black with "something" and one has small chips on the coating near the edge of the rotors.

    Help me anyone who has had any experience like this. Ive been creeping on here and ClubGP and MyMonte since and dont ever recall anyone having this kind of luck with 3 superchargers on a low mile car that has had a stock pulley.

    Ill try and post some videos of the car running noise and the slop from the bench unit.

    thank you!
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  3. #2 Re: Supercharger Rotor Pack Noise 
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  4. #3 Re: Supercharger Rotor Pack Noise 
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    First video lost its sound in the upload but itís the classic marble in a coffee can described by ZZP to be rotor related since it doesnít go away when you rev or accelerate.
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  5. #4 Re: Supercharger Rotor Pack Noise 
    Killa Bee Scottydoggs's Avatar
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    see if you can feel the rotors not moving tight to each other, they should be rather tight with no play inside.

    bearings go bad in the back of the case. good news in blowers are cheap. you can get a gen 5 for like 120 shipped from lkq.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  6. #5 Re: Supercharger Rotor Pack Noise 
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    Quote Originally Posted by Scottydoggs View Post
    see if you can feel the rotors not moving tight to each other, they should be rather tight with no play inside.

    bearings go bad in the back of the case. good news in blowers are cheap. you can get a gen 5 for like 120 shipped from lkq.
    Ive done the needle bearings in the back of the case on my latest rebuilt supercharger that was in fact from LKQ out of Idaho. I guess my question for you would be, is it worth putting it back together a third time with what seems to me (though what do I know) like a sloppy rotor pack? The rotors themselves look and seem tight as could be but the gearing on the pack is where all of them seem to have the same little play. Or should I have tried the needle bearings all along and would have fixed it right the first time?
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  7. #6 Re: Supercharger Rotor Pack Noise 
    Killa Bee Scottydoggs's Avatar
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    run it then. if you got unexplained kr change it out.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  8. #7 Re: Supercharger Rotor Pack Noise 
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    Quote Originally Posted by Scottydoggs View Post
    run it then. if you got unexplained kr change it out.
    Thanks Scotty. I appreciate what you do for this community. Cheers and I owe you a beer!
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  9. #8 Re: Supercharger Rotor Pack Noise 
    Killa Bee Scottydoggs's Avatar
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    if i only drank still. i like cookies tho lol

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  10. #9 Re: Supercharger Rotor Pack Noise 
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    Quote Originally Posted by Scottydoggs View Post
    if i only drank still. i like cookies tho lol
    dam- thats a reply ive typed before! although cookies MUST be homemade.
    08 grand prix NA3800
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  11. #10 Re: Supercharger Rotor Pack Noise 
    Donating Users bandook's Avatar
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    So the noise goes away when u take the belt off? How does your balancer look? Haven't had one go bad but I hear they get noisy.
    Top Swapped 01 Imp
    VS (very small?) cam, SD Headers, 2.8" pulley, self ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
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  12. #11 Re: Supercharger Rotor Pack Noise 
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    Iíve never removed the other belt because it goes away with removing the supercharger belt. The noise is def from the supercharger.
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