High pitched squeak
Thread Starter
Le Mans Master
Joined: Aug 2004
Posts: 9,770
Likes: 0
From: Sahuarita AZ
High pitched squeak
Hello all:
I have a Magnuson supercharger installed in my 99, and lately, I've been hearing a high pitched squeak, or a whistle, when I accelerate. No, it's not the whine of the supercharger. This is different. It's tough to explain, but I can only hear the squeak/whistle upon acceleration...if I'm coasting or just maintaining speed, I don't hear it.
Any clue?
I have a Magnuson supercharger installed in my 99, and lately, I've been hearing a high pitched squeak, or a whistle, when I accelerate. No, it's not the whine of the supercharger. This is different. It's tough to explain, but I can only hear the squeak/whistle upon acceleration...if I'm coasting or just maintaining speed, I don't hear it.
Any clue?
Thread Starter
Le Mans Master
Joined: Aug 2004
Posts: 9,770
Likes: 0
From: Sahuarita AZ
The Magnuson supercharger actually comes with its own air intake. So with you, that squeak actually occurred with two separate intakes? That's interesting.
Former Vendor
Joined: Dec 2006
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From: The AutoBuffs Army is unmatched in the Custom world! www.autobuffs.net
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St. Jude Donor '08-'09-'10
Cruise-In IX Veteran
Look at the idler pulley or tensioner ...could also be a belt
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 78
From: Forney Texas
I too have the Maggie, but don't have the squeak. I know that this blower puts hellacious loads on the pulleys. Mine was puking belts every day until I called Magnuson and they told me about an update that keeps the tensioner from deflecting away from the block and throwing the belt off. That worked fine until I ripped the idler pulley off along with the entire corner of the aluminum bracket that it's bolted to. I tig welded the crap out of that and have been fine for 1kmi so far. With all of the load the blower places on the pulleys, I would try to carefully spray some good penetrating lube on the pulleys ( 1 at a time ) to possibly isolate the problem. Spray the idler and go for a drive. If it goes away, there you go. If not, continue to the idler on the maggie, then the tensioner. You may also remove the belt and check for any play in the pulleys. Let us all know what you find.
Team Owner
Joined: May 2006
Posts: 21,473
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From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Sounds as if one of the pully's or idler pulley's are in need of a replacement!
Possible to be the A/C idler pulley as is mine or it is also possible for it to be the alternator which will do this under acceleration.
You'll need to get someone to help you identify it!
Thanks,Matt
Possible to be the A/C idler pulley as is mine or it is also possible for it to be the alternator which will do this under acceleration.
You'll need to get someone to help you identify it!
Thanks,Matt
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Thread Starter
Le Mans Master
Joined: Aug 2004
Posts: 9,770
Likes: 0
From: Sahuarita AZ
Thread Starter
Le Mans Master
Joined: Aug 2004
Posts: 9,770
Likes: 0
From: Sahuarita AZ
Okay, I have an update on this. Coming home from work yesterday, I decided to make sure that the supercharger was still making the boost that it's supposed to. It should be at about 6 and 1/2 lbs. However, even when floor the accelerator, it's only making between 3 and 4 lbs. That means I've lost half of the boost that the charger is supposed to produce. Does that change this scenario at all?
Melting Slicks
Joined: Aug 2006
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From: Tampa Bay, Go BUCS!!!Go Rays!!!Go Lightning!!!
St. Jude Donor '12-'13-'14
I don't know much about Maggies but
1) do you have a blowoff valve? could it be leaking (and whistling)?
2) is it possible your rear drive belt is slipping?
1) do you have a blowoff valve? could it be leaking (and whistling)?
2) is it possible your rear drive belt is slipping?
Thread Starter
Le Mans Master
Joined: Aug 2004
Posts: 9,770
Likes: 0
From: Sahuarita AZ
Where would the blow off valve be?
Thread Starter
Le Mans Master
Joined: Aug 2004
Posts: 9,770
Likes: 0
From: Sahuarita AZ
Actually, according to this Wiki article, the Magnuson would not have a blow off valve, as it is roots and not a centi-type supercharger:
http://en.wikipedia.org/wiki/Blowoff_valve
http://en.wikipedia.org/wiki/Blowoff_valve