Gen 2 m62 coating failure? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Forced Induction All questions and problems regarding Superchargers, Turbos, NOS, ZEX, intercoolers, water injection, etc.

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Old 03-31-2006, 07:19 PM   #11
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Where does your EGR dump its sludge? Pre or Post supercharger?
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Old 03-31-2006, 07:23 PM   #12
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Quote:
Originally Posted by llBlazin_llLo
If it is not a 'production' supercharger we can tell if they came with a coating or not (epoxy not teflon). Their was never a 'gen 2' made that was a 'production' peice. If it does (did) have epoxy coated rotors you can get them recoated for about $100 but I don't think that your rotors are coated.
Ok, so maybe my source was wrong when he said we had Gen 2 chargers, it'* quite possible. There is/was defineately a coating on the rotors. More pics of the supercharger kit, sadly none of the rotors: http://www.318ti.org/notebook/dasc/install.htm

Has anyone heard of WI induced coating failure? Another source told me it was common with the supercharged Grand Prixs running WI.
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Old 03-31-2006, 07:25 PM   #13
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Quote:
Originally Posted by llBlazin_llLo
Where does your EGR dump its sludge? Pre or Post supercharger?
I don't think I have a EGR valve. This SC is on a BMW.
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Old 03-31-2006, 07:43 PM   #14
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If you have epoxy (never teflon) coated rotors, it'* a Gen 3. Now that we have that cleared up ( ) we can move on.

What TYPE of alcohol and what percentage was it? I'd like pics of your rotors. I'm very familiar with both the Gen2 and Gen3 as well as Water/alcohol injection.
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Old 03-31-2006, 07:49 PM   #15
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Quote:
Originally Posted by willwren
If you have epoxy (never teflon) coated rotors, it'* a Gen 3. Now that we have that cleared up ( ) we can move on.

What TYPE of alcohol and what percentage was it? I'd like pics of your rotors. I'm very familiar with both the Gen2 and Gen3 as well as Water/alcohol injection.
I used a 50/50 mixture of denatured alcohol (the stuff available in the hardware stuff, near the paint supplies) and distilled water. I also ran wash fluid for a short time.

So, you mean to say the m62 never came with Teflon coated rotors?
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Old 03-31-2006, 07:59 PM   #16
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Quote:
Originally Posted by dustent
So, you mean to say the m62 never came with Teflon coated rotors?
Correct
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Old 04-01-2006, 01:01 AM   #17
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There'* your problem. Denatured alcohol was the wrong thing to do. You should have been using Methanol instead.

Not TEFLON. It'* epoxy. You CAN get teflon coating, but what'* the point? The rotors never touch each other. A low-friction coating is pointless.

The Epoxy coating is designed to tighten up the internal tolerances of the supercharger for the purpose of increasing volumetric efficiency.

Your damaged rotors will cost you between 1 and 2 PSI of boost, or about 25 horsepower until you replace them.
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Old 04-01-2006, 12:18 PM   #18
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Quote:
Originally Posted by willwren
There'* your problem. Denatured alcohol was the wrong thing to do. You should have been using Methanol instead.

Not TEFLON. It'* epoxy. You CAN get teflon coating, but what'* the point? The rotors never touch each other. A low-friction coating is pointless.

The Epoxy coating is designed to tighten up the internal tolerances of the supercharger for the purpose of increasing volumetric efficiency.

Your damaged rotors will cost you between 1 and 2 PSI of boost, or about 25 horsepower until you replace them.
Excellent, thanks for confirming. Now that I think about it, running denatured alcohol was kinda retarded, that stuff is like a mild paint stripper! Damn it!

Ok, can I replace the rotor pack myself? If so, does anyone have one that I could buy? Or where can I buy just the rotor pack?

Thanks!!
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Old 04-01-2006, 12:27 PM   #19
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I'm 90% certain that any 94/95 Gen3 M62 supercharger can swap rotors with you. This would include the intermediate plate and bearings. I'd have to see more pics of your SC to confirm.

Ebay may be your best bet at this point, or contact www.canadiansupercharger.com and ask if they have one laying around. They may have had a scrapped case that needs a home for the rotor assembly.

Keep in mind that after running denatured alcohol, your lower intake seals may be compromised, and you should also replace the needle bearings in your case, as the alcohol may have degraded the grease.

http://www.williamwren.com/superchargers
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Old 04-01-2006, 01:10 PM   #20
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Quote:
Originally Posted by willwren
Keep in mind that after running denatured alcohol, your lower intake seals may be compromised, and you should also replace the needle bearings in your case, as the alcohol may have degraded the grease.

http://www.williamwren.com/superchargers
Wow - You have a great site put together! I'm one of probably less than 100 people in the world running this m62 on a BMW, so the BMW guys don't know anything about my problems. Thanks to everyone for helping me figure this out.

If I can source a rotor pack from another m62, I'd like to try swapping it out myself. From the research I've done, it seems semi-straight forward....is this right?
1. seperate the nose drive from the rotors/housings.
2. slide the rotor pack out of the housing
3. repack the needle bearing with special lube
4. insert new rotor pack
5. install nose drive, bolt everything back together.

Am I missing anything here? Do I need any special tools to disassemble and reassemble the SC far enough to replace the rotor pack? I understand that I need the rotors pre-installed into the intermediate plate (I don't know what this plate is, but it sounds like it'* a mess to press the rotors into it, correct). HighSpeedLabs sells the rotors installed on the plate, I'll see what they can do for me.

Thanks again.
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