Read a few posts in here, and changed my mind right away about putting a pulley on. Didn't want to put the thing on and blow my blower, but the thought of a simple mod like that increasing the power that I already got quite a bit, I had to check in a little more.
First I drilled SHM, since that where I bought it from last week. They said they have been selling them for a long time, and have not had one come back, or one complaint about damaged blowers with the pulley. They started explaining about the power increases, but no comment, I want to find out for myself, rather than what a dealer claims. (Yes, have a strong dislike towards dealers, always pushing their product in sly ways)
They are at present doing testing on the blower and the pulley to get more info on exactly what it does, gathering the exact RPM that it's spinning at, the temperatures it's running at above and below the blower, etc., plus they're testing the different gear ratios and the effect they'll have due to the increase in RPM.
Used the info and dug a little deeper online, through those boring reports, schematics on different blowers and turbos, mainly ones that were used for stock production. What I found was that Companies like Ford, GM, even Porsche put a very high standard of operation on their blowers. When they are manufactured, they are set very fail-safe, meaning that the blower runs usually at 40% capacity of it's operational performance. Makes sence, they have to warranty these things, make sure they're gonna last at least 100,000 miles before a problem might arise.
So lets take a blower, spinning at 13,000 RPM stock, which is maybe 1,000 RPM below what the manufacturer "states" the Max RPM is, that is it's fail-safe level. The blower actually can handle however probably RPM speeds around 16,000 to 18,000 without building a sweat, which is all that a pulley will increase approx. if that, just might only get 80,000 miles outta the blower, rather than 100,000 problem free.
Next Tues or Wed. I'll be putting the pulley onto my truck, will let ya guys know how it performs. I'll be ready to race ya guys on the track in no time.

 

Hmmmm...premature bearing wear was not the point brought out(80,000 vs 100,000). The longer rotors flexing and colliding was the focus. They won't collide for 80,000 vs 100,000, they'll collide once. You are, however, making the payments.

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Red '00 Lightning,
Adopted 4/19/00,
Power Surge Performance enhanced,
Sound effects provided by Flowmaster,
Track time pending...



[This message has been edited by 4D THNDR (edited 06-18-2000).]

 

Why do you think it can handle 16,000-18,000 if the manufacucture (eaton) only shows charts that go to 12,000 rpm's for the M112 blower?
They show a higher rpm for the smuch smaller M62 and M45 units at 14,000.

Just me .02 worth
http://www.eaton.com/supercharger



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Go Hard or Go home........
*Red 2000 SVT Lightning
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*Adopted 3/29/00
-98 Mustang GT Convertible 4.6L Supercharged with FRPP Eaton M112 @ 9psi, to many other handling/engine mods to list.....

 

I myself have had nothing but bad luck with a pulley swap.I did not see any performance increase at the track.I did however the increase in low end-torque.Then I tried to take it off...

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LAUNCH HARD

 

Didn't think you were flaming Moses, as neither am I. The increased pressure after the blades increases the flex, as would the increased heat I would guess. The 8-12 lbs of boost we see I imagine is after the intercooler so the pressure between the intercooler and the rotors would be even higher. I am no expert on 'chargers but I'm fairly certain those blade clearance tolerances are pretty tight and it would be possible for them to collide if little flexing is exerted on them. Again, this is your choice.

------------------
Red '00 Lightning,
Adopted 4/19/00,
Power Surge Performance enhanced,
Sound effects provided by Flowmaster,
Track time pending...

 

I just wanted to point something out in case some are over looking it. The roots type blower begins to lose efficency as RPM increases. At a certain point the blower will simply begin to add heat without any significant increase in air flow. So, as you overdrive the blower more you will reach a point where you will lose power. I don't know if we are at that point stock, but we must be close if people put a pulley on and only pick up bottom end power.

 

Don't know if some of the newer members got a chance to read Sal's take on snout pulleys. good reading http://members.aol.com/NLOCsvt/pulleytech.html

 

Was that not a flow issue with the blower? Due to the increase in boost, the wasn't it cause pressure increased? This isn't intented as a flamer, so don't blow this out of proportion, but if you got a properly programmed chip, good MA, and good exhaust system, would not the proper air flow solve the flex problem as the engine properly uses the advance in boost and doesn't compress the excess back into the blower? After all, it's not until the engine is under heavy stress, higher RPM, that the blower extends a higher amount of boost.
It's one of the only things I haven't found any hard info on, but theoretically speaking, would that not make sence?

 

The only problem I have had with the pulley is getting it off because the puller that ASP sends is WEAK! I do not know how Sal hurt his snout by pulling it off because but the puller would give before ruining the snout I believe. I completely bent the puller getting our pulleys off for the 3rd time and it ended up breaking. So, I made one out of 1/2 inch steel and I had no problem after that. The aftermarket pulley I believe is a tighter fit and it will take some torque getting back off but I have not damaged anything on the shaft. I believe that this pulley works great for HP increase.

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