Reversing a Standard Rotation Supercharger - TCCoA Forums
 
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post #1 of 5 (permalink) Old 12-01-2003, 11:08 AM Thread Starter
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Reversing a Standard Rotation Supercharger

To all the supercharger guru’s out there…

I have an older model Paxton supercharger (SN-60) lying around that needs a home. It’s a standard rotation centrifugal that I need to mount backwards on an engine.

Here’s my idea: Mount a toothed gear (similar to a timing belt gear) onto the water pump pulley (which turns opposite the normal engine rotation) and connect the blower’s toothed gear via a belt drive. I think someone here is running a toothed drive on a roots blower, so it would be similar to that.

My questions:
1. Will the front bearing on the water pump handle the extra side loads?
2. Will the main accessory drive belt provide enough “grip” on the water pump pulley to turn the blower. It will have about 1” x 7” of contact, but on the smooth side of the belt, not the ribbed side of the belt. (Personally I don't think it will)
3. If not, would “knurling” the water pump pulley enhance or hinder the grip? (Or just eat the belt faster as it slips )

Any thoughts on how to mount this SN-60 on say a 4.6L DOHC?

Right now, I’m thinking low on the passenger side since with the battery and coolant reservoir gone, there’s a fair amount of room there. And the only thing on the engine proper is the left coil pack and the power steering pump reservoir.

Thoughts, suggestions, comments….

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post #2 of 5 (permalink) Old 12-01-2003, 11:32 AM
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I would think your best bet would be to turn the supercharger itself around backwards to accomodate the rotation.....kind of like the alt on an AED kit

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post #3 of 5 (permalink) Old 12-01-2003, 12:45 PM Thread Starter
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That's the problem.

To turn correctly the input shaft of the blower has to point forward. On the 302's, and 5.0's, there's enough room to put it front of the valve cover, but on the 4.6L there's just no room.

So the only way to physically mount it is to turn it around and have the input shaft pointing towards the rear.

The Vortechs and Paxtons that are for the 4.6L are engineered to spin backwards and thus work fine.

Paxton: Normal Rotation (close to what I have)
http://www.paxtonauto.com/catalog/sy...t&Part=1001839

Paxton: Reverse Rotation (what I need )
http://www.paxtonauto.com/catalog/sy...t&Part=1001813

I need to take a close look and see if there is anything I can remove to make room for it facing forward.

Thanks for the reply. Anyone else?

97 Lincoln Mark VIII LSC (Chip'd, 3.73 T/L... so far... )
97 Ford Aspire (Slow, but getting 36 mpg (f'n Ethenol!! )
84 F250 Dually w/6.9L Diesel (7.3L IDI pending)
73 Mercury Cougar Convertible w/351C 4V (Partially Restored)
69 F100 LWB w/460 Engine
76 Glastron Carlson 23' Jet Boat w/460 CJ Engine
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post #4 of 5 (permalink) Old 12-01-2003, 02:35 PM
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Considering all the time and effort and taking into account the minimal power gains offered by a SN series supercharger, I would say you are better of purchasing a new Novi or Vortech unit with the appropiate brackets.

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post #5 of 5 (permalink) Old 12-01-2003, 03:00 PM Thread Starter
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I thought of that, but at around $3000, I just can't justify it for my daily driver.

But I can justify $1000 or so for boost into the daily driver.

I'm guessing a set of custom pulleys/gears will run around $300 - $400 so the balance would just be spent on brackets and hardware. (I already have the blower). I'm not looking for a huge amount of boost, only about 5 - 6 psi, if even that much.

I have access to a fabrication/welding shop that a buddy owns and we swap my computer work for his fabrication work, so a lot of the labor is free. Or I do the fabrication work myself with his equipment.

But, again, all input is appreciated. Thanks!

Anyone have an opinion on the bearing load or the “slipping” of the water pump pulley?

Keep the ideas/thoughts coming.

97 Lincoln Mark VIII LSC (Chip'd, 3.73 T/L... so far... )
97 Ford Aspire (Slow, but getting 36 mpg (f'n Ethenol!! )
84 F250 Dually w/6.9L Diesel (7.3L IDI pending)
73 Mercury Cougar Convertible w/351C 4V (Partially Restored)
69 F100 LWB w/460 Engine
76 Glastron Carlson 23' Jet Boat w/460 CJ Engine
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