Potvin Supercharger Build PROJECT

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3x2stude
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Potvin Supercharger Build PROJECT

Post by 3x2stude » 14 Jan 2020, 21:47

I know I have several other projects on this site that are not done but I got hooked on the old school "Potvin" supercharger and I started another project. I plan to do it with a 471 GMC blower. The adapter housing in the photos is a theoretical mock up. 3D modeling has been started for the real housing. Once it is modeled I will need to determine if it is cost effective to have it machined from billet or do a weldment and then machine. The mock up allows me to build the inlet and outlet plumbing ahead of the adapter. The outlet side of the blower will need drilled and tapped for the needed plumbing. The base side is usually "carved off" so you will not see it in current internet photos. I bought every '56 - '61 Car Craft and Hot Rod that mentioned the Potvin supercharger and they made it pretty clear how it was done. If you are not familiar with the Potvin style blower just google it. More to follow.

JK
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Mike Van Veghten
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Re: Potvin Supercharger Build

Post by Mike Van Veghten » 15 Jan 2020, 02:01

The Studebaker museum will have to clean up a corner somewhere to show off all of your projects.

Mike

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PackardV8
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Re: Potvin Supercharger Build

Post by PackardV8 » 15 Jan 2020, 11:18

Why does the drive adapter need to be longer than the SBC unit?

jack vines

3x2stude
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Re: Potvin Supercharger Build

Post by 3x2stude » 15 Jan 2020, 12:25

Jack,

Good question. I only guessed at 5.00" for now. The crank sticks out 3.00" past the gear cover, half of the chain coupler will be beyond that and the blower gears stick out of the case about an inch. I may be short for all I know. The mock up can be shortened but I should be fine for what it's purpose is, fitting up the intake side. If I do all the intake tubes traditionally I can adjust the length with the horizontal tube. Once I get the chain coupler from Moon then I can do the math and finish the 3D model. Until it arrives I am on hold with the adapter so hence the mock up to keep moving forward. I attached an early hemi Potvin adapter and its fairly long.

JK
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3x2stude
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Re: Potvin Supercharger Build

Post by 3x2stude » 15 Jan 2020, 13:13

Anybody out there have an outlet box for 671 or a 471 on a Potvin? I would buy but I would also be happy with just some dimensions.

JK
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PackardV8
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Re: Potvin Supercharger Build

Post by PackardV8 » 15 Jan 2020, 13:50

If you want everything period-correct, then you've got to use that very large, very heavy, very inefficient GMC.

If one just wants the look of a front mounted supercharger in a much lighter, much more efficient and to my eye, better looking unit, any of the several more recent Eaton/Magnusson TVS high helix superchargers are an option.

Image

jack vines

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Mike Van Veghten
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Re: Potvin Supercharger Build

Post by Mike Van Veghten » 15 Jan 2020, 17:33

I was going to ask about the "long" drive tubes too, but figured it's easier to shorten them than to add to them.
One one hand, I understand Jacks reasoning, but no...an old engine, and an old drive assembly, needs to be an old 6-71 (OR...4-71!) blower.

Mike

3x2stude
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Re: Potvin Supercharger Build

Post by 3x2stude » 15 Jan 2020, 20:49

Jack,

I know there are better choices if I want "efficiency" but that is not the goal here so lets not steer this thread that direction.

JK

3x2stude
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Re: Potvin Supercharger Build

Post by 3x2stude » 06 Feb 2020, 22:02

Update-

I have lots of drawings in the works for the "non adapter" pieces and am in a holding pattern on those fabrications. I switched to mocking up the block to blower adapter in wood to help understand where the offsets and fastener accesses needs to be. The mock up will make it easier to determine how best to fabricate in metal.

JK
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3x2stude
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Re: Potvin Supercharger Build

Post by 3x2stude » 06 Feb 2020, 22:05

Some more photos. The front plate is the blower surface. I just need to fill in the gap.

JK
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Mike Van Veghten
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Re: Potvin Supercharger Build

Post by Mike Van Veghten » 07 Feb 2020, 02:46

Very cool stuff...

Took a few pictures of the "Orange Crate" (yea, the original), orange sedan, at the Grand National Roadster Show the other weekend.
I thought of you when looking at that and the yellow Moon dragster that was in another building.

Mike

3x2stude
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Re: Potvin Supercharger Build PROJECT

Post by 3x2stude » 08 Feb 2020, 09:08

Mike,

Post a picture of the Orange Crate, I remember building it as a kid.

JK

3x2stude
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Re: Potvin Supercharger Build PROJECT

Post by 3x2stude » 08 Feb 2020, 09:58

I have some questions for those that have way more experience than me with the Stude motor. I am concerned about maintaining proper crankshaft thrust clearance and cam gear oiling. By design of the system will not have a front hub with a bolt holding it all on the front of the crank.

1. Will the cam gear on the crank stay in place with just the press fit holding it?

2. Do I need the oil slinger in front of the gear to feed oil to the top gear on the cam?

3. Will I need some sort of baffling inside my casting to simulate the original gear cover to aid in oiling the gears?

I am confidant that I could add the bolt back into the mix but it will be a more costly. Let me know your thoughts. Gunna do this no matter how complicated it gets. :)

JK

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Mike Van Veghten
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Re: Potvin Supercharger Build PROJECT

Post by Mike Van Veghten » 08 Feb 2020, 14:03

Sure.
What's the pixel size max, or the MB size max that I need to shrink the pictures to ?

Questions from above -
1. I'd imagine that the press fit will hold the gear on. In the old days, many a drag race engine ran without a damper doing double duty to hold the crank gear in place. I never saw or heard of anyone having trouble loosing the crank gear. But again, that was short distance, but high rpm.

2. Unless you blocked the hold in the block that sprays the gears, you'll be more than fine, cam gear oil wise. And add to that, the oil coming out of the front main, even without a slinger, is going to get sprayed around into a nice heavy mist. Again, isn't that(the factory slinger) one of the first things folks that rebuilt engines, for the street or racing threw away..!

3. See #2. Seems that baffling will only separate the oil coming out of the main bearing from going up into the gear. If you don't have the original spray hole in the block and are concerned, just add a line from a pressure source and point it to the cam gear. But I would not until you see any problem. I'd say that the factories hole in the block for the gear oiling is more than enough.

Mike

3x2stude
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Re: Potvin Supercharger Build PROJECT

Post by 3x2stude » 10 Feb 2020, 23:38

Thanks for the input Mike.

JK

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