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Old 04-17-2006, 09:45 PM
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Direct drive crank driven supercharger.

I think it would be a definate conversation piece to put a direct drive crank driven front mount supercharger in my 36 ford pickup. its has a SBC. has anyone ever attemped this? i know it has been done in the past but i can't find any real info on it. i was reading #24 of The Rodder's Journal and it featured the Competition Coupes. the SO-CAL coupe had a ardun headed flat head with a direct front drive GMC 4-71 blower. i want to re-create this on my truck. i was thinking of using a Weiand 142 blower. as for the carb intake and the discharge tube to the motor i have that pretty much figured out. my questions are:

if i took the blower and coupled the nose directly to my crank the blower would spin backwards, is the nose of the supercharger interchangeable between the front and the back of the casing to reverse it?

if i direct drive it, would the 1:1 ratio produce enough boost? im looking to get 5psi.

can the blower be mounted on its side? im worried about if the oiling system of the gears would still be alright.

thanks!
ill have more question very shortly im sure.
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Old 04-17-2006, 10:58 PM
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using the formula 25.58 x 142 x 1 / 350 = 10.38 - 14.7 = -4.32psi! that isnt going to work! so i have to figure out how to drive it so the blower has around a 1.95 ratio.

any ideas? im thinking small belt but im not sure if they make belts that small.
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Old 04-17-2006, 11:51 PM
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Potvin used to market that particular front blower setup and it did look pretty neat. The reason you don't see them anymore is that as soon as you hang an intake valve or the motor hiccups from a lean condition, you have a large pipe full of very combustible fuel/air mixture just waiting to blow the front off the car.
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Old 04-18-2006, 12:32 AM
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lol yes i have thought about that, ill be running a large BOV of some type, im hopping it can bleed that pressure off during a backfire.
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Old 04-18-2006, 12:33 AM
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Quote:
Originally Posted by Super Chevy
lol yes i have thought about that, ill be running a large BOV of some type, im hopping it can bleed that pressure off during a backfire.
Good luck.
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Old 04-18-2006, 01:07 AM
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How about a timing belt and gears? It would give you a 2:1 ratio.

Have you thought about the heat build up that occurs in a long, high volume intake track? My understanding is that since a roots type supercharger builds compression in the intake manifold rather than the blower housing, mounting one further away from the intake ports creates more heat than actual boost.
Would you consider a different type of supercharger?
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Old 04-18-2006, 08:43 AM
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Actually building an engine right now with a Potvin setup. The biggest issue in most cars is spacing in front of the engine.
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Old 04-18-2006, 11:08 AM
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A friend of mine is doing this in a 1979 camaro. Its a procharger in front of a 540 BBC.

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Old 04-18-2006, 11:11 AM
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Quote:
Originally Posted by bigbadbowtie
A friend of mine is doing this in a 1979 camaro. Its a procharger in front of a 540 BBC.



Different deal, the Potvin stuff actually uses a Roots supercharger. They were very common in "Streamliner" LAnd Speed Record stuff to keep everything low.
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Old 04-18-2006, 11:12 AM
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aaahhhh.... now that sounds like a cool setup!!!!! I have never seen that before.


edit.. something like this

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Old 04-18-2006, 05:47 PM
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im going for looks more than anything. im not running a rad in the front if i do this setup, the rad will be at the back. if i were to use a timing belt setup i would still need to figure out how to reverse the supercharger and find an extremely small belt.
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