Building supercharged 350...Need help

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Jan 30, 2007 | 11:52 AM

sperkins

Thread Starter

Le Mans Master

Joined: Oct 2005

Posts: 9,429

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From: Macon, GA

Building supercharged 350...Need help

Ok it's not actually me, but my buddy is getting ready to yank his L82 from his '76 for a rebuild. He's wanting to run a blower. He would like a roots style blower, but he's thinking that a Vortec unit would be better due to clearance issues.
So - we need advice for EVERYTHING. What's the best way to do this? Pistons, heads, rods, carb selection etc...
He's hoping to get something that will fit under a stock L82 hood or he'll buy an L88 style..
Thanks guys.
Perk

Last edited by sperkins; Jan 30, 2007 at 03:33 PM.

Jan 30, 2007 | 12:03 PM

BigBadRed

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From: Check this riff........

I used to have a wiend 142 on my 76 and it cleared the stock hood.

Jan 30, 2007 | 12:05 PM

Durango_Boy

Team Owner

Joined: Aug 2006

Posts: 24,125

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From: Columbia Missouri

You know a PM to Norval and Glenn would be a good way to get pics and info. They are blower genius defined.

Jan 30, 2007 | 12:10 PM

big_G

Le Mans Master

Joined: Jul 2005

Posts: 5,752

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From: Austin Texas

Here is the supercharger link I started in December . I am using a ProCharger. http://forums.corvetteforum.com/show...ght=procharger

Jan 30, 2007 | 06:33 PM

sperkins

Thread Starter

Le Mans Master

Joined: Oct 2005

Posts: 9,429

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From: Macon, GA

Thanks guys. BIG - I bumped your thread. Thanks for that link. I still need to get some idea of internals to run and compression ratio.

Quote:

Originally Posted by BigBadOrange

I used to have a wiend 142 on my 76 and it cleared the stock hood

That may be the way to go. What kind of boost were you able to get out of that thing?

Jan 30, 2007 | 07:15 PM

BigBadRed

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From: Check this riff........

Not really sure what I had it at, but here is a link to it. Says UP to 12 psi. But I thought I read its only good up to about 450hp.

http://www.holley.com/HolleyNews/article.asp?ID=14

Jan 30, 2007 | 09:10 PM

sperkins

Thread Starter

Le Mans Master

Joined: Oct 2005

Posts: 9,429

Likes: 44

From: Macon, GA

Quote:

Originally Posted by BigBadOrange

Not really sure what I had it at, but here is a link to it. Says UP to 12 psi. But I thought I read its only good up to about 450hp.

http://www.holley.com/HolleyNews/article.asp?ID=14

Cool Thanks. But, no way that sucker is going to fit under a stock L82 hood with a carb.

Jan 30, 2007 | 09:27 PM

Durango_Boy

Team Owner

Joined: Aug 2006

Posts: 24,125

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From: Columbia Missouri

Quote:

Originally Posted by sperkins

Cool Thanks. But, no way that sucker is going to fit under a stock L82 hood with a carb.

Maybe that's how it fit...it didn't have a carb or breather...

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Jan 31, 2007 | 05:27 AM

Ratsirt

Burning Brakes

Joined: Nov 2004

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From: Ontario

There is no way a 142 fits under a stock hood with a carb. The carb without cleaner on mine protrudes around 4 inches on my stock 71 hood.

Jan 31, 2007 | 08:21 AM

#10

bashcraft

Le Mans Master

Joined: Jan 2006

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From: Butler Pa

Quote:

Originally Posted by sperkins

Thanks guys. BIG - I bumped your thread. Thanks for that link. I still need to get some idea of internals to run and compression ratio.

The static comp ratio should be adjusted according to the maximum boost you will be running. Since a blower does a great job of mixing the air/fuel mixture, you can usually run a dynamic comp ratio slightly higher than a normaly aspirated motor, probably close to 11-1.

The last blower motor I worked on was a 427 with a 8-71 Mooneyham compressor. We set the static comp ratio at 5.6-1 which allowed us to run about 22 pounds of boost.

Jan 31, 2007 | 10:16 AM

#11

Durango_Boy

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From: Columbia Missouri

Quote:

Originally Posted by Ratsirt

There is no way a 142 fits under a stock hood with a carb. The carb without cleaner on mine protrudes around 4 inches on my stock 71 hood.

You have the Holley blower? That's cool looking.

Jan 31, 2007 | 10:24 AM

#12

Ratsirt

Burning Brakes

Joined: Nov 2004

Posts: 821

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From: Ontario

Yes a 144. Here is a couple pics when I was installing last spring.

Have only put a few hundred miles on it since I am always away, as I am again.

Norval gave me some help with tuning last spring. Will be adding a 750 blower carb when I pull it out of storage in the spring along with a few more mods. Hopefully going to install a 200-4R and 3.55 gears also.

http://i3.photobucket.com/albums/y80...ngineRR010.jpg

http://i3.photobucket.com/albums/y80...ngineRR008.jpg

Jan 31, 2007 | 10:28 AM

#13

Durango_Boy

Team Owner

Joined: Aug 2006

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From: Columbia Missouri

Quote:

Originally Posted by Ratsirt

What'd you do about a hood? Cut your stock one?

Jan 31, 2007 | 10:37 AM

#14

Ratsirt

Burning Brakes

Joined: Nov 2004

Posts: 821

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From: Ontario

Yes I did. This year though I am looking at possibly installing a cowl scoop or new hi rise hood.

http://i3.photobucket.com/albums/y80...ngineRR018.jpg

http://i3.photobucket.com/albums/y80...ngineRR019.jpg

Jan 31, 2007 | 10:56 AM

#15

luerja

Melting Slicks

Joined: Dec 2004

Posts: 2,101

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From: Cruising somewhere in St. Louis, Missouri

here is a link to the first supercharger upgrade i did last summer, every has changed with the new 6-71 project and i'll have pics of that here soon.
http://jimluer.com/Images/Blower%20Project.html

This was done on a 72 convertible

Jan 31, 2007 | 11:39 AM

#16

BigBadRed

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From: Check this riff........

Quote:

Originally Posted by sperkins

Cool Thanks. But, no way that sucker is going to fit under a stock L82 hood with a carb.

Now that I think about it, I was thinking of the front pulley, not the carb. I had converted to throttle body fuel injection and although close, it fit. The manifold that comes with the supercharger is almost concave.

Jan 31, 2007 | 11:44 AM

#17

BigBadRed

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From: Check this riff........

Quote:

Originally Posted by Ratsirt

There is no way a 142 fits under a stock hood with a carb. The carb without cleaner on mine protrudes around 4 inches on my stock 71 hood.

4 inches?!?!? how different is the engine height and hood on a 71 vs a 76. Mine was close, but definately fit with a carb and no air cleaner. Can't imagine it sticking out that far. Does the B&M 144 have different dimensions then the weind 142?