Paxton supercharger on carb`d 70 Mustang - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-07-2012, 06:56 AM
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Paxton supercharger on carb`d 70 Mustang

Hi to all. I friend of mine just gave me a Paxton supercharger he had on a 90`s fuel injected Mustang. I have a bone stock 70 Mustang 302 and I want to install this thing and see how long stock pistons can live under boost. I been told I must get a dedicated carb for this and I been told I can put a "normal" carb inside a pressure box. Somebody also told me I can use a hat for the carb and thats all. What do you people think?

Thanks in advance!

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Old 11-07-2012, 09:47 AM
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Recalibrate the carb for forced induction. My freind used a AFB in a box for his 289. Cast pistons will last, so will hyper pistons, but use a msd btm. You just have less margin for error.

A 289 toploader with a paxton and 4.10's is a little terror.
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Old 11-07-2012, 01:51 PM
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Quote:
Originally Posted by south65ss View Post
What do you people think?
I think you'll find a way to overdo it and end up drivin' over the crank.
Guide To Blow-Through Superchargers - Car Craft Magazine
Blower Tuning
Centrifugal Supercharger - Tech Article - Chevy High Performance Magazine
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Old 11-07-2012, 07:33 PM
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In 1957 and again in '58 Special Order Ford racing cars (both T-Birds and some sedans) came with a Super Charger on the 312 Y Block V-8's. They went out and did some serious Trophy winning too in the west. I even saw one on a factory Y-block 332 V-8.
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Old 11-08-2012, 05:52 AM
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Another possibility to consider is to find/make an adapter that lets you run the carb draw-thru.

Much simpler in my opinion---then you don't have to mess with the carb box etc.
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Old 11-09-2012, 03:19 AM
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Yes, that`s what I wanted to do but I think I should do a lot of modifications to the carb. Right?
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Old 11-09-2012, 08:03 PM
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I put a Paxton on my 289 about 10 years ago, itís held up fine. Makes about 7 psi boost at 6K rpm. You will want a rev limiter to keep from getting carried away, it will want to rev to the stratosphere! Im using a 650 BG Mighty-Demon in the box.
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Old 11-10-2012, 04:58 AM
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Ok guys, I think I will get a box and see what happen. Thanks to all.
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Old 11-14-2012, 05:56 PM
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Blowjob

Studebaker owner of McCullough (Paxton) always used blow thru carbs mounted directly on intake manifolds mostly in pressure boxes a few Avanti pressure carbs . ALLWAYS with pressure relief valve on top of carb in case of backfire ! You do not want a pressurized fuel /air mixture backfirng thru the blower ! That reason NIXES suck thru ! 8.5/1 pistons worked fine for them but all their v 8s had forged crankshafts .
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Old 11-14-2012, 10:04 PM
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I'd say that you can run stock pistons and rods, but not bone stock.

Factory assembly clearances are not supposed to be exposed to excessive temperatures, that you meet in turbo/supercharger applications.

I mean, the piston ring gaps are too small for that much heat. And even if your pistons can withstand the heat, it's the rings which would expand, eliminate the gap and then - bang! - you get either broken ring lands or scratched cylinder bores.

You can run that Paxton with stock engine with a bit rich carb tune up (too cool pistons), until you won't pull it hard.

Proper clearances differ a stock engine from a race engine in a bone stock class.
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Old 11-15-2012, 01:29 AM
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You can certainly use a 'normal' carb inside a pressure box, just make sure it's jetted rich enough not to lean out during boost. This means it will run overly rich when it's not, so don't go crazy with it.
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Old 11-15-2012, 07:12 AM
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does anyone know wat supercharger to use on a 1950 cadillac with stock 331 motor n box
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Old 11-15-2012, 07:43 AM
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Quote:
Originally Posted by south65ss View Post
Hi to all. I friend of mine just gave me a Paxton supercharger he had on a 90`s fuel injected Mustang. I have a bone stock 70 Mustang 302 and I want to install this thing and see how long stock pistons can live under boost. I been told I must get a dedicated carb for this and I been told I can put a "normal" carb inside a pressure box. Somebody also told me I can use a hat for the carb and thats all. What do you people think?

Thanks in advance!

I would look in the antique Hot Rod Magazines . One thing I recall is replacing the float with a cork float. Just give the engine plenty of fuel. If it goes lean BANG!! Ron
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Old 11-15-2012, 07:51 AM
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If you have the carburetor box, I'd go that route. The Paxton set up was an option on the 66 Shelby. I had that setup on a 66 Hi-Po Mustang. I think it might have had 6 pounds of boost, maybe 8 pounds. One problem I had was with the fuel pump. Don't remember whether it was on the Mustang or a 57 Studebaker Golden Hawk I had. The Hawk came stock with a McCullough supercharger. They were later bought out by Paxton. Anyway, I had to run a pressure line to the pump because when the supercharger reached a higher pressure than the fuel pump it would shut down the fuel flow. I only bring that up because it was something that took me awhile to figure out.
If you want to go without the carb box, I'd google info on what you have to do to the carb to be blow through. I know the Studebaker Avante didn't use the box with a supercharger.
You'll notice quite an improvement in torque and all around performance.
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Old 11-15-2012, 08:02 AM
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It would be a good idea to do a leak down test & compression test on the 302 to make sure it's up to the added pressure from the supercharger. I'd also check the valve springs to make sure they can keep the valves from floating.
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