|11-15-2012 06:23 PM|
I have been running a McCullough VS57 supercharger on a 340 horse 327 Chevy for about 5 years . In a
56 Studebaker Golden Hawk . The first thing I did was lower the compression to about 10 to 1 , I cut
the domes off the stock pistons to make them flat tops . Z28 hydraulic cam , I am using a highly modified
650 Holley double pumper in a blow thru application . The VS57 has a variable pulley . At normal speeds
it puts out about 2 lb pressure , it has a electronic kick down that opens the pulley and the pressure
goes to about 9 -10 pounds , this is adjustable . The fuel pressure problem was solved by using a stock
fuel pump and a electric pump set at 12 pounds . Under low pressure driving the stock pump gives it about 6
lbs of pressure , under high pressure the electric pump goes on with the electric kick down . A check valve
keeps the fuel from back feeding the electric pump and the stock pump phase one build in .
With a Muncie M21 and 4.56 gears it a fun ride .....
With a Paxton the box is the easiest way to go
|11-15-2012 01:07 PM|
|11-15-2012 12:02 PM|
this web site will help you with all ur needs and questions about blow thru carbs..
I'm running 12lbs of boost in my 68 mustang, engine is far from stock. Dont forget that you will need a bigger fuel pump & boost referenced. This site can teach you how to convert a holley into a blow thru carb. It's a chore to get the engine tuned, but i did mine all by myself.. and let me tell u.. its a fun ride when ur in boost.
i've been running this setup for about 2 years and its been trouble free and low maintance. Very dependable after you work all the bugs out.
|11-15-2012 10:30 AM|
Paxton supercharger on carb`d 70 Mustang
A friend of mine put a Paxton on a 1971 Duster 340. He had quite a few problems with it. The box (new) kept leaking around the grommets where the linkage went through, the floats had to be replaced with fiberfill floats because the pressure crushed the brass floats, and the carb had to be rejetted very rich to handle the extra air when under boost so it was too rich when he was just cruising. Other than that, with 10.5:1 compression ration and boost limited to 5 psi, it ran great (almost as fast as my 1970 Duster 340 with a cam). All this was on 100 octane gas. My suggestion is to go to a junkyard and buy a 5.0 Mustang fuel injection setup. You'll avoid a lot of problems. My friend finally took the Paxton off because it was too much trouble to maintain the leaks and bad gas mileage.
|11-15-2012 08:02 AM|
|1320 Bowtie||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.|
|11-15-2012 07:51 AM|
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.
|11-15-2012 07:43 AM|
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
|11-15-2012 07:12 AM|
|cadallac50||does anyone know wat supercharger to use on a 1950 cadillac with stock 331 motor n box|
|11-15-2012 01:29 AM|
|triffid98||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.|
|11-14-2012 10:04 PM|
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.
|11-14-2012 05:56 PM|
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 .
|11-10-2012 04:58 AM|
|south65ss||Ok guys, I think I will get a box and see what happen. Thanks to all.|
|11-09-2012 08:03 PM|
|Larry123||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.|
|11-09-2012 03:19 AM|
|south65ss||Yes, that`s what I wanted to do but I think I should do a lot of modifications to the carb. Right?|
|11-08-2012 05:52 AM|
|against all odds||
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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