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1967 shelby gt350 paxton supercharger help?

Discussion in '1965-1970 Shelby Mustang GT350 & GT500' started by nickthecarver, Jul 6, 2011.

  1. Jul 6, 2011 #1
    nickthecarver

    nickthecarver Member

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    My dad has a 67 shelby with a paxton blower. SN92 blower i think. anyway he recently has had some carburater problems so he bought a holley 4150 hp carb for it. We where trying the new carb in the supercharger bonnet and the linkage wont fit. Is there anyone that has experienced with this problem of getting the carburetor to fit in this bonnet. Or is there a newer aftermarket bonnet that is bigger so that he could use his new carb?

    Thanks Nick
     
    nickthecarver, Jul 6, 2011
    nickthecarver, Jul 6, 2011
    #1
  2. Jul 7, 2011 #2
    mrmustang

    mrmustang Well-Known Member

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    Please post pictures so we can assist.
     
    mrmustang, Jul 7, 2011
    mrmustang, Jul 7, 2011
    #2
  3. Jul 10, 2011 #3
    66GT350PS

    66GT350PS Well-Known Member

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    contact the early Paxton Supercharger expert:

    Craig Conley at Paradise Wheels


    B)
     
    66GT350PS, Jul 10, 2011
    66GT350PS, Jul 10, 2011
    #3
  4. Jul 10, 2011 #4
    zrayr

    zrayr Well-Known Member

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    I've used several different Holleys and Autolite carbs in my Paxton equipped cars. What holley is he trying to use ? A 4150 with modern cathedral float bowls should fit, even if the choke tower has not been milled off. Did he buy a Holley with the LeMans bowls? They won't fit but you can sell them easily enough.

    Photos ?

    once the photos below have been opened in photobucket, click on them to get a full size picture.

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    Z.
     
    zrayr, Jul 10, 2011
    zrayr, Jul 10, 2011
    #4
  5. Jul 16, 2011 #5
    nickthecarver

    nickthecarver Member

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    nice car. that is the same blower my dad has. what carb r u running. because we have a 4150 hp but the linkage does not fit in the bonnet. did you buy diffent linkage for it or did you modify the linkage? and what is that extra line that t's off before the line enters the bonnet. is it a fuel pressure regulater or what?
     
    nickthecarver, Jul 16, 2011
    nickthecarver, Jul 16, 2011
    #5
  6. Jul 16, 2011 #6
    zrayr

    zrayr Well-Known Member

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    it is this carb:

    http://www.summitracing.com/parts/HLY-0-82651/

    my linkage fits fine. If yours doesn't fit, contact Craig Conley of Paradise Wheels. I'm sure he can sell you the correct linkage for your needs.

    The extra line goes to to an isolator. Gas flows into one side of the isolator. The isolator is divided into two cavities separated by a diaphragm. On the other side of the diaphragm the cavity is filled with antifreeze/water. A line from that side runs into passenger compartment & into the fuel pressure gauge. An increase in fuel pressure pushes the gas against the diaphragm which pushes against the antifreeze, which registers the gage. It's just a safely measure to keep a gas line out of the passenger compartment.

    http://www.summitracing.com/parts/MAA-29806/

    Photo taken at idle w/ cold engine., From left to right:
    Boost pressure: 0 psi
    Fuel Pressure: 6.5 psi
    air fuel ratio: 13.1:1
    vacuum: 18 inches
    oil pressure: 72 psi (hot engine oil pressure is about 30 psi at idle)



    [​IMG]




    Z.
     
    zrayr, Jul 16, 2011
    zrayr, Jul 16, 2011
    #6
  7. Jul 17, 2011 #7
    nickthecarver

    nickthecarver Member

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    that is the exact same carb that i have but my linkage is black and doesnt fit.Do you think holley could hook me up with some difrent linkage.
    and do you think i could run a fuel pressure regulater with the bonnet and everything.
     
    nickthecarver, Jul 17, 2011
    nickthecarver, Jul 17, 2011
    #7
  8. Jul 17, 2011 #8
    zrayr

    zrayr Well-Known Member

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    can you take a photo of exactly what part of the linkage doesn't fit and post it? Often a hacksaw or dermal tool is needed to cut off the large "hoop" part of the carb linkage that sometimes hits the lower half of the carb bonnet.

    you shouldn't be needing a fuel pressure regulator. The pressure is regulated solely by the boost reference line going from the blower outlet to the top half of the fuel pump. When the blower pressure goes up, the fuel does automatically.

    Z.
     
    zrayr, Jul 17, 2011
    zrayr, Jul 17, 2011
    #8
  9. Jul 18, 2011 #9
    nickthecarver

    nickthecarver Member

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    well zrayr u have been a really big help.thank you. do you have any troubles getting the plumbing fittings to make the corner of the float bowl and bonnet. Because on our shelby we had to pinch the 90 degree bends on the plumbing off of the float bowls.
     
    nickthecarver, Jul 18, 2011
    nickthecarver, Jul 18, 2011
    #9
  10. Jul 19, 2011 #10
    zrayr

    zrayr Well-Known Member

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    this is what you need:

    [​IMG]


    CLAMP STYLE 90° MALE ELBOW

    Edelmann # 822550 Inverted Flare Tube 5/16” Hose Size 5/16”

    or

    Edelmann # 822560 Inverted Flare Tube 5/16” Hose Size 3/8”

    or

    Edelmann # 822660 Inverted Flare Tube 3/8” Hose Size 3/8”


    I've used the # 822550 & currently the # 822660. I wanted to use the bigger 3/8" fitting as I had gone to 3/8" fittings and fuel line for the rest of the fuel system. I did have to grind off the corner of the fitting and a little off of the inner bonnet to get it fit. If I had it to do over again I would just go with the 5/16" which fits without grinding anything. The 3/8" fitting is absolutely overkill to have on each bowl.

    A quality auto parts store will have an edelmann fittings display.

    http://www.plews-edelmann.com/brochure.cfm?brochure=1865&location_id=2516

    http://www.plews-edelmann.com/index.cfm?location_id=2516

    http://www.plews-edelmann.com/downloads/download_common.cfm?file=90078.pdf&folder=brochure


    Z.
     
    zrayr, Jul 19, 2011
    zrayr, Jul 19, 2011
    #10
  11. Jul 20, 2011 #11
    nickthecarver

    nickthecarver Member

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    what size fuel line do you use from the fuel pump all the way up. 5/16 or 3/8
     
    nickthecarver, Jul 20, 2011
    nickthecarver, Jul 20, 2011
    #11
  12. Jul 20, 2011 #12
    zrayr

    zrayr Well-Known Member

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    3/8"

    I couldn't find one in 3/8", so I bought a tubing bender at Sears and learned how to bend it myself. After a few mis-steps I came up a few that were passable.

    Z.
     
    zrayr, Jul 20, 2011
    zrayr, Jul 20, 2011
    #12
  13. Feb 25, 2012 #13
    zrayr

    zrayr Well-Known Member

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    check post #7 by the OP. He was having trouble with the linkage fitment, not the choke tower or float bowls, etc.

    Z.
     
    zrayr, Feb 25, 2012
    zrayr, Feb 25, 2012
    #13
  14. Feb 25, 2012 #14
    2+2GT

    2+2GT Well-Known Member

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    I'm really concerned about terms here. It's way past time we saw a photo of the problem. Since the "linkage" is not part of the carburetor, I don't see how the carburetor is the problem. Holley can't fix what they don't make.

    If the throttle lever on the carb is the problem, that can usually be fixed in a few minutes with a 1/8" drill, or sheet metal punch.
     
    2+2GT, Feb 25, 2012
    2+2GT, Feb 25, 2012
    #14
  15. Feb 25, 2012 #15
    zrayr

    zrayr Well-Known Member

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    we are using the term linkage here to include the Holley fittings at the end of the throttle shafts. Sorry if that was confusing & not precise enough. In post #8 I describe the issue I had with the round hoop that (is part of the Holley carb) which hits the Paxton enclosure.

    Z.
     
    zrayr, Feb 25, 2012
    zrayr, Feb 25, 2012
    #15
  16. Feb 25, 2012 #16
    TLEA

    TLEA Well-Known Member

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    Exactly. If you were using a period 4150 (non LeMans bowl) the Holley throttle shafts wouldn't be an issue. By using a more modern Holley like the 650 he is talking about the loop used to work the later kickdown shaft needs to be cut off
     
    TLEA, Feb 25, 2012
    TLEA, Feb 25, 2012
    #16

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