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Vacuum secondaries with boost?

Discussion in 'Carbination Lounge' started by Inline Adam, Jul 11, 2019.

  1. Inline Adam

    Joined:
    Dec 5, 2018
    Hey!
    I was wondering if vacuum secondaries would work under boost? I’ve never really considered how they work, so I’m wondering if anyone uses them on boosted application.

    I am currently using a Holley 4412 500 2 barrel and am having some tuning issues. Also, it’s been suggested that I may not have enough cfm for my application... though the math says 509cfm at 15 psi and 6000RPM.

    Cheers!
     
    Inline Adam, Jul 11, 2019
    #1

  2. 91turboterror

    Joined:
    Mar 17, 2013
    One way is if your entire carb is inside an enclosure.
     
    91turboterror, Jul 12, 2019
    #2
    MidmoJoe likes this.

  3. BlownShovel

    Joined:
    Apr 29, 2003
    yep -- carb enclosure/box is generally the method
     
    BlownShovel, Jul 15, 2019
    #3

  4. ng8264723

    Joined:
    Feb 3, 2003
    Boxes are expensive and leaks are a pain. What are you boosting?
     
    ng8264723, Jul 24, 2019
    #4

  5. Inline Adam

    Joined:
    Dec 5, 2018
    Sorry, just saw this now.
    I’m blowing through a Holley 500 2 barrel right now. It’s on a Chevy 250 inline 6 @ 15 psi.
     
    Inline Adam, Aug 14, 2019
    #5

  6. fastspec2

    Joined:
    Dec 24, 2009
    Measure the boost below and above the throttle blade and compare. That will tell you how much of a restriction the carb is.
     
    fastspec2, Aug 14, 2019
    #6

  7. ng8264723

    Joined:
    Feb 3, 2003
    Post some pics of your setup. If it's running already why mess with a box?
     
    ng8264723, Aug 31, 2019
    #7
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