Accelerator pump size

Forced Induction Mopar

  1. slowdown

    slowdown Well-Known Member

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    i have 2 750dp Holley part#80573s an they have the duel 50cc accelerator pumps. My question is are these pumps to big? The racier 750dp part#80576s has 30cc pumps and that’s got me to thinking. Should I be starting with smaller pumps. Ive been driving it around town an it’s crazy but may be a little rich yet. But it doesn’t spit sputter or bog an I haven’t fouled any plugs. So I’m just not sure if smaller pumps would matter in my case. And I don’t know if I would gain anything. Any thoughts on this would be appreciated. Thanks.
     
  2. mopowers

    mopowers Well-Known Member

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    The pumps are only as big as the cams actuating the pump levers. What pump cams are installed?
     
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    • slowdown

      slowdown Well-Known Member

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      I can’t see any numbers but there red if that can tell you anything. I will have to look at the site an see if it says what size there shipped with.
       
    • dusted

      dusted FABO Gold Member FABO Gold Member

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      Depends on the cubic inch. My 318 gets by with dual 30s but the 390 has a 30 primary and a 50 secondary. You can change jets up and down to accommodate. The truck goes to an immediate 11.0 as soon and it is at WOT. But then settles in to a 11.8-12.2 once the rpm come up. With the 50cc secondary it would bog to a 10.0 and never really recover much past a 10.9.
      Just use what works the best. Read the plugs.
       
    • dusted

      dusted FABO Gold Member FABO Gold Member

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      They accelerator pump cover will be deeper. The arm is different also
       
    • brian6pac

      brian6pac Well-Known Member

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      Pumps are for launch, jets are for WOT. I run 50cc pumps and pink cams and they are the most adjustable also the squirter nozzle makes a big difference.
       
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      • roccodart440

        roccodart440 Well-Known Member

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        I actually just looked at my carb online just so I could tell you what accelerator pump size I run and cant' seem to find it listed anywhere.
         
      • bOb shingler

        bOb shingler Well-Known Member

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        if it's working, leave it alone.
         
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        • T56MaxTorq

          T56MaxTorq Well-Known Member

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          An AFR gauge really helps with accelerator pump rigging. When stomping the pedal, you should see 13.5, when you stop it should transition easily into wot mixture, usually 13-13.5. There shouldn’t be any fluctuations or lean outs, nothing over 14.

          Ignition and timing health play a big part in this too and should always be checked first.
           
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