Accelerator pump size

Discussion in 'Forced Induction Mopar' started by slowdown, May 9, 2018.

  1. slowdown

    slowdown Well-Known Member

    Messages:
    293
    Likes Received:
    7
    Joined:
    Jul 15, 2012
    Location:
    colorado
    View My Photos
    Local Time:
    10:36 AM
    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

    Messages:
    3,637
    Likes Received:
    824
    Joined:
    Feb 15, 2006
    Location:
    West Sacramento, CA
    Local Time:
    8:36 AM
    The pumps are only as big as the cams actuating the pump levers. What pump cams are installed?
     
    • Agree Agree x 2
    • slowdown

      slowdown Well-Known Member

      Messages:
      293
      Likes Received:
      7
      Joined:
      Jul 15, 2012
      Location:
      colorado
      View My Photos
      Local Time:
      10:36 AM
      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 Well-Known Member

      Messages:
      137
      Likes Received:
      81
      Joined:
      Sep 24, 2006
      Location:
      Creedmoor, NC
      Local Time:
      11:36 AM
      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 Well-Known Member

      Messages:
      137
      Likes Received:
      81
      Joined:
      Sep 24, 2006
      Location:
      Creedmoor, NC
      Local Time:
      11:36 AM
      They accelerator pump cover will be deeper. The arm is different also
       
    • brian6pac

      brian6pac Well-Known Member

      Messages:
      2,688
      Likes Received:
      1274
      Joined:
      Nov 15, 2016
      Location:
      N.E.Ohio
      Local Time:
      11:36 AM
      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.
       
      • Agree Agree x 1
      • roccodart440

        roccodart440 Well-Known Member

        Messages:
        4,678
        Likes Received:
        3682
        Joined:
        Apr 19, 2010
        Local Time:
        11:36 AM
        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

        Messages:
        3,250
        Likes Received:
        152
        Joined:
        Jun 8, 2007
        Location:
        warrenton, north carolina
        View My Photos
        Local Time:
        11:36 AM
        if it's working, leave it alone.
         
        • Agree Agree x 1
        • T56MaxTorq

          T56MaxTorq Well-Known Member

          Messages:
          793
          Likes Received:
          203
          Joined:
          Dec 21, 2010
          Location:
          CO
          Local Time:
          9:36 AM
          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.
           
          • Thanks! Thanks! x 1
          • Agree Agree x 1