Edelbrock carb adjustment

Mopar Racers Forum

  1. skrews

    skrews Well-Known Member

    Messages:
    1,578
    Likes Received:
    1120
    Joined:
    Jul 20, 2012
    Location:
    Washington state
    Local Time:
    8:37 PM
    Who knew it was this simple.

     
    • Like Like x 2
    • Thanks! Thanks! x 1
    • fishmens67

      fishmens67 Well-Known Member

      Messages:
      8,412
      Likes Received:
      6079
      Joined:
      Nov 10, 2012
      Location:
      idaho
      Local Time:
      10:37 PM
      looks about right. lol
       
      • Thanks! Thanks! x 1
      • Johnny Dart

        Johnny Dart Well-Known Member

        Messages:
        7,960
        Likes Received:
        2519
        Joined:
        Nov 30, 2006
        Location:
        So Cal
        Local Time:
        8:37 PM
        That's what happens when you never make it past 6th grade.
         
        • Agree Agree x 4
        • Like Like x 3
        • fishmens67

          fishmens67 Well-Known Member

          Messages:
          8,412
          Likes Received:
          6079
          Joined:
          Nov 10, 2012
          Location:
          idaho
          Local Time:
          10:37 PM
          No, that's what happens when you finally figure out a Holley is worth 2 tenths. lol
           
          • Agree Agree x 2
          • Thanks! Thanks! x 1
          • Disagree Disagree x 1
          • Johnny Dart

            Johnny Dart Well-Known Member

            Messages:
            7,960
            Likes Received:
            2519
            Joined:
            Nov 30, 2006
            Location:
            So Cal
            Local Time:
            8:37 PM
            Blah Blah Blah
            Let me know when you want to line your 2 tenths up.
             
            • Like Like x 2
            • fishmens67

              fishmens67 Well-Known Member

              Messages:
              8,412
              Likes Received:
              6079
              Joined:
              Nov 10, 2012
              Location:
              idaho
              Local Time:
              10:37 PM
              :rolleyes:
               
              • Thanks! Thanks! x 1
              • Johnny Dart

                Johnny Dart Well-Known Member

                Messages:
                7,960
                Likes Received:
                2519
                Joined:
                Nov 30, 2006
                Location:
                So Cal
                Local Time:
                8:37 PM
                And this is how the great Holley Edelbrock debate started. :)
                 
                • Like Like x 2
                • Agree Agree x 2
                • RustyRatRod

                  RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

                  Messages:
                  64,696
                  Likes Received:
                  37646
                  Joined:
                  Jun 7, 2010
                  Location:
                  Georgia
                  Local Time:
                  11:37 PM
                  That guy's a real dumbass.
                   
                  • Agree Agree x 4
                  • Hysteric

                    Hysteric Well-Known Member

                    Messages:
                    269
                    Likes Received:
                    126
                    Joined:
                    Dec 31, 2005
                    Local Time:
                    10:37 PM
                    The Carter design is just too hard for some folks to figure out.
                     
                    • Agree Agree x 1
                    • RustyRatRod

                      RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

                      Messages:
                      64,696
                      Likes Received:
                      37646
                      Joined:
                      Jun 7, 2010
                      Location:
                      Georgia
                      Local Time:
                      11:37 PM
                      Well the thing is, one style carburetor is not necessarily better than the other. They are simply different. Metering rod carburetors by nature "don't like" engines with low vacuum signals.....lumpy camshafts, that kinda thing, so they are really geared more toward "stockish" builds that have good vacuum signals. The poor vacuum signal of a really hot engine can cause the metering rods to bounce at idle and really be tough to down right impossible to tune. That's when it's time to step into a Holley. They are much better suited to hotter engines with lower vacuum signals. So it's not which carburetor is "better overall" but which carburetor is "better suited" and a lot of people don't get "THAT". The Carters are actually very, very simple. It's when they are used outside of their element that gets people in trouble.
                       
                      • Agree Agree x 9
                      • Like Like x 1
                      • Thanks! Thanks! x 1
                      • Hysteric

                        Hysteric Well-Known Member

                        Messages:
                        269
                        Likes Received:
                        126
                        Joined:
                        Dec 31, 2005
                        Local Time:
                        10:37 PM
                        Have you ever compared the idle circuit design between a Holley and a Carter to understand why the Carter idles better?
                         
                      • RustyRatRod

                        RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

                        Messages:
                        64,696
                        Likes Received:
                        37646
                        Joined:
                        Jun 7, 2010
                        Location:
                        Georgia
                        Local Time:
                        11:37 PM
                        The Carter does not idle better under low vacuum signal conditions. The Holley does. Once your vacuum signal falls below about 11Hg, The Carter starts having problems. I suspect the Carter probably does idle somewhat better with a strong vacuum signal because of its booster design.
                         
                        • Agree Agree x 1
                        • Hysteric

                          Hysteric Well-Known Member

                          Messages:
                          269
                          Likes Received:
                          126
                          Joined:
                          Dec 31, 2005
                          Local Time:
                          10:37 PM
                          With 9 inches of vacuum the Edelbrock idled better than the Holley. I even went as far as converting the Edelbrock primary boosters to work like the Holley by drilling out the economizer jet and blocking the by-pass so it had only one air bleed controlling it like a Holley and guess what it idled just like the Holley did and worked just like the Holley with 1.5 turns
                          Again the Carter Design is better but you need to understand why.
                           
                          • Like Like x 2
                          • Thanks! Thanks! x 1
                          • yellow rose

                            yellow rose Overnight Sensation

                            Messages:
                            24,573
                            Likes Received:
                            20582
                            Joined:
                            Jun 19, 2015
                            Location:
                            Under The Gun
                            Local Time:
                            8:37 PM

                            The Holley (or better yet, any decent Holley clone) will out idle, out power and just straight out perform the Carter style carbs.

                            The biggest problem with Holley and Holley clones was, is and evidently will forever be Holley. They continue to miseducated the public on how their carbs function, send out anything even close to a performance carb double PIG rich at idle, sloppy in transition somewhat clean in the middle and PIG fat at WOT.

                            All that is relatively easily corrected. As per normal, the books produced for these carbs are basically worthless for most anything other that learning the most very basic aspects of the carb.

                            When a “technical” book, written for and purchased by guys who at least on some level, want to learn to tune this stuff starts out with this remark (or a paraphrase of it) “changing the different circuits is a complex matter and should be only done by the experts and not at home...more damage has been done to these carbs by guys at home with drill bits than anything else...don’t junk your carb by going crazy and drilling holes...the Holley carb is very close with its factory calibrations, therefore most anything you may do will be wrong, or worse...”.

                            That is WORTHLESS, stupid and a waste of paper. While carb function and science is complex, if you can lash valves correctly and use a timing light like it was meant to be used, you can understand carb function, the circuits involved and how changing one circuit can and will affect another. And you can understand where to start, and what to do next with pretty basic knowledge.

                            The Carter/Edelbrock carbs, by their design are much more difficult to alter, and as the power level goes up, much more difficult to correct because the main jet/metering rods are never separate, where the Holley style carbs have a separate main jet/power enrichment circuit.

                            For the guys who want a simple, bolt on and forget it carb, the Carter/Edlebrock carbs are what they need. They will be close enough that much tuning won’t be needed.

                            For the guys that want to get the most power, or even economy, the Holley style carbs are infinitely more adjustable. The level of tune achieved with this style carb is only limited by how much time you are willing to invest learning the basics, and buying some pin gauges, drill bits and brass.
                             
                            • Agree Agree x 3
                            • rumblefish360

                              rumblefish360 So close, yet so far away FABO Gold Member

                              Messages:
                              39,068
                              Likes Received:
                              10625
                              Joined:
                              Jun 21, 2005
                              Location:
                              New York, on a Island
                              Local Time:
                              11:37 PM
                              The Holley has way more adjustment/adjustable/replaceable/tunable/customized parts that can be swapped out. This is what kills most guys.

                              The Carter’s metering rods can get pretty low for the vacuum signal. They really shouldn’t have a big issue.

                              I have to agree with RRR & Yellowrose on there assertions.

                              Also, that guy is a dumb ass.
                               
                              • Like Like x 1
                              • Agree Agree x 1
                              • toolmanmike

                                toolmanmike FABO MODERATOR Staff Member FABO Gold Member

                                Messages:
                                53,019
                                Likes Received:
                                38531
                                Joined:
                                Jan 18, 2006
                                Location:
                                Iowa
                                Local Time:
                                10:37 PM
                                Bolt it on and it would still work!
                                 
                              • krazykuda

                                krazykuda Well-Known Member FABO Gold Member How-To Section Editor

                                Messages:
                                55,246
                                Likes Received:
                                20561
                                Joined:
                                Aug 20, 2007
                                Location:
                                Orland Park, IL
                                Local Time:
                                10:37 PM

                                Well said... :thumbsup:
                                 
                                • Agree Agree x 1
                                • PRH

                                  PRH Well-Known Member

                                  Messages:
                                  2,607
                                  Likes Received:
                                  3955
                                  Joined:
                                  Dec 14, 2018
                                  Location:
                                  So. Burlington, Vt
                                  Local Time:
                                  11:37 PM
                                  For the “racier” builds.......Holleys, or Holley clones for me, thanks.
                                   
                                  • Agree Agree x 4
                                  • Like Like x 1
                                  • toolmanmike

                                    toolmanmike FABO MODERATOR Staff Member FABO Gold Member

                                    Messages:
                                    53,019
                                    Likes Received:
                                    38531
                                    Joined:
                                    Jan 18, 2006
                                    Location:
                                    Iowa
                                    Local Time:
                                    10:37 PM
                                    I would agree with that. I didn't know about the low vacuum signal problems with the AFB/AVS carbs but it makes sense.
                                     
                                  • Johnny Dart

                                    Johnny Dart Well-Known Member

                                    Messages:
                                    7,960
                                    Likes Received:
                                    2519
                                    Joined:
                                    Nov 30, 2006
                                    Location:
                                    So Cal
                                    Local Time:
                                    8:37 PM
                                    I'm sure the Chrysler engineers didn't have a clue.

                                    street-hemi.jpg
                                     
                                    • Agree Agree x 2
                                    • PRH

                                      PRH Well-Known Member

                                      Messages:
                                      2,607
                                      Likes Received:
                                      3955
                                      Joined:
                                      Dec 14, 2018
                                      Location:
                                      So. Burlington, Vt
                                      Local Time:
                                      11:37 PM
                                      They loved them so much they put Holleys on the SS Darts and Barracudas.

                                      You know...... the racier ones.
                                       
                                      • Thanks! Thanks! x 1
                                      • Agree Agree x 1
                                      • RustyRatRod

                                        RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

                                        Messages:
                                        64,696
                                        Likes Received:
                                        37646
                                        Joined:
                                        Jun 7, 2010
                                        Location:
                                        Georgia
                                        Local Time:
                                        11:37 PM
                                        I'm not arguing. I like the Carter/Edelbrock carburetors. Instead of being vague, why don't you enlighten all of the ignorant? We're all waiting with baited breath.
                                         
                                      • RustyRatRod

                                        RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

                                        Messages:
                                        64,696
                                        Likes Received:
                                        37646
                                        Joined:
                                        Jun 7, 2010
                                        Location:
                                        Georgia
                                        Local Time:
                                        11:37 PM
                                        I agree. In fact, I said as much.
                                         
                                      • Johnny Dart

                                        Johnny Dart Well-Known Member

                                        Messages:
                                        7,960
                                        Likes Received:
                                        2519
                                        Joined:
                                        Nov 30, 2006
                                        Location:
                                        So Cal
                                        Local Time:
                                        8:37 PM
                                        Everybody falls and hits the head on occasion.
                                         
                                      • 66fs

                                        66fs FABO Gold Member FABO Gold Member

                                        Messages:
                                        5,014
                                        Likes Received:
                                        1666
                                        Joined:
                                        Sep 9, 2009
                                        Location:
                                        Greenwood, South Carolina
                                        Local Time:
                                        11:37 PM
                                        Ed Hamburger said a TQ was up to .2 faster than a Holley on an automatic car. He recommended a Holley for 4 speed cars . Both were prepped, but what did he know? For a race car use whatever works for you, you don't have to deal with it every day.
                                         
                                      1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                                        By continuing to use this site, you are consenting to our use of cookies.