question for the carburetor gurus

Fuel and Air Systems

  1. Ray70Chrg

    Ray70Chrg Well-Known Member

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    When setting up an electric choke, what ambient temp. would you expect the choke valve to be completely closed and what engine temp. would you like to see the fast idle cam come off the adjustment screw? Thanks
     
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    • 451Mopar

      451Mopar Well-Known Member

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      I always used trial and error?
      Usually at 60-70 degrees Fahrenheit the choke would be slightly open with cold engine.
      Colder, it would be closed, but the choke pull-off should crack it open a bit, once the engine starts.
      Full open was whatever? The electric choke heater would get it open in short time?
       
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      • Cranky

        Cranky Henchman #1 Staff Member FBBO Gold Member

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        I like the choke to come off as soon as possible. Just have to experiment with it to see what works best for you but then.....a manual choke works for me.
         
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        • 33 IMP

          33 IMP FBBO Gold Member FBBO Gold Member

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          Who uses a choke in arizona?
           
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          • Cranky

            Cranky Henchman #1 Staff Member FBBO Gold Member

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            Even here in SE Texas, there's a need from time to time lol
             
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            • Ray70Chrg

              Ray70Chrg Well-Known Member

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              We do get night temps in the mid 40s, some mid 30s, and once in a while the high 20s and the daytime temps can be 65-70. Should I be setting the choke valve to completely closed for 45* start or do you think it should be partial open?
               
            • Cranky

              Cranky Henchman #1 Staff Member FBBO Gold Member

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              Like I mentioned earlier....experimentation works.
               
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              • Cranky

                Cranky Henchman #1 Staff Member FBBO Gold Member

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                Closed all the way on cold days but needs to open a bit once it starts. If it stays closed after startup, it'll be too rich....it needs to open a bit after it starts up. Just need to watch it and see what it does and keep your head out of backfiring path in case it does that.
                 
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                • WileERobby

                  WileERobby Well-Known Member

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                  What he said. It's not an "exact" science, it what works well in the environment that it's in. We used to get cars in the garage that worked perfectly in summer, not in winter. And vice-versa. Many times it was a compromise.
                   
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                  • Ray70Chrg

                    Ray70Chrg Well-Known Member

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                    Yeah, I only have this problem when it's cold here at night. I think my problem is I have set the choke valve too closed for 40 degree mornings and need to find the proper amount of opening that will work at that temp. In other words, I am choking off too much air that is needed for a good start. Thanks to all
                     
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                    • 65-440

                      65-440 Well-Known Member

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                      Unfortunately engine temp has no direct affect on electric choke operation. Once voltage hits the spring it starts heating up and opening the butterfly. I just set mine for the desired cold start rpm and when it's done it's done.....
                       
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                      • Ray70Chrg

                        Ray70Chrg Well-Known Member

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                        Thanks, I was asking that question as a correlation to the engine temp. when the electric choke heats up enough to release the fast idle cam, not that the engine heat controls that function.
                         
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                        • Cranky

                          Cranky Henchman #1 Staff Member FBBO Gold Member

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                          Been awhile since messing with carbs with electric heat chokes but iirc, you can still adjust them to not open as much/fast depending on ambient air temps.....
                           
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                          • Ray70Chrg

                            Ray70Chrg Well-Known Member

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                            Thanks Cranky, I'm experimenting with that now thanks to the suggestions from several posts above. Winter in phoenix area of arizona is much different (milder) than most other states. Cold here is not the same as real cold. I just have to find that happy medium.
                             
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                            • 66 Sat

                              66 Sat Well-Known Member

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                              Mine is wired open. Never need it here, even in winter when the coldest nights are 40°.
                              I just pump the throttle a few times before starting and then just nurse the engine a little for maybe the first mile or so, popping it into neutral at stoplights.
                               
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                              • Ray70Chrg

                                Ray70Chrg Well-Known Member

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                                I'll bet it's Saturday where you are. I feel like I just got a message from the future. It's friday here, for the next 3 hours anyway. Thanks
                                 
                              • Dave6T4

                                Dave6T4 Well-Known Member

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                                I am up here in Ontario where it runs 70-85 degrees on average summer days. Fall and spring is 50-70 degrees. I have electric chokes on my Edelbrocks and start out by setting them one notch rich. You can experiment leaner or richer from there, as your car likes it.
                                 
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                                • 66 Sat

                                  66 Sat Well-Known Member

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                                  Haha yeah it's Saturday afternoon, hot and sunny.
                                  Nothing exciting has happened in the near future so you can sleep tight.
                                   
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                                  • Ray70Chrg

                                    Ray70Chrg Well-Known Member

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                                    Just to close this thread out, I adjusted the choke open to this position and engine fired right up on this cold 50 degree morning. The plate cannot get closed any more than this position no matter how cold it gets. Thanks to all for the help. CIMG1541.JPG
                                     
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                                    • Cranky

                                      Cranky Henchman #1 Staff Member FBBO Gold Member

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                                      Does it have a choke pull off? It's usually a small dash pot hooked to a vacuum line and choke blade. You you first set the choke by depressing the pedal, it should close all the way and upon fire up, the dash pot will pull the choke open some. There's usually a linkage rod with a 'U' bend in it that can be adjusted for the amount of pull off you want.
                                       
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