question for the carburetor gurus

Ray70Chrg

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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
 

451Mopar

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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?
 

Cranky

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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.
 

Ray70Chrg

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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.
Who uses a choke in arizona?
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

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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?
Like I mentioned earlier....experimentation works.
 

Cranky

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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.
 

WileERobby

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Like I mentioned earlier....experimentation works.
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.
 

Ray70Chrg

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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.
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
 

65-440

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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.....
 

Ray70Chrg

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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.....
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.
 

Cranky

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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.
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.....
 

Ray70Chrg

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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.....
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.
 

66 Sat

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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.
 

Ray70Chrg

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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.
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

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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.
 

66 Sat

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

Ray70Chrg

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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
 

Cranky

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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. View attachment 1224343
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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