2150 Choke "Flap" Adjust
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2150 Choke "Flap" Adjust
Another (hopefully simple) question on my 2150 carb (2150 carb on a 351M '78 f150 4X4). I've read all the posts I can find and I'm still not sure about this. I want to adjust the choke butterfly (flap). I understand about rotating the housing rich and lean. Question is, if I adjust it this afternoon (engine will be cold as I'm not driving it today) and ambient air temp is mid 80s, do I adjust it so the butterfly is open, slightly closed, or closed? I can see how you'd want it sitting closed when the ambient temp in the morning is cold, but on a normal day in warm temps, don't you want the bi-metallic spring setting at full open? I don't need any choke to start it when it's this warm during the day, only when it's cold in the mornings.
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Joined: Apr 2004
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From: NJ where fun comes to die
Why not set it in the morning when it is cold. Then start it and run until hot and check to see it is wide open. It will open wide because of the heat of the engine, not because it is a warm day. If when you check it, it is not completely open, readjust until it is open.
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Originally Posted by trike1946
Why not set it in the morning when it is cold. Then start it and run until hot and check to see it is wide open. It will open wide because of the heat of the engine, not because it is a warm day. If when you check it, it is not completely open, readjust until it is open.
I guess part of what I'm after here is every MPG I can find. This thing gets awful mileage even with a new carb, so I was looking at leaning the choke as much as possible in an attempt to maximize economy there. However, I've got to have the choke in the morning more than the mileage. All the mpg in the world does me no good if I can't start the
thing. And at 60° with no choke, it does NOT start!I'll re-check my mileage again soon and if it's still bad I'll tweak the mixture screws. I've wanted to try everything else first before I do that since it's running so well (other than mileage) with the new carb.
Stan
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From: MCBH Kaneohe Bay, HI
Ya know that your mixture screws only control the carb's idle circuit. The only way you can change the cruising mixture is to rejet it, since its only a 2 barrel. Smaller jet holes will lean it out and bigger ones will inrichen it, but good luck findin jets for a 2150. But like ya dont want a carb to run too rich, if its runnin too lean it will cause detonation which usually ends up eatin' a hole in your piston tops.
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