Carburetor Adjustment

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frenesse
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Carburetor Adjustment

Post by frenesse » Fri Aug 21, 2020 1:48 am

This is an easy one. Just installed a rebuilt Carb. The choke has to be completely open for engine to run. Any suggestions? Oh it is a Holly NH and is on my 24 Coupe. Center drain on bottom.
Ron
Last edited by frenesse on Fri Aug 21, 2020 8:06 am, edited 1 time in total.


Kerry
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Re: Carburetor Adjustment

Post by Kerry » Fri Aug 21, 2020 2:12 am

That's what I find with all my T's, a couple of turns with the choke closed and then the engine fires right up with the choke open, trying to close the choke any while the engine is running only over fuels it and stops.


DHort
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Re: Carburetor Adjustment

Post by DHort » Fri Aug 21, 2020 3:03 am

Running too rich?


Russ T Fender
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Re: Carburetor Adjustment

Post by Russ T Fender » Fri Aug 21, 2020 8:39 am

When cold crank once or twice with choke on. Then turn on switch and crank without choke to start. Some carburetors work best if mixture knob is opened a 1/4 turn initially and then closed once started. When warmed up no choke at all. Everyone is different so you have to experiment until you discover the best method for your car. I have 7 T's and none of them will start with the choke on but each one requires a slightly different procedure for cold starting.

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DanTreace
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Re: Carburetor Adjustment

Post by DanTreace » Fri Aug 21, 2020 8:52 am

frenesse wrote:
Fri Aug 21, 2020 1:48 am
The choke has to be completely open for engine to run. Any suggestions?
Ron
With new rebuild the needle valve and seat are fresh, so make initial setting 3/4 to 1 turn counterclockwise from full closed clockwise on the carb adj. knob. That should work to start, a small amount of choke when cold, like two or three engine revolutions. Once warmed up, carb setting may need tweaking.

Requiring full choke to maintain running means fuel starved, carb setting adj. knob needs to be used.
The best way is always the simplest. The attics of the world are cluttered up with complicated failures. Henry Ford
Don’t find fault, find a remedy; anybody can complain. Henry Ford


Norman Kling
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Re: Carburetor Adjustment

Post by Norman Kling » Fri Aug 21, 2020 10:57 am

Pull the throttle about 1/4 down. Spark all the way up and needle 1 1/4 open. As soon as it starts, pull the spark down about 3/4. You should only need to choke about 3 pulls up or just a short time if using a starter. If it quits soon, try opening, counter clockwise, the needle valve 1/4 turn and try again. If that doesn't help, you have a clog somewhere in the carburetor of fuel system. As soon as the engine starts, and keeps running, adjust the needle to the smoothest spot and push up on the throttle. You might need to retard the spark a bit to keep it idling smoothly. When the engine warms up adjust the idle screw to the slowest point it will continue to idle.
Norm


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frenesse
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Re: Carburetor Adjustment

Post by frenesse » Mon Aug 24, 2020 1:04 pm

Norman
It worked. Thanks for the assist.
Ron

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Mark Gregush
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Re: Carburetor Adjustment

Post by Mark Gregush » Tue Aug 25, 2020 11:25 am

Think of the "choke" as a primer, closed for priming the engine, open for running.
I know the voices aren't real but damn they have some good ideas! :shock:

1921 Huckster
1925 Cut down pickup

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