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| quick choke https://slantsix.org/forum/viewtopic.php?t=34567 |
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| Author: | daughters/scamp [ Sat Mar 28, 2009 3:27 pm ] |
| Post subject: | quick choke |
hey all, i just rebuilt the 1945 carb. on my little girls scamp and all went well, there is no more hesitation due to week accelerator pump shot. the vacume is rock steady @ 20 inches. the only issue i have now is that the choke pulls of very quickly. the engine has trouble pulling off when cold. i was wondering is there any way to slow down the mechanical choke, the type that is recessed in to the exaust ? it is complettly open with in two minutes. other than that, the car runs great. thanks jd |
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| Author: | Aggressive Ted [ Sat Mar 28, 2009 4:22 pm ] |
| Post subject: | |
Yes, there is a pivot that is inside the choke housing that you can rotate with a screw driver. You may need to spray some Kriol on the shaft first to loosen it up. It will add more spring pressure or reduce it depending on how much you turn it. A half a turn may do it. It did on mine. Just pull the bolt and un-clip the push rod on the carb and pull the wire to remove and adjust it on your work bench. |
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| Author: | SlantSixDan [ Sat Mar 28, 2009 4:24 pm ] |
| Post subject: | |
The '73-up choke thermostats aren't adjustable. Sounds like your choke heater modulator is dead. Unhandcuff yourself from the Rube Goldberg factory setup and install one of the fully-adjustable Electric choke kits. #1234 is the one you need. |
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| Author: | daughters/scamp [ Sat Mar 28, 2009 6:50 pm ] |
| Post subject: | |
thanks for the replies. i will look inside of the cover in the morning. if it is adjustable i will adjust it. if not i will not and posabbly get an electric. thanks jd |
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| Author: | 1967 Dart [ Sun Mar 29, 2009 1:41 am ] |
| Post subject: | |
If the choke is old and rusty, the spring has probably weakened and not working properly. Adjusting may help for a while, but as said new units are available. I think two minutes would not be fast closing time for newer electric chokes. Maybe Slant is just so huge mass of steel, it takes little longer to heat up than newer aluminum engines. Ted, thanks for information. I have noticed the the pivot inside the choke, but it was so rusty I didn't guess it can be turned. I tried to fine-tune the old choke by bending the spring and rod until I bought the new one. |
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| Author: | Aggressive Ted [ Sun Mar 29, 2009 9:18 am ] |
| Post subject: | |
1967 Dart, I have found that all the rust inside the housing and spring can be cleaned up and the shaft can be loosened up with a little Kriol. I have adjusted chokes from 1963 up through 1976 in this way. Obviously the electric choke is allot nicer, but if you are in a pinch give it a try. Mine is set for about 4 minutes and progressively lowers the idle. On my 74 Dart idling in the driveway it will automatically drop down to 600 rpm with out touching a thing. I count on it every day. It's nice to know that this old style design can still work after 30 years. |
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| Author: | daughters/scamp [ Sun Mar 29, 2009 4:47 pm ] |
| Post subject: | |
well i took the choke off this morning and i was very rusty but it seems to move freely. the only thing i saw that might be any adjustment was in the center of the spring. it is slotted and is were the spring is attached to. there is also a electric assist that is fed power from a resistor close by. i unhooked the power but the choke still pulled of really quickly. can the center attaching point ( slotted screw thing ) be turned to ajust the pull off time? thanks jd |
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| Author: | Aggressive Ted [ Sun Mar 29, 2009 8:52 pm ] |
| Post subject: | |
Yes, you can adjust it for more tension or less. Try about a half a turn at a time. Then see how it does the following morning. |
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| Author: | Eric W [ Mon Mar 30, 2009 12:15 am ] |
| Post subject: | |
Sounds like you need to adjust the vacuum pod that connects to the choke valve over the air horn. It is a rod that is connected to the valve and the vacuum pod on the driver side of the carb. There should be a U shaped bend in this rod...open up the U to extend the rod. Do it in very small incriments...it dosn't take much. If the rod is to short, the vacuum will overpower the tension of the thermostat spring, causing the choke valve to be open to far. |
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| Author: | Aggressive Ted [ Mon Mar 30, 2009 11:21 am ] |
| Post subject: | |
Good point! Agreed both adjustments go hand in hand. If the vacuum pull off loop is not wide enough, it will come off the choke way too early. You can fine tune the timing by the width of the loop. |
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