Richard Cope Posted June 18, 2018 Report Posted June 18, 2018 Hi, Have a 39 Ply. stock 201 engine with a carter carburetor D6A21. Does anyone have any thoughts if a Sisson Automatic choke can be used? If so, would it replace the manual choke completely or can it possibly be used along with? If so, appreciate a photograph of the set-up. Thank you in advance for your help Regards, Richard Quote
desoto1939 Posted June 18, 2018 Report Posted June 18, 2018 The sisson automatic choke was an option for plymouth. The Dodge, Chrylse and Desoto had two studs on the top of t eintak manifold inwhich the unit bolted directly to the manifold. The 39 Plymouth could be adapted with a special braket and the sisson choke then attached to the braket. I am the person that did the presentation and the power point on the sission choke at the AACa annual lecture in Philadelphia. Fell free to contact me. I live near Philadelphia PA Valley forge Pa Rich Hartung desoto1939@aol.com cell 484-431-8157 Quote
pflaming Posted June 19, 2018 Report Posted June 19, 2018 I have two of these, not using either one. Just how effective is the device? Was it more for marketing purposes than for an improvement for cold weather starting? Quote
Plymouthy Adams Posted June 19, 2018 Report Posted June 19, 2018 it was a step forward in non-human intervention in controlling the fuel mixture when starting a cold engine...no pulling/pushing choke to various stages during warm up or excess consumption of fuel for those that forgot to push that knob to put the choke vertical from those last few degrees Quote
Dodgeb4ya Posted June 19, 2018 Report Posted June 19, 2018 4 hours ago, desoto1939 said: The sisson automatic choke was an option for plymouth. The Dodge, Chrylse and Desoto had two studs on the top of t eintak manifold inwhich the unit bolted directly to the manifold. The 39 Plymouth could be adapted with a special braket and the sisson choke then attached to the braket. I am the person that did the presentation and the power point on the sission choke at the AACa annual lecture in Philadelphia. Fell free to contact me. I live near Philadelphia PA Valley forge Pa Rich Hartung desoto1939@aol.com cell 484-431-8157 The choke unit is bolted to the exhaust manifold with two studs. 1 1 Quote
Plymouthy Adams Posted June 19, 2018 Report Posted June 19, 2018 29 minutes ago, pflaming said: Yes, but did it work? it was used on many models for many years and the industry did not revert back to the manual choke......what would you think the answer may be...? Quote
pflaming Posted June 19, 2018 Report Posted June 19, 2018 I wasn't aware of the long time use of this devise. . So when was the choke " button " eliminated? My apologies for my lack of knowledge. Quote
Richard Cope Posted June 19, 2018 Author Report Posted June 19, 2018 Quote Appreciate everyone's comments and literature. Not sure if there is much to be gained by installing? Rich Quote Quote
Dan Hiebert Posted June 19, 2018 Report Posted June 19, 2018 If your car's choke is what was factory installed, I'd leave it as is. Only benefit would be not having to monkey with the choke to start and run the car. I took the Sisson choke out of our D24 because it wasn't working right, not because I had to have a manual one, and replaced it with a generic manual one a long time ago. Never bothered to put a good Sisson choke back in, but I'm happy with the manual one. Quote
Richard Cope Posted June 19, 2018 Author Report Posted June 19, 2018 Thank everyone for your feedback. My thought was to make the car more reliable, however the automatic choke isn't what I had imagined. Believe I will stay with the manual choke and make sure that it is closed after warming up.. Regards, Richard Quote
Reg Evans Posted June 19, 2018 Report Posted June 19, 2018 Actually you want to make sure that the choke is fully open after warm up. Quote
DJ194950 Posted June 19, 2018 Report Posted June 19, 2018 I like the Sisson choke setups. ? When exhaust manifold is cold the choke (when properly adjusted) will close the choke butterfly to about 70% closed. When the stater is turned on a wire from the starter Will cause the choke butterfly to go to about 100% closed but only when cranking the motor. As soon as the starter disengages the choke will go back to about 70% then less and less as the exhaust manifold heats up. Before using the starter you need to open the throttle slightly for the choke to close and also raise the idle speed. As motor warms up it also requires a tap on the throttle to allow the idle speed to lower- but only if the car is not driven, just sitting still. If you exhaust manifold has a flat spot on top about 2 1/2" long front to back and about 1-1/2 wide it has a spot for the choke to be mounted- probably will need to drill 1/4" mount holes or if not per desoto 1939 a clamp on type bracket will be needed. If you look a Ebay for sisson chokes be aware the two types were made for of Mopar flat motors- One is to put the choke behind the carb. (early to !948?) and later were they mounted in front of the carb. (1949 -later). the arm that works the choke come out of opposite sides. All up to you, wiring is easy, rod to carb. not so much unless you buy a carb. made to work with the Sisson. But it Can be done with some engineering! ? DJ Quote
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