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Fordson Coil Tuning[Steve Welker]

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Will@ont.ca

03-30-2003 16:37:51




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I,am looking for info on tuning my coils on a 1922 fordson I've been working on.I got it running but it seems to be cutting in and out[some coils].Thanks!! WILL




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steve welker

04-09-2003 17:55:49




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 Re: Fordson Coil Tuning[Steve Welker] in reply to Will@ont.ca, 03-30-2003 16:37:51  
I seen my name attached to this question so I thought I better respond. What follows is from a 1927 copy of Dyke's automobile encyclopedia. A basic rule for properly tuned coil is that it should be able to jump a single hot spark across a 1/4" gap while drawing only between 1.2 and 1.8 amps from a 6 volt battery. By just adjusting the coil until a hot spark is given is not always the best, since the coil may be drawing more amps than the mag is putting out. Using the method Ray posted is not to bad since you use the actual mag current to test the coils, but just jumping a spark plug gap is not good enough. In order for a spark plug to fire under compression, it needs to jusp at least a 1/4" gap in "free" air.
To adjust this amp draw there are two things to adjust. 1st is the nut adjusting the point gap which will change the intensity of the spark thrown. 2nd and most importantly is bending the back of the lower point half, to change the spring pressure. Bending the back down will increase the point spring tension and also the amp draw. Bending the back up decreases the tension and in turn the amp draw. By playing with these two adjustments you try and get the hottest possible spark while drawing in the 1.2-1.8 amp range. With some practice its pretty easy.
Doing this on the tractor is pretty hard, so we made a bench coil tester. My brother made a nice wooden box, with an antique amp gauge, and a fancy adj. spark gap, but a extra coil box with an amp gage wired between the bottom terminal and battery works fine. If you would like a better detailed description of building a tester let me know and I will email you.
Good luck with the coils, if you run into any problems let me know I'll be glad to help. Currently we have eight tractors running on coils, so we learned alot keeping a min. of 32 coils buzzing. -Steve Welker

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RAY

04-01-2003 20:38:38




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 Re: Fordson Coil Tuning[Steve Welker] in reply to Will@ont.ca, 03-30-2003 16:37:51  
The way an oldtimer showed me how to was 1.Remove the sparkplugs but re-attach the leads and earth the outer casing of the spark plug on the engine so you can see spark. 2. Earth the coil you want to adjust(put a wire from the back of the coil box on the wire that leads to the commutator to an earth)you have to swap it to the coil you want to test. 3.Slowly turn the engine over and adjust the coils so that they give the best spark at slowest cranking speed. When I rebuilt my coilbox I used the old copper terminals in the coilbox which caused irregular firing .But a new set and the above mentioned tuning method had it running like clockwork .Also check your points for pitting. Hope this helps you.

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Will@ont.ca

04-02-2003 01:06:51




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 Re: Re: Fordson Coil Tuning[Steve Welker] in reply to RAY, 04-01-2003 20:38:38  
Ray I'll surely give it a go to see how it works for me.My F is a 1922,it runs but seems to be a little rough.I'am not sure if it's the coils or the carb.The carb is a Kingston M-D and it was in rough shape but I cleaned it up and put new needle and seat and new venture in it.I would like to find a new valve ajustment screw at the top but a haven't found one yet. THANKS!!! WILL



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