Posted by Janicholson on July 09, 2016 at 20:28:58 from (97.112.56.175):
In Reply to: Ignition Coil 12 volt posted by gdtractor on July 09, 2016 at 19:48:30:
The use of a coil with 1.4 ohms will draw more than 8 amps on 12v. (let alone 14.2 running volts) that coil with a ballast resistor will still draw lots of amps. The points in a conventional distributor will burn up quickly either way. The coil can work with a resistor, and electronic ignition. Voltage is a function of a fully saturated coil primary (dwell) and spark gap/wire resistance. The wider the plug gap the higher voltage it takes to jump it. I would use a coil with 3.5 to 4 ohms W/O resistor, and 2.5 ohms with a resistor. If electronic, go with the recommended coil from the supplier. THere are no internal resistors in coils, just enough windings to operate at a specific run voltage. The confusion comes from the words "external resistor required", which implies that some have an internal resistor. they do not. Jim
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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