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 - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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