Teach me about ohms and coils Options

[jsayre914]

I am currently running a stock distributor on my 2.0 w/ Djet. It has the pertronix ignitor module made for my distributor with the vacume advance. I also had a flame thrower 3ohm coil made by pertronix. I am not sure how many ohms a stock bosch coil is, but my question is...

most high performance coils such as mallory, crane, even the flamethrower (not the one I have) comes with a resistance of .06 or less. Why is this, and what does the ohms do for you anyway. I am thinking to put one of the VERY low ohm coils on my engine to see if any better performance.

If you dont mind also explaining why i threw out my ballast resistor when I originally put the pertronix in. (as per installation instructions) what the heck did that do for a stock coil thats not needed for a 3 ohm coil?



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[toolguy]

measure from the + to the - for the primary winding. . this is wound with large wires with relatively little windings and the reading will be around 1 ohm, which for all practical purposes is a dead short. .
to measure the secondary windings go from the spark plug lead to the - terminal .. this is a lot of windings and a relative small guage wire so this will have a greater resistance than the primary

looking at the diagram, it is possible to measure from the spark lead to the positive lead but you will then be measuring through both sets of windings

Back to your original question, why does the performance coil have a lower primary coil resistance. . because it is probably wound with larger gauge [ think diameter] wires. . the larger the wire with less resistance + more current flow which in turn make for a coil with a bigger secondary winding thus a bigger charge and thus a bigger spark, but it sucks more current and the coil runs hotter. . it's all relative. .