Re: Distributor Coils

Posted by jdemaris on February 01, 2005 at 06:02:49 from (209.23.29.29):

In Reply to: Re: Distributer Coils posted by buickanddeere on January 31, 2005 at 23:21:39:

That's my point, it does vary. Since the guy is looking for a way to identify unmarked coils, I assert there is no absolute primary resistance value using Peter Ohm's law that will identify what the coil was intended for. When these coils first began to be used, instead of vibrator coils, i.e. "high tension a.k.a. jump spark ignition" along with "synchronous ignition", many only had an output of 8,000 - 10,000 volts. Voltage requirements increased along with compression ratios. And, even some early coils intended for 6 volt systems had internal primary resistors which compounds the issue. Secondary values vary widely also. You can find two old, unidentified coils, they can both give similar resistance readings, but one might be rugged enough to endure full-time 12 volt use, whereas the other might not. And, some are polarity sensitive, and some are not. I find it frustrating at times since I've got hundreds of them laying around - and with many -have no idea what they were originally used on.

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