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To: _Jim; unlearner
automotive (spark) ignition systems (even though the secondaries of the coild are *not* strictly tuned, they do 'ring' owing to the stray interwire capacitance that exists in any physcial coil).

Yep. Although I don't work on the automotive side (I do marine ignitions), the principles are the same. About the only thing we watch for besides turns ratio (and making sure the wire insulation has a high enough dielectric) as far as the secondary is the inductance, because too high of an inductance serves as a rev limit due to saturation at high RPM.

What's real fun is to hook a marine ignition (cap ripper @ 250-300VDC output) to an automotive coil (rated with a 12VDC primary, and thus a higher turns ratio). The coil don't last long when you do that, but it is fun to see foot-long sparks!

102 posted on 01/26/2005 12:00:52 PM PST by adx (Why's it called "tourist season" if you ain't allowed to shoot 'em?)
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To: adx
What's real fun is to hook a marine ignition (cap ripper @ 250-300VDC output) to an automotive coil
I used to have a "CD" (Capacitive Discharge ignition kit as built by Delta and Heathkit years ago) on my old Plymouth; one learns of the 'hotter spark' put out by those configurations when pulling the spark plug wire at the plug (as opposed to the distributor) while looking for a 'dead' cyclinder ...
103 posted on 01/26/2005 12:24:12 PM PST by _Jim (<--- Ann C. and Rush L. speak on gutless Liberals (RealAudio files))
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