Re: 12 volt coil without resistor

Posted by Bob on January 14, 2006 at 18:47:08 from (64.21.249.40):

In Reply to: Re: 12 volt coil without resistor posted by KEB on January 14, 2006 at 18:04:08:

KEB,

Thanks for posting that!

You are absolutely correct. I have posted that info so often here, and it doesn't seem like anyone evers sees the correct information, or remembers it.

There is more to a Kettering ignition system than many people realize. The coil and condensor form a resonant circuit, and the coil "rings" at each spark event. The better the "Q" of the primary circuit, the better the coil "rings" and the "hotter" the spark. You DON'T want the resistor between the coil and the points/condensor to add resistance OR inductance there.

Anyone who has ever viewed the operation of an ignition system on a 'scope is familiar with this.

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