Re: coils

Posted by Bob on December 17, 2006 at 20:07:11 from (69.178.229.154):

In Reply to: coils posted by bm3501466 on December 17, 2006 at 19:33:52:

Most conventional ignition systems with breaker points can only handle a primary ignition current with the points closed of 3 to 4 Amps.

Assuming this is a "12-Volt" system, the battery is at about 12.5 Volts with the engine NOT running, the coil MUST have a primary resistance of AT LEAST 3 or slightly more Ohms, or the excessive primary current will overheat the coil, and tend to overheat and burn the points.

A ballast resistor is used along with a coil with a resistance of less than 3 Ohms to make the total primary circuit resistance sufficient to limit current to a safe level.

If using an electronic igntion system, follow the MANUFACTURER'S recommendation for coil resistance. Same will work with coils with as little as .5 Ohms resistance, others need 2.5 or even 3 Ohm coils to avoid "toasting" the module.

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