Re: Resistor placement -- Another reason

Posted by Gerald J. on May 07, 2007 at 07:22:29 from (67.0.103.21):

In Reply to: Re: Resistor placement posted by RAB on May 07, 2007 at 02:41:47:

Yes, the series resistor to the coil can be shorted out for better starting. That is not the only reason for the resistor in all engines, it is the important reason in a tractor engine (slow speed).

In a high speed engine the use of a coil with resistor will run better because the L/R ratio of the combination will allow a much faster rise of the coil primary current when the points close so that the dwell time can be shorter and still have good ignition power. The output ignition power depends on the peak current just before the points open. The inductance of the coil primary causes that current to rise relatively slowly, but using twice the voltage with a resistor will allow that current to rise considerably faster and so allow the engine to run considerably faster. This probably has no detectable effect below 6,000 or 8000 RPM on an 8 cylinder engine, but for high speed engines the resistor is very important.

Gerald J.

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