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Old 09-25-2021, 10:30 AM   #4
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Join Date: Jul 2014
Location: Iowa
Posts: 1,570
Default Re: When does the plug fire?

The plugs fire when the distributor points open and the rotor is pointing to one of the terminals inside the cap. The amount of time required to charge the coils is called the "dwell". When the points open, the collapse of the field in the coil results in a high voltage surge which fires the plug(s). When setting the dwell, the use of a machine will get a maximum result
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