Author Topic: Chainsaw ignition timing  (Read 6863 times)

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Offline Al Smith

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Re: Chainsaw ignition timing
« Reply #10 on: October 17, 2016, 05:38:29 am »
--now then .Coil voltage is dependent on three things,rotational speed,lines of magnet flux cut and air gap of the coil to fly wheel ,faster means more,closer means more ,position the coil fires at in relationship to the magnets.

If the coil fires on the leading or trail edge of the magnets the voltage will be less,dead center magnetically will be the highest .

The reason you need advance is to "light the fire" so the max rate of expansion occurs at slightly past top dead center .It could be almost top dead center on a slow running engine like a john Deere ,or say 35 degrees on a two cycle running say 17-18000 RPM .It's not that the piston speed is out running the spark it's you can't get the expansion to get going on the fuel .

 

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