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Re: Re: Re: Re: Re: Re: Re: Spark Plugs 6 V verses 12V
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Posted by Bob M on January 18, 2002 at 10:22:06 from (165.170.128.66):
In Reply to: Re: Re: Re: Re: Re: Re: Spark Plugs 6 V verses 12V posted by Bob/Maine on January 18, 2002 at 08:43:56:
Bob - Plugs see the same voltage and current regardless of the coil primary voltage. So while a 6 volt coil draws twice the primary current of a 12 V, the output current/voltage of both coils is the same. Hence plug life is independent of coil voltage. Regarding advantages of 12 V has over 6 V is 12 V, the only advantage 12 V has is it lets you use a 6 volt coil with a ballast resistor. Then by arranging the starter switch so it bypasses the resistor while the engine is cranking, you develop an extra hot spark, just when it's needed most (since you are now feeding the 6 V coil 9 or 10 volts during the cranking cycle). This offers no advantage to a low compression tractor motor. However the ballast resistor setup was necessary to insure reliable starting of the high compression automobiles of the late 50's/early 60's. These motors required a lot of battery power to crank, and also needed an extra hot spark to fire the highly compressed fuel/air mixture.
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