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Re: Re: Re: Re: Re: Spark Plugs 6 V verses 12V
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Posted by Bob M on January 18, 2002 at 06:57:06 from (165.170.128.66):
In Reply to: Re: Re: Re: Re: Spark Plugs 6 V verses 12V posted by Bob/Maine on January 18, 2002 at 04:58:43:
Hi Bob - Output voltage of an ignition coil is a function of the coil turns ratio, the amps flowing in the primary at the instant BEFORE the points open, and upon the rate of collapse of the primary current the instant AFTER the points open (dI/dT for you EE's...). Consequently the open circuit voltage of any coil (6 or 12 volt) will be somewhere between about 15 and 35 kv or so. Electronic or HEI systems will run higher - up to 50 kv. However the maximum voltage actually generated by the coil and "seen" by the spark plugs is a function only of the electrode gap distance and of the nature (pressure, temperature and composition) of the gases in the gap. This is because once the gases in the gap ionize and the spark begins, the spark path is essentially short circuit across the electrode gap - very little resistance, hence a very small voltage drop. Bottom line: Doesn't matter if your electrical system is 6, 12, 24 or 28, or even 0 volts (magneto) - the spark plugs won't know the difference. You use the same plug, and expect to see the same performance and plug life regardless of system voltage!
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