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Re: 9N resistor
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Posted by John T on March 22, 2006 at 18:12:13 from (66.244.90.98):
In Reply to: 9N resistor posted by rrs26ja on March 22, 2006 at 16:20:05:
rr, If the coil is drawing excess current and overheating it can indeed eventually fail, but I dont see the elec ignition module as the fault. If the old coil happened to have been labeled something like "12 volts for use with an external ballast resistor" its really a 6 volt coil and requires the additional series ballast, but if it were a true full 12 volt coil labeled 12 volts or 12 volts NO external ballast, it should have been fine on 12 volts REGARDLESS if points or an elec switch were used. That new coil that measures 2.5 ohms is close to what a standard 12 volt coil would be as they are often in the 2.5 to 3.5 ohms range. I would try it first unballasted and see how warm it gets but if it gets so hot you cant hold your hand on it, thats too much current and it needs ballast. If you overballast then the coils not gonna draw as much current as it was designed for and the spark will be weaker taking away the benefits that elec ignition has to offer. When one uses an elec. switch I recommend it be coupled with a high energy performance coil to get the most bang for the buck that elec igniiton has to offer. I believe Id try that new coil unballasted first n see if it overheats and if so THEN add some ballast between .5 and 1 ohm. John T
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