Re: Coils

[Dodger7998@xxxxxxx]

In a message dated 3/16/2004 5:59:59 PM Central Standard Time, 
jsbs@xxxxxxxxxxxxx writes:

> Isn't the ballast resistor what saves the ECU and coil from burn-out? 
> >The coil will only get a true 12 volts power when cranking, and for a
> >short time after the engine starts.  Current flow causes the ballast to
> >heat up, then reduce voltage to the coil. The extended dwell, related to
> >the electronic switching, is where the coil builds up it's power. Is 
> >this
> >right or wrong?  Tom

Tom  the anwser is yes and no;             line voltage(12.6)is applied to 
the coil while the ignition switch is in the start position, as soon as the key 
is returned to the run position the voltage is reduced by the current flowing 
thru the ballast resistor (.5-.6 ohm), it was always my understanding that the 
wilre wound resistor mounted in the ceramic holder was for the extraction of 
heat from the resistor to keep it from burning up .  My concern was that some 
of the aftermarket high output coils do not operate off of a  reduced voltage, 
which would mean that the ECU would be required to handle a heavier load than 
it was designed for, I know that it can handle it for shorter periods of time 
as I have been know to jumper out the ballast resistor on a flooded or mi
ssing engine to clean up the fouled plugs, as the hotter spark has a tendancy to 
make them fire again, as well as an old mopar racing tip was to parraell two 
resistors as to raise the voltage to the coil, but it also said not to do it for 
prolonged periods of time as it would cause the ignition system to overheat 
and cause damage.
                                                                              
       dodger

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