Because the spikes happen on the negative side of the coil not the positive side of the unilite. The 29219 coil has 14 ohms primary 10k secondary and puts out 58k volts.
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Have since seen other standard replacement resistors for around half the price.
Mallory resistor. Fitted this along with the mallory e spark ignition kit as the original resistor was junk. Mallory ballast resistor sort by. Have had no problems with the ignition system since fitting 6 months ago.
Mallory says the 29216 has700 ohms primary secondary 89k ohms and puts out 51k volts. True most relevant false price low to high false price high to low false brand a z false brand z a most popular false specials false newest. The ballast resistor was installed on a 429 mercury engine and voltage readings were taken.
Mallory is not to be trusted as 80 of their product comes from china. This resistor is a variable resistor type and the voltage varies as the engine or coil heats up. Resistor has no effect on the performance of the ignition system.
One thing that confuses a lot of guys the unilite itself doesnt need a resistor it can run on 12 14 volts per mallory however the coil needs to run a resistor on the positive side why. Variable resistance values improve cold starting while preventing excessive coil current that can damage ignition parts. This item appears to be a high quality item.
Have since seen other standard replacement resistors for around half the price of the mallory 700 which i believe would work just as well with the e spark and my otherwise stock engine which is the only reason i gave it 4 instead of 5 stars. We recommend you measure you coils impedance and if its below 15 ohms you need. Mallory 6a 6al and msdtm 6 series ignition part no.
Have had no problems with the ignition system since fitting 6 months ago. Mallory ballast resistor 15 ohms 700 is a heavy duty porcelain resistor with threaded terminal connectors rated at 200w. Im using the mallory supplied ballast but dont know the specs have to assume its 7 ohms or they wouldnt have sold it to me hah.
However installing or retaining the original ignition ballast resistor allows for easy conversion back to standard ignition. Fitted this along with the mallory e spark ignition kit as the original resistor was junk. Performance readings were as expected.
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