Tham Posted February 11, 2010 Report Share Posted February 11, 2010 I've noted that since I switched over to an electronic ignition system on my KE70's 4K, the engine runs much hotter than usual, presumably due to a higher coil output voltage and hotter spark. I had bought the distributor module with built-in ignitor, plus a resistorless coil, from a salvage yard some time ago. I think it was a stock unit on the 5K engine or the Starlet's 4K-E. The coil does not use any external ballast resistor. I wonder if adding back a ballast resistor in series to the coil's positive terminal, as with a normal external resistor-type coil, might reduce the secondary output voltage, a somewhat weaker spark, and thus help the engine to run cooler. Quote Link to comment Share on other sites More sharing options...
Taz_Rx Posted February 11, 2010 Report Share Posted February 11, 2010 Nope. That coil is designed to run no ballast resistor, adding one will potentially stuff your coil. Quote Link to comment Share on other sites More sharing options...
SLO-030 Posted February 12, 2010 Report Share Posted February 12, 2010 I've noted that since I switched over to an electronic ignition systemon my KE70's 4K, the engine runs much hotter than usual, presumably due to a higher coil output voltage and hotter spark. I had bought the distributor module with built-in ignitor, plus a resistorless coil, from a salvage yard some time ago. I think it was a stock unit on the 5K engine or the Starlet's 4K-E. The coil does not use any external ballast resistor. I wonder if adding back a ballast resistor in series to the coil's positive terminal, as with a normal external resistor-type coil, might reduce the secondary output voltage, a somewhat weaker spark, and thus help the engine to run cooler. If you want a weaker spark, why bother swapping to electric dizzy? I'd say the temp issue would be more to do with timing than anything else. Considering you changed dizzy, its possible the timing is out. Quote Link to comment Share on other sites More sharing options...
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