This youtube engine running at 5000rpm, ignition draws 16 amps /3 mS per spark. At 10000 sparks / minute for a 4 cylinder this equates to a continuous current draw of 8 amps. 12 volts x 8 amps = 96 watts. not counting the additional engine management overhead. Old type points/coil/dizzy, identical engine/revs = 24 watts. Now unpopular CDI units. except for motorbikes = 12 watts. irrespective of rpms. Its no wonder these coil on plug units fail. Bad and inefficient design.
quickbuck,
Oct 10, 11:04am
96 Watts. And people wonder why a not too old battery fails. Of course not helped by the sound sustem that is a little bigger than whireless that used to be an optional extra.
fungles,
Oct 10, 11:16am
Plus the thermal issues of mounting the coil in the worst possible heat, both convection and direct conduction from the spark plug. Add the electrical stress. it just could not be more poorly designed if they tried. Why not use infrared laser diodes to initiate combustion. no high voltage, very little current, and no ridiculously priced spark plug sales. I have a working prototype system on my old Kawasaki 2 stroke. Runs fine.
quickbuck,
Oct 10, 11:18am
Well done on the inovation. Sounds awesome.
mrfxit,
Oct 10, 3:10pm
Cons =
Temperature variations Vibration issues throughout the rev range Very high amp requirements (as above) Expensive to replace Easy to break when removing on some models
Pro's = Spark precision High speed delivery of spark Short duration of spark.
ozz1,
Mar 3, 12:07pm
a good visual check also helps. and some times quicker.
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