Skint wrote on 01. Sep 2011 at 17:55:
Marks DTM Calib wrote on 01. Sep 2011 at 13:11:
Question is, how are you testing them as to do it correctly you need a large gap test plug to simulate the required 30-40mm gap.
If you work on a small gap you get no indication as to if the coil is ok and can also apply to low a load to it which may damage it.
Does the same apply to my issue on an X20XEV? I tried checking the sparks with a spark plug in the end of a HT lead and a jump lead from there to the battery negative.
Yes it applies to all and the test done is not a great test sadly.
Basics are that under compression, you need mega volts to create a spark in the cylidner, at atmpsheric pressure, to simulate this you need a big gap.
You could break down a 1mm spark gap with only 1KV at atmosperic pressures.
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