Thanks Peter
It looks similar to the spark tests I did a while ago when I used the output from a neon sign transformer across the spark plug electrodes and then compared the spark with a HV cap attached in parallel of the gap. With the cap the sparks were much brighter and louder. Unfortunately at that time I did not try spraying water on those sparks. Here is that video:
YouTube - spark plug/capacitor test
Will test this out some more tomorrow
Also, I forgot to mention that when I used the cap circuit with the long spark, I made numerous discharges and at the last spark my rectifier fried. It might be that the HV arced between the relay contacts and hit the rectifier. So aditional protection would be advisable
Another thing, the big spark does not appear if your spark gap electrodes are dry, you have to spray some water on them, otherwise there will be no long arc
Thanks,
Jetijs

It looks similar to the spark tests I did a while ago when I used the output from a neon sign transformer across the spark plug electrodes and then compared the spark with a HV cap attached in parallel of the gap. With the cap the sparks were much brighter and louder. Unfortunately at that time I did not try spraying water on those sparks. Here is that video:
YouTube - spark plug/capacitor test
Will test this out some more tomorrow

Also, I forgot to mention that when I used the cap circuit with the long spark, I made numerous discharges and at the last spark my rectifier fried. It might be that the HV arced between the relay contacts and hit the rectifier. So aditional protection would be advisable

Another thing, the big spark does not appear if your spark gap electrodes are dry, you have to spray some water on them, otherwise there will be no long arc

Thanks,
Jetijs
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