jimmy101 wrote:Flames don't like to propagate through gaps. Too much surface area for the volume, resulting in too much heat loss. As I said, even the very small upper electrode of a spark plug gives a noticable shadow in the flame front. A gap is going to be much worse.
Since the rod is buried in the PVC, not cemented on top of the strip, I see no reason to think that the odds are much better the flame will equally choose to propagate through the bottom side as well as the top side.
I'm actually giving the whole spark strip concept more thought and may present something here in a few days.