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Racing sparks vs. primary design



Original poster: Steve Conner <steve@xxxxxxxxxxxx>

Hi all

The discussion between John Freau and Jim Mora got me thinking.

I have been wondering for a while whether the voltage profile on the secondary is determined by the shape of the primary. I think a little solenoid primary that hugs the bottom of the secondary will induce most voltage in the bottom of the secondary. Because of its small size, the field is very intense near to the primary coil and dies away quickly with distance, so it will roast the bottom of the secondary while hardly touching the top.

Hence I expect it will give racing sparks sooner than a large diameter solenoid, cone, or pancake that "throws" the field further up and spreads it more evenly over the secondary. Even if both primaries had the same overall coupling coefficient.

Does anyone have any thoughts on this?

Steve Conner