Re: sourcing new starter

Posted by HH56 On 2010/5/13 8:54:25

One of the web sites mentioned explains the reason why the plug is more efficient when spark comes from center electrode. It runs hotter than shell and since electrons flow more easily from a heated surface, it takes less effort for the spark to start.

Ign coil is an autotransformer and you have a point in that the number of coils won't change so the induced voltage wouldn't either.

My thinking was with the ground being at the bottom with the primary coils included in circuit, there would be x number of total windings but if the connections were reversed, and ground was effectively at the end of secondary winding then it would be secondary windings primarily developing the overall number with minimal input from the primary so voltage would be slightly lower.

Admittedly, my transformer theory is rusty and this application is different since you are relying on the magnetic core with the collapsing field rather than a constant excitation. Still, even though you do have the same number of windings with the primary becoming part of secondary, am just not understanding how much it will contribute since you are effectively referencing the voltage in question between a tap point and output. I don't see a clear path for the primary windings to be included unless there is feedback thru something else or ringing involved.