hey guys
I think Im having a brain f@rt!
In the DIS waste spark system the coilpack fires both plugs at the same time, one is positive ground and the other is negative groung, then when that coil pack fires again it is reveresed. Can anyone please explain what is meant by that?
one more ?, if electricity flows negative to positive then would the secondary side of the coil be concidered negative and the plug electrode be concidered positive?
thanks in advanve for any thoughts

 

Jester,

If you've ever studied electricity or electronics, you'll remember Lenz's Law regarding inductance. An expanding magnetic field tends to induce a like field (and current) in a parallel winding, and a collapsing magnetic field tends to induce an opposing field (and current) in a parallel winding. For this reason, a common automotive ignition coil actually produces a high NEGATIVE voltage at the coil secondary (high voltage) terminal. The spark current at the plug travels from the center electrode to the ground (side) electrode, since conventional current flow is from negative to positive as you pointed out. This applies whether the system uses breaker point, electronic primary switching (like HEI) or a magneto.