Quote:
Originally posted by ZOANAS
The sparks occur at two different times, before and after the normal timing mark. This has the effect of a longer spark in the cylinder, which increases power and burns the mixture more efficiently (and, I would imagine, hotter). Racers use this setup often.
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Nope. I don't know what happends with OEM 964 dual plug setup (but i woulöd be really surprized if they had different timings for plugs) but all wastespark coils are triggered with one lead and will fire both plugs simultaniously. As far as i can see it's the only optimal way. Trick with dual plugs is to initiate flame front from "both sides" so it burns faster. That way you don't need as much power-sapping advance on ignition. Firing two symetrically positioned plugs in same cylinder at different times would do little good as it will prolong flame-front burning.
Actually, wastespark coils aren't really wasting any spark when used on twin plug heads beacuse both sparks are going into same head, as they should. On the other hand, using wastespark coils on twin-plugged heads and ECU that is actually made for wastespark
will actually waste sparks...effectivly firing four plugs at once...
Getting complicated? :-)