z1kzonly wrote: ...He said all of those VTR guys were using newer car single coil packs on their plugs. He told me why not the 4 cyl kaws? 2 cyls fire at the same time. Sorta makes sense? Or it might just be an ugly thing? Having them on your spark plugs? I'm sure if it works? someone would have done it??? Just a thought.
Yes, I've thought about it. I personally find them ugly. Seems like they would be jiggly on the end of the spark plugs when you hit bumps etc.
So are they just coils on the plugs or do they have an igniter built in?
If they are just a coil then you still need an igniter. And if the coils have very low resistance, you will need an igniter with short dwell. The factory dwell would be too long and the Dyna S would be way too long.
If the coils are about 1.5 ohms or so, you could put two in series. This would put the overall resistance at about the right level, but each coil would only be working at 6v.
If the coils also include an igniter, you will need some sort of circuit between the pickup and the coil pack to get the dwell and timing correct.
These problems can all be overcome, but with the ugliness factor, I never looked into it.
One of my projects that ais on the back burner is to use Hyundai car coils, which are dual-post coils. They are nice and small, can fit under the tank of a 550, and are super cheap. But it will be awhile before I get into that.