Wow.
I ordered enough "stuff" last nite to make 10 units, maybe should order some more (?).
It won't arrive until mid-December, says the post, because they are coming from Motorola Singapore, so they must pass customs. At this season, that will take a few days. Add in Christmas (family, ya know...) and intermittent warm-enough-to-test-outside January weather, and it may be late January before I have packaged versions.
For those of you who are circuit-board "sparkies", I might be able to rustle up a kit form. The circuit is similar to the one Ford used on the SOHC 427 engines (8500 RPM capable), but simplified to remove the RPM limits, sort of like the one GM had in the Corvette (and, I think, the Z-28 Camaro?).
I am sizing the electronics to run 8-amp coils so there's plenty of "headroom". This will mean that any two-coil setup will work. The bugger has always been the 2-output coils on 4-cylinders, because they tend to have a prolonged "kickback" at the transistor, due to imperfect matched windings on the 2 outputs. So, any engine with 2 smaller (1-output) coils will work OK with them, too.
The weather has been colder than normal here, which has hampered the Swingarm service thing (the garage has limited heat, and metals don't like to be turned cold: it makes them hard to measure to a final dimension). So, maybe I'll make these until it warms up a little more.
I've personally always liked this style better than the Dyna, because it is harder to change out the Dyna if it dies on the side of the road somewhere. This one just requires swapping those little bullet connectors and you're on your way again, with stock sparks. With it, you usually get better MPG and smoother performance. If you're into lots of RPM, it helps there, too, by keeping the coil current "like new points" forever. With the high-flying cost of the points these days, it seems like a good time to bring this out again.
The main difference between this arrangement and, say, a Dyna III, is this: the Dyna units increase dwell a few degrees, which is how they boost the spark voltage a little on stock coils: the voltage doesn't "droop" so much above 2500 RPM. This transistorized version, with stock ignition settings, won't improve the "droop", but will keep the coils always running at full current, like a fresh tuneup. If you decrease the points gap a little, this will increase dwell a little (about 3 degrees or so) while also reducing rubbing block wear and increasing the upper RPM limit before points bounce sets in. And, it's cheap!
I'll keep ya'll posted (my wife's from Texas, gotta practice for the relatives for the upcoming holidays...).
