a single coil system..... early hybrid electronic ignitions had ""dwell extender" circuits in them via amplifying the points signal to a higher current device thus allowing the coil to charge to a higher magnetic field thus storing more potential energy for each fire cycle. And they also buffered the points to a very low current so that they did not burn. We used to build them for our race cars in the late 60s early 70s... HeathKit made one that used a multivibrator to create the higher voltage fed to the coil. This model had a bypass switch so you could run it in bypass mode or in amplifier mode. Switching it from off to on on a carbureted engine you would see a 200 rpm increase at an idle from the longer firing time, creating better and more complete combustion. You could open the plug gap up from .035 to .040 to see more improvement. Ironically, a conventional points system on a single coil, worked at less efficiency, where a magneto worked better as rpms increase. So the early dwell extender modules fixed this problem somewhat. Later the hall effect transducers eliminated the points totally so the wear, conductivity, and moisture problems were removed from the equation. Then emissions drove the high voltage systems coils that better fired off the combustion cycle and made the previous redundant. Later by using a coil for each cyl gave the engineers more control with variable timing, ability to fire every other cyl, and solve the coil charge time (at high rpms) problem as well. Now a coil only had to fire one cyl instead of 8 cyls....This also ,as other have said, removed the distributor, and its associated problems. This allowed the ecu to map the timing all over the place with different logic than just rpm... ie deceleration, overheating, ping sensors, maps for differernt gears, modes etc. Throw in variable cam timing, and variable fuel injection control and you can do the impossible.
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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