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On 31 Oct 2005 at 14:21, Matthew Jones wrote: > > From: Jim Adney > > > > Earlier, I wrote: > > > > > When both points are closed, all 3 wires are commoned > > > together by the points inside the distributor. > > > > With a properly functioning set of trigger points, both > > contacts are never closed at the same time. > > Ah, that's where my assumption fails, then! I must have a > close look at the cam in the dizzy some time. I suppose it > doesn't need to have a very sharp profile or short duration. > I just had a mental picture of a valve cam shape. Its only > the timing of the opening which is important, and even that > doesn't need to be nearly as accurate as the ignition points. Right, the "duration" of that cam is a bit more than 180 deg; it doesn't look at all like a valve cam. It's really "flat" on top with a short ramp at the start and finish. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~