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On 19 Sep 2006 at 9:40, andy wrote: > > You can certainly do this with a scope, but most of the time that's > > overkill. 45 degrees would correspond to a 50% duty cycle (45 is half > > of 90 and each cylinder gets 90 degrees of the distributor rotation.) > > > > Your dwell meter is probably made to work with 8 cylinder engines, > > where a 50% duty cycle means 22.5 degrees of dwell. Most dwell meters > > have a switch for different numbers of cylinders or different scales > > to read from depending on your number of cylinders. > > hmmm. I was thinking the duty cycle would be less but I didnt consider the > 4 lobes in the dizzy. I was thinking about just 1 cylinder. Yeah, the most desirable duty cycle is just a bit over 50%, or about 50 degrees (for a 4 cylinder engine.) -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~