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Re: [T3] dwell meter using oscilloscope?


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

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