Divide it by 3 and you've got the number of revolutions per second, not per
minute.
Multiply your reading by 20 (60 seconds in a minute, and the meter reads pulses
per
second, then divide it by 3).
Power British Performance Parts, Inc. wrote:
> Peter Zaborski wrote:
>
> > I have a question for those on the list who have some automotive electrical
> > knowledge...
> >
> > I have a multi-function digital multimeter which has a frequency function.
> > It measures the frequency as cycles per second (Hz) based on (I think) the
> > pulses it gets from whatever source it is hooked up to.
> >
> > I hooked it up to my TR6 coil's negative post while the engine was running
> > to try to verify my mechanical tach (car has the stock engine, stock Lucas
> > distributor and aftermarket Ingnitor electronic ignition module -- I think
> > this is a single spark ignition module). I did get some readings which
> > appear useful. However not wanting to jump to any conclusions, I wonder if
> > anyone who knows about such things cares to describe what readings I should
> > have gotten in cycles per second connected to the coil's negative post.
> >
> > Looking forward to any replies.
> >
> > --- Peter Zaborski CF58310UO ---
>
> A 6 cylinder engine fires 3 times per crankshaft revolution. Divide the
>frequency of
> the coil output by 3 and that should be your RPM.
>
> Good luck!
>
> Brian Schlorff '61 TR-4 '64 TR-4 '72 TR-6 '79 Spit
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