triggering an HEI module

[Bruce Plecan]

IF that were true there would be  no timing change reguardless of how the
reluctor is wired up.   What you mention is what GM teaches, which ain't the
truth on that item.  Sorry to crush you with the horrors of the truth.
<g>...
Bruce


> The signal into an HEI module is far from a sine wave. It
> looks like a slowly rising voltage which rises faster and
> faster as the pole pieces come together.  Just as the poles
> pass peak, the voltage very, very  quickly reverses polarity
> to about the same but opposite voltage.  Then it decreases
> like a mirror of the first part.  Then it crosses zero and starts
> climbing again for the next pole alignment
>
> The spark is triggered by that very rapid voltage reversal at
> the peak pole alignment.  The amplitude varies a lot with
> speed, but the point of reversal is consistant.  Bruce Roe
>
> On Thu, 8 Mar 2001 19:59:23 EST Tedscj at aol.com writes:
> > Hi,
> > Has anyone tried to determine what type of signals will trigger an
> > HEI module?
> > To be more specific with what I want to achieve:
> > I have a little foreign four banger with a really pitiful points
> > ignition.  I
> > was thinking of converting it to GM DIS as a first step towards
> > full-blown
> > GM-EFI.
> > The problem is that the only after-market conversions from points
> > available
> > for this car are to 'optical sensor' ignition, which will result in
> > a square
> > wave signal from 0v to 12v.  I know HEI modules (and DIS) are
> > looking for a
> > sine wave.
> > Does anyone know if a square wave will trigger the module?
>
>
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