Driving an HEI Module with other signals

[Don.F.Broadus at ucm.com]

You are right on the money about the step advance built into the  7 wire
modules . I have observed this on my distributor machine using a timing
light on the degree wheel.  Non stock modules have different step advance
points and amount of advance. I have tested the small cap HEI modules
(external coil) and they have similar step advance in by-pass mode. 
Don




   

> -----Original Message-----
> From:	mike mager [SMTP:mikemager at hotmail.com]
> Sent:	Thursday, March 23, 2000 9:24 AM
> To:	gmecm at diy-efi.org
> Subject:	Re: Driving an HEI Module with other signals
> 
> The (however many wire it is?) HEI module was designed from conception to
> be 
> operated by a logic signal!, so doing so means just that - connect a logic
> 
> signal! - 'Turn on' the bypass mode, and just feed the logic input;  the
> VR 
> input is needed/used only for starting/limp-home on those old things.
> 
> Without the VR _input_, you lose the _reference _output_.
> 
> The truth about about advance in the module when using the VR input only
> is 
> a lot different than what I have seen in any of the books (they all say
> 'no 
> advance');  the module provides a step advance above some RPM 2,500, or so
> 
> (this means don't forget to plug in the distributor cable!
> 
> Mike
> 
> 
> >From: Brent Obermiller <ober_b at sssnet.com>
> >Reply-To: gmecm at diy-efi.org
> >To: gmecm at diy-efi.org
> >Subject: Re: Driving an HEI Module with other signals
> >Date: Thu, 23 Mar 2000 09:41:10 -0500
> >
> >This may be more of a question than comment:  I thought I
> >read somewhere that the electrical caused by the reluctor
> >shifts phase at different rpm (or rate of cutting flux
> >according to Maxwellian Theory).  Additionally,  it went on
> >to say that the GM module compensated for that.  The point
> >being (if this true) is that the point wouldn't shift and
> >the module would introduce a skew to the timing curve.
> >-Brent
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