GM-HEI Modules

[Shannen Durphey]

I

Sandy wrote:

> Thanks Bob, the stuff that I have seen on the ECS HEI modules is out of the
> Chilton's (Chitlins) book on GM Engine Electronics, seems to be pretty good
> at describing the pins, functions, and testing the modules. I always liked
> the HEI's, simple and usually pretty rugged. I'll be down at the autoparts
> store this week and pick up a module and try it with a 'Dummy' load and see
> what it looks like.
>
> Sandy
>
> At 01:01 PM 2/17/98 +0000, you wrote:
> >Sandy
> >
> >I have adapted HEI to VW.  The small pins(2) get the AC voltage from
> >the reluctor (maybe around 5v).  Check it with a scope as it is not a
> >sine wave.  My understanding is that it has to go negative to turn
> >off, so it may have an SCR(silicon controlled rectifier).  I don't
> >think you have to worry about the coil drawing too much current.
> >The old HEI transformer(coil) put out one of the hotest sparks going.
> >Their problem is that if there is no load on them(spark plug), the
> >voltage goes so hi that it arcs internally and ruins the coil.
> >
> >Bob McKnight
> >Phx AZ
> >
> >PS If you have any details on the later modules, please share it.
> >PPS To the best of my knowledge, they are just a switch.
> >
> >

  I've got some GM service info... If you've got some specific questions, I
could try to answer them.

Shannen