holley 4d_ efi changes??

[Bruce Plecan]

-----Original Message-----
From: Raymond C Drouillard <cosmic.ray at juno.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Wednesday, November 25, 1998 1:04 AM
Subject: Re: holley 4d_ efi changes??


Is the Duraspark a reluctor/coil type distributor?.  Did you test for
800-1000 ohms?  Is it any good?
Try a 1K resistor, and LED across the two wires from the dura.  A moderate
spin by hand should make the light flicker.  Just for grins try both
"polarities"
One is "hot", and the other grounded.
  I've heard from another source where one duraspark worked, and another
didn't.
Bruce

>
><snip>
>
>>>One feature that I have yet to use is the programmable ignition timing.
>
>>>Does anyone here know how to get a GM HEI to listen to a Motorcraft
>>>Duraspark pickup?  If someone has a copy of the doctor's guide to
>>>optomizing your ignition, I would appreciate a quick recap or scanned
>>>page or whatever.
>>
>>If there are two wires leading from the pickup coil in the distributorr
>>and if thye have 800-1000 ohms resistance then just wire them into
>>the gm module, as "normal" the thing is that the can be reversed so
>>you need to make sure your set up is as advanced as possible.
>>  I forget where but their was another posting just recently saying
>>this was backwards (using the most advance combo, do to rotor
>>phasing), might try it both ways, and report back (please)
>>Cheers
>>Bruce
>
>I tried that.  It wouldn't fire the module, no matter what polarity I
>tried.  Someone with a 'scope looked at the output of a duraspark and a
>GH HEI distributer and the duraspark had a stronger signal.  I suspected
>the module, so I hooked the HEI distributer to the module and twisted it
>by hand.  I was getting lots of spark and the injecters fired.
>
>The only thing I can figure is that there is an impedance difference or
>one is grounded and the other one floats.  If I had a little equipment, I
>could make an adapter with an op-amp without any trouble at all.  As it
>is, I don't know the characteristics of either signal.
>
>Ray
>
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