FW: Electronic timing advance

[HADJIASLANIS ARIS 1260 800]

Matt, Bruce & Robert,

after following your inputs and using the web as much as I could, I have
now found and ordered a XR 700 ignition unit from Crane Cams which WILL
definitely fit the original Magnetti Marell distributor of the Dino
engine and replace the twin contact breakers with an optical pick up.
This most definitely covers adequately the first part of my project,
i.e. replacement of the antiquated distributor points!

The next now is to disable the existing (horrible) centrifugal advance
mechanism, which is easy.

However the 3rd is to then need to insert a digital programmable
ignition advance / retard mapping unit between the optical interruptor
output and the ignition unit.

Hmmmm after looking in the WWW for ages I have been unable to locate
such a unit devoid of other frills or compromises (e.g. just turbo or
Nitrous Oxide retard which really is quite different from what I need).

My original posting to which you replied most kindly was ...
"... 3. Feed the optical pick up output to a digital advance / retard
unit
implementing a simple, programmable advance curve capable of at least 16
sites.
4. Optionally add an imput for a detonation sensor to provide a few
degrees of detonation induced retard.
5. The unit should just provide an output emulating a normal contact
breaker, to drive a separate high energy electronic ignition unit
(already fitted in my car)...."

Any ideas will be highly appreciated.

Regards
Aris
 ----------
From: HADJIASLANIS ARIS 1260 800
To: diy_efi at esl.eng.ohio-state.edu
Subject: Electronic timing advance
Date: 09 January 1999 23:48

Matt, Bruce & Robert thank you very much. I will use your interesting
inputs to begin assembling a viable solution to my DINO engine problem.
I guess I will start looking for the web sites of Allison, Crane
Camshafts, Holley & MSD.

Bruce, can you pls provide info about the Australian DIY kits you
mention in your reply. Concerning the diy_efi web page and project
332EFI, I am aware of it but at this instant I have too litlle time to
get involved so deeply!

Regards

Aris
 ----------
From: Matt Beaubien
To: diy_efi at esl.eng.ohio-state.edu
Subject: Electronic timing advance
Date: 08 January 1999 23:28

Bruce,

> >The requirements are relatively simple:
> >1. Replace the existing twin contact breakers with an optical pick up
> >arranged to fire every 60 degrees.
>
> Crane Camshafts in Florida, USA, makes a universal optical ignition.
>
> >2. Disable the original advance / retard mechanism.
> >3. Feed the optical pick up output to a digital advance / retard unit
> >implementing a simple, programmable advance curve capable of at least
16
> >sites.
>
> Commercially MSD, Holley make said units,  kits are available from
> Australia, for a DIY.  Use the optics to trigger a oem ecm, and just
> use the ignition part of that.  If you want to do a total DIY visit
332EFI,
> you can get there off the diy_efi home page.

The Accel 49340 (IIRC) allows what the orginal poster is looking for. It
has adjustable vacuum/boost advance/retard as well as a N20 input. It
may
require a magnetic reluctor-type signal to function though.

I don't think MSD makes something similar (you can only adjust the slope
and max advance as far as I know), and I'm not too familiar with the
Holley stuff. The Accel piece is ~$150-$200.

Hope that helps.

Matt.