explanation for additional thoughts...caddy-olds and the buick

[Shannen Durphey]

gmecm at efi332.eng.ohio-state.edu wrote:
Each module handles 1/2 of the spark needs.  Module 1, then module 2,
then 1.  If the module 1 crank sensor is positioned at TDC for #1,
then the cps for module 2 must be positioned for TDC for the next cyl
in the firing order.  This is 90 crank degrees from #1 TDC.  The
"crankshaft ring"  will have enough notches for a 4 cyl engine, and
this will cause each module to put out 2 reference pulses each engine
rev, for a total of four.  The ECM only has one reference pulse input,
so the two module output lines must be tied together.  The ecm outputs
signals for the module, but it has no way to switch the signals
between the modules, since it's designed for only one.

Or were you asking about the 4 coils/one 7 term module?
Shannen
> 
> Now I'm lost--can you point me at a book or paper so that this will make
> more sense.
> Mike
> 
> At 08:07 AM 11/11/1999 -0600, you wrote:
> >Right on the money Shannen ,Your thinking what I was thinking of doing with
> >the 4 cly coil paks, the  2 crank sensors 90 deg ,ref pulses, 1 coilpak
> >master, 2nd coilpak slave   ect. I would batch fire the injectors so you
> >wouldn't need a cam sensor. The north star system would of course work, but
> >I thought we were looking for a cheap alternative. I have also wanted to try
> >4 pickup coils 90 deg around the balancer ,each pickup feeding a 7 term HEI
> >module. The HEI module would fire a coilpak. All controlled by the ECM,batch
> >fire the injectors. The Ref pulses would need to be figured out. Interesting
> >stuff.
> >
> >Don
> >
> >
> >
> >
> >> -----Original Message-----
> >> From:        Shannen Durphey [SMTP:shannen at grolen.com]
> >> Sent:        Wednesday, November 10, 1999 7:58 PM
> >> To:  gmecm at efi332.eng.ohio-state.edu
> >> Subject:     Re: additional thoughts...caddy-olds and the buick v6
> >>
> >> Shannen Durphey wrote:
> >>
> >> > > >
> >> > Thinking out loud, please correct me....
> >> > You'll need to have 2 crank sensors, offset 90 degrees around
> >> > balancer, and tie module ref outputs together, but keep pulse from 1st
> >> > module away from module 2, and vice-versa, and you definitely don't
> >> > want to run it with SFI unless you can guarantee that module for cyls
> >> > 8+5, 3+2 never sends ref. pulse first.  Didn't the caddy 4.1/4.5l and
> >> > the Norstar have DIS?
> >> > Shannen
> >>  EST line needs to be seperated also, yes?  Signal from ECM to module
> >> must be split up between the pair of modules.
> >> Shannen
> >