DIS for GMECM

[ae2598 at wayne.edu]

So the benefit to going w/o distributor is to prevent missed/deformed
sparks?  I always figured it was to get better timing accuracy.  I sorta
figured you'd get more energy jumping the spark gap with coil-per-plug (is
there a industry buzzword for this?) than with systems that use
conventional ignition wires.  Is this not the real reason?

 On Tue, 5 Dec 2000, Bruce Plecan wrote:

> 
> 
> Allz said and done, DIS will get you about a 2% less misfire rate.
> Meaning thou the AF mixture was lit, the flame front for what ever reasons
> was unusual, and genereated less energey for that event.   Not to be
> confused with a *miss*.
> Coil per Plug can get you an addition 1% improvement, and get right near
> 100%.
> Bruce
> 
> 
> > As best I understand it DIS allows a longer dwell (charge time) for a
> given
> > coil at higher RPM's, resulting in a hotter spark.   You also eliminate
> the
> > wear of air gaps at the distributor caps.   Less moving parts, less
> failure
> > points is good from the OEM point of view.
> > Also, advance is "unlimited" since you don't run into rotor phasing
> issues.
> >   This still confuses me, since it's my understanding that there's almost
> > no app that you would want more than 45 or so degrees of advance anyway,
> > from the tone of a lot of messages recently.
> > -> Bob Valentine
> > -> bob at tecmark.com
> 
> > At 06:51 AM 12/5/2000 -0800, you wrote:
> > >DIS=Distributorless Ignition System?
> > >So what's the point of trying to get a "DIS" working on an AUJP/730 if my
> > definition of DIS is
> > >wrong?  Explain to me why there is this holy-grail of getting DIS running
> > on a V8/730.
> > >Squash
> > >--- Chipsbyal at aol.com wrote:
> > >> This is not a DIS system as it is a distributor less system. This is a
> CNP
> > >> coil near plug system. Each cylinder has its own ignition module, coil
> and
> > >> plug wire. The interface that was at the show only drives the separate
> > >> modules. Speed Pro also had an interface to use this CNP ignition for
> > their
> > >> systems.
> > >> AL
> 
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