DIS for GMECM

[Bruce Plecan]

> So the benefit to going w/o distributor is to prevent missed/deformed
> sparks?

It's results that count, around here there is too much haggling over the
ways so, I just going with end results, anymore.

>  I always figured it was to get better timing accuracy.

That is not universally true.  More often then not yes, they can have
greater 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?

Simplicity is the key to design.  Fewer sparks leaping around the better.
Hard to have absolute control on 50Kv lookin for a ground.
The reason is to min power loses thru the ignition system.
Engine design and management is all about igniting a reaction, and then to
recover the energy from that reaction.  The closer you get to 100% on both
the better.
Bruce

>
>  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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