DIS for GMECM

[Speartech]

I do have pics. I am having trouble finding them, but when I do I will put 
them up. I am thinking about just buying the parts for some experimenting 
anyway. It's really slick looking. The N* DIS is mounted vertically on the 
front of the engine/cylinder head, on the drivers side. I'll find those 
pics here somewhere.

	John

 >Date: Wed, 06 Dec 2000 09:39:32 -0500
 >From: Len Sabatine <sabatine at epix.net>
 >Subject: Re: DIS for GMECM>
 >
 >   Hey John , have heard of DIS on LT Marine  Apps , have not seen though,
 >got any Pics ? . You mention OptiSpark 92-4 Spline drive , Ha , New LT1s had
 >   a sloppy  chain , kinda defeated the 1d res of the dist. Gm offered an O
 >size crank gear as a slop fix. At any rate, the Nstar style Pkg would
 >indeed eliminate
 >   the monkey motion for sure. While still lots of Plug wire , multiplying
 >spark and dividing the load X 8 ,  Can't be wrong by any stretch. Yes,
 >crank reluctor with
 >   Lo-Hi Res sensor positions and "usual" module sense scenario does lend
 >itself to wider usage on other controllers that process like signals.
 >Marine Apps ,
 >   not needing to do FTP certifications, can be  OEMs  spring board
 >development arena for Wana Be Vehicle programs to come.
 >    Len
 >
 >
 >>Exactly!!  Makes me think back to the LT1 Optispark distributor.  All the
 >>hoopla about 1 degree resolution with the 360 deg optical sensor, and then
 >>go and hook it all together with a timing chain and a little splined drive
 >>off the front of the camshaft!  Many folks are unaware of the fact that
 >>when the LT1's were used in the Mastercraft ski boats, they used the
 >>Northstar DIS, NOT the Optispark. The Nstar reluctor wheel mounts on the
 >>back of the harmonic balancer, and a new timing chain cover is used with
 >>the 2 crank sensor mounting saddles cast right into the cover. It's a neat
 >>little package! The 2 crank sensors feed directly into the full-function
 >>DIS module, it decodes and processes the signals, and then you have the
 >>usual connection to the ECM (REF HI, REF LO, BYPASS, and EST. In the
 >>marine application they used the MEFI-2 controller, but hey, it COULD have
 >>been a 730/727 controller.
 >>
 >>         John
 >>
 >>
 >> >Date: Tue, 05 Dec 2000 18:46:42 -0500
 >> >From: Len Sabatine <sabatine at epix.net>
 >> >Subject: Re: DIS for GMECM
 >> >
 >> >
 >> >Think , elimination of distrib gear , rotor ,cap , carbon brush , air
 >> gaps,  slop in the timing sys , ionization ,torsional vibes traveling thru
 >cam,
 >> > oil pump disturbances , coil and plug wires and their routing. All
 >> the >monkey motion and associated spark delivery problems , GONE,
 >> especially with
 >> > CNP ignition sys. Spark scatter and inductive X fire tendencies ,
 >> GONE.  " Nearly" perfect spark delivery and repeatability is now possible .
 >> > Add to  that , Coil drivers are on each coil , not on PCM Motherboard.
 >> A very high degree of "recovered loss" in Ignition efficiency has come to
 >> pass. The
 >> > ms latency ,spark propagation time has also been reduced substantially.
 >> > Hope I've gotten the idea across.
 >> >     Len
 >> >

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