Re: DIS for GMECM

[Speartech <speartec@iquest.net>]

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@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@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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