LT1 +dizzy??

Fri Mar 9 02:07:03 GMT 2001

Or better yet, the marine LT1 engine front cover, w/ crank sensor.  Someone 
mentioned this here a little while back.  Did anyone find out more?

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Date: Fri, 08 Dec 2000 19:28:42 -0500
To: gmecm at diy-efi.org
From: Speartech <speartec at iquest.net>
Subject: Re: DIS for GMECM
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The special cover is marine part.  If I had some MEFI2 info I would share 
it. I do have the complete schematic of the controller including the 
optional inputs (like O2 sensor), that were never activated in the 
software. But I'm guessing you're after programming info, which I don't have.

         John

 >
 >
 >Date: Wed, 06 Dec 2000 01:04:31 -0500
 >From: Shannen Durphey <shannen at grolen.com>
 >Subject: Re: DIS for GMECM
 >
 >
 >Hello! This is interesting...
 >2 questions :
 >Is this special cover package a marine or automotive part?
 >Do you have any MEFI2 info that you're willing to share?
 >Shannen
 >
 >
 >Speartech wrote:
 >>
 >> 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

At 07:33 AM 3/9/01 -0500, you wrote:
>With all the talk about adapting LT1 engines to use with non-opti spark 
>systems, I
>missed the fact that the components are quite possibly available from GM.
>
>In 1996, the LT1 and LT4 engines were converted to use OBDII emissions 
>systems.  As
>part of the new system, GM installed a 4 notch reluctor type wheel on the 
>crank and
>a corresponding sensor in the front cover.  The wheel slides on the front 
>of the
>crank and gets sandwiched between the balancer and the timing gear.  The 
>timing
>cover is a bolt on for the earlier models.
>
>I haven't researched whether the timing gear or the hub (these engines do 
>not have
>a traditional chevy balancer) are the same as earlier models.  It's 
>possible that
>the 4 notch wheel is the same part as used on Vortec 8cyl smallblock 
>engines, and
>the sensor may also be a common part.
>
>Just wanted to put the info in the list domain while I was thinking about it.
>
>Shannen
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