LT1 +dizzy??

[JIM COTTRILL]

The system I think you are refering to is the LT1 by Indmar Marine in Tenn.
They supply marine conversions mainly to the inboard water ski boat
manufactures and they used the Nortstar DIS, I believe. If there is a
Mastercraft boat dealer in your area they may be able to enlighten. There
are alot of these boats around depending on where you live. The bigger
question is will they mate to the 8051 pcm?
----- Original Message -----
From: Dale Klein <daklein at netzero.net>
To: <gmecm at diy-efi.org>
Sent: Thursday, March 08, 2001 9:07 PM
Subject: Re: LT1 +dizzy??


> 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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