[Diy_efi] dis 90 cutlass v6 3.1

Wed May 17 04:42:00 UTC 2006

Tom
By DIS I'm assuming the initial poster was referring to Direct Ignition 
System which was the GM acronym for the distributorless ignition system used 
by the Chevy 60 degree MFI V6 engines of that era. (90 Cutlass)
In DIS the sync notch is embedded within the VR crank sensor signal (based 
on the "7th" notch in the 6X reluctor) and used strictly for coil sequencing 
not SFI. You must be thinking of another engine that uses separate cam sync 
for SFI and 2 channels of hall-effect crank triggers for coil sequencing (eg 
C3I - Compute Command Coil Ignition used by the Buick 3.0/3.8 V6s)
WOT
----- Original Message ----- 
From: "Tom Visel" <five10man at commspeed.net>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, May 16, 2006 6:28 PM
Subject: Re: [Diy_efi] dis 90 cutlass v6 3.1


> Running on that assumption, a hole could be drilled in the sheet-metal 
> timing cover, and a cam sensor inserted through a plain grommet to read a 
> magnet for a sync pulse.  Not that DIS cares which injector is firing, but 
> might as well get the easy bits out of the way.
> TomV
> P.S.  Aren't there dead vehicles formerly motivated by 3.1s all over 
> junkyards?  Or maybe an engine builder could see his way to giving up a 
> useless 3.1 crankshaft.  Whatever the source, a bit of lathe or mill work 
> would result in the original crank trigger being available to bolt onto 
> the front of the crank.  Just a thought.  That makes three today, hope 
> I've got enough left over to recertify tonight...
>
> WopOnTour wrote:
>
>> LML
>> If you look at the subject line and initial post, the question was how to 
>> add DIS to the existing engine. My post was based on that assumption.
>> WopOnTour
>>
>> ----- Original Message ----- From: "Lee M. Lemoine" <llemoine at gmail.com>
>> To: <diy_efi at diy-efi.org>
>> Sent: Tuesday, May 16, 2006 7:59 AM
>> Subject: Re: [Diy_efi] dis 90 cutlass v6 3.1
>>
>>
>> I was thinking if its going to be running a distributor there wouldn't be
>> much need for coilpacks, nor a synch pulse.  (just fire the damn coil and
>> let the distributor worry about it)...   *shrugs*  hey, why not 
>> oversimplify
>> things ;)
>>
>>
>>
>> On 5/16/06, WopOnTour <wopontour at hotmail.com> wrote:
>>
>>>
>>> Really?
>>> Pray tell...
>>> How else is the DIS module going to correctly synchronize the coil 
>>> packs??
>>> WOT
>>> ----- Original Message -----
>>> From: "Lee M. Lemoine" <llemoine at gmail.com>
>>> To: <diy_efi at diy-efi.org>
>>> Sent: Monday, May 15, 2006 8:06 AM
>>> Subject: Re: [Diy_efi] dis 90 cutlass v6 3.1
>>>
>>>
>>> forgot about the sync pulse.  Dammit!
>>>
>>> On 5/15/06, WopOnTour <wopontour at hotmail.com> wrote:
>>> >
>>> > Larry
>>> > Assuming the inline engine is using even fire 120 degree crank pinning
>>> > with
>>> > 3 pairs of identically phased running mates,(I know nothing of this
>>> old
>>> > girl) IMO machining a crank driven reluctor would probably be easiest.
>>> > Distributor triggering would be almost impossible as it runs at 1/2
>>> engine
>>> > RPM so you would need 12 evenly spaced pickup coil triggers PLUS a 10
>>> > degree
>>> > sync pulse. I guess you could add a tooth somehow to a 12 cylinder
>>> > distributor?? Still think a bolt on crank wheel would be easiest if
>>> you
>>> > are
>>> > dead set on using the V6 DIS
>>> > HTH
>>> > WopOnTour
>>> >
>>> > ----- Original Message -----
>>> > From: <ltallant at alltel.net>
>>> > To: <diy_efi at diy-efi.org>
>>> > Sent: Sunday, May 14, 2006 9:04 PM
>>> > Subject: [Diy_efi] dis 90 cutlass v6 3.1
>>> >
>>> >
>>> > > It is a 1958 Chevy 235 in-line 6.  Would it be possible to machine a
>>> > crank
>>> > > wheel and bolt it to the front pulley, or use a different type
>>> position
>>> > > sensor on the distribuor?  The other concern I have is the intake
>>> ports
>>> > on
>>> > > the head are siamesed, so there are only three round intake runners
>>> > about
>>> > > 2" in diameter.  Thanks for all your input so far.
>>> > >
>>> > > Larry Tallant
>>> > >
>>> > > _______________________________________________
>>> > > Diy_efi mailing list
>>> > > Diy_efi at diy-efi.org
>>> > > http://lists.diy-efi.org/mailman/listinfo/diy_efi
>>> > >
>>> > _______________________________________________
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>>> >
>>>
>>>
>>>
>>> -- 
>>> Sincerely,
>>>
>>> Lee M. Lemoine
>>> http://www.turbochargedsoul.com/
>>> '06 Subaru Legacy GT Limited - 250/250 AWD 5EAT
>>> '93 Chevy Cavalier Z24 Convertible - 300/330 FWD 5MT (Mclaren Turbo!)
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>>>
>>
>>
>>
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