[Diy_efi] 2005 GM Vortec 4200 I-6 ECM

[Rick Frey]

At 08:13 AM 8/16/2005, you wrote:
>On 8/13/05, Brien Tourville <hh7x at verizon.net> wrote:

I have one of these in my gmc envoy and have fallen so in love with it i 
want to replace the iron duke in my 75 chevy shortbed, turboed of 
course.  This motor, being an I-6, is silky smooth and the modern valve 
train allows it to breath nicely, no complaints at all.

What issue of hot rod was that article?

Do you have the issue?  if so,

         what did he do for cams, pistons, rods and ecm?

anyone aware of any performance shops or parts for this engine?

This is a long stroke motor that runs 10:1 compression ratio on 87 octane, 
so that tells me the head was designed to ward off detonation.  both the 
head configuration and long stroke (narrower bore) should be excellent 
choice for a turbo application.

There is rumored to be a variable lift valve train in the future, if that 
happens, i can't imagine a better engine to hot rod for a driveable street 
car.  I am just not sure the present applications by gm would get much 
advantage from the change so i am a skeptic but really wishing.

of course, the valve lift would have to be switchable on the dash so you 
could engage the wild cam at idle for show purposes  ; )

no, i don't think you have to control the cams it might hurt the torgue 
curve and emissions is all, but controlling them shouldn't be all that 
hard, as i assume it is just a voltage controll.  As i learn more about 
that, i'll post.

more discussion please!

rick frey



> >
> > We've a few people who have bought
> > the I-6 GM 4200 engine for their
> > projects.
> >
> > The ECM & harness is set up
> > to control EVERYTHING on the car>
>
>do you mean that to say that it is difficult to swap one because the
>ecm needs the whole car present and accounted for?  i was thinking
>about doing one of those engines a couple months ago and then Hot Rod
>magazine had a guy in a nova wagon running low 9's on pump gas with
>one of those turboed.  i was hoping we could keep this thread going
>collecting information on these engines.  is it necessary to control
>the cam(s) or could you just set up a megasquirt on one of these?
> >
> > Does anyone here have any knowledge
> > or source of for these ?

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