Re: [Amc-list] TBI fuel injection tuning...

[Wrambler242@xxxxxxxxxxx]

You know.
That would also explain why Frank did not see an improvement with his dual carb setup!
Nothing to improve on.
Got to wonder if the TBI will do much more than make it modern and convenient to drive?

Not trying to discourage you.
I want to see it done!
Just wondering out loud.

--
Mark Price
Morgantown, WV
1969 AMC Rambler, 4.0L, EFI, T-5
2004 Grand Cherokee Laredo, 4.7L, Quadratrac II
" I realize that death is inevitable.
I just don't want to be around when it happens! "

 -------------- Original message ----------------------
From: Wrambler242@xxxxxxxxxxx
> Hmmm, I wonder if the 196 does so well because of it's crappy old motor design 
> [your words member?]
> 
> The mix just kind of wallows around in there till it falls into a cylinder.
> 
> On the late model you have a few good cylinders.
> 
> Perhaps on the 196 there are none at all?! 
> Making it equal from cyl to cyl?
> 
> --
> Mark Price
> Morgantown, WV
> 1969 AMC Rambler, 4.0L, EFI, T-5
> 2004 Grand Cherokee Laredo, 4.7L, Quadratrac II
> " I realize that death is inevitable.
> I just don't want to be around when it happens! "
> 
>  -------------- Original message ----------------------
> From: Tom Jennings <tomj@xxxxxxx>
> > Wrambler242@xxxxxxxxxxx wrote:
> > > TPI shortens transport time and, the big thing is it makes all cylinders 
> > equal.
> > > Well, not exactly but probably not very measureable!
> > > With TBI you inject and mix in the center of the intake.
> > > You have long runners and short runners, then cylinders then, exhaust ports 
> to 
> > mix it back together and measure it.
> > > So some cylinders are probably rich and some lean.
> > > Oxygen sensor only sees the blend going out.
> > 
> > Ah! Of course! ANd this is an AMC six weakness. I always have a 
> > noticable 1&6 lean difference on all of 'em.
> > 
> > Except, oddly, the 195.6ov. OK it's a crappy old motor, but check out 
> > these plugs, lined up 1 to 6 left to right:
> > 
> > 
> http://wps.com/AMC/1963-Rambler-American/Engine/images/plugs-79000mi-Oct2008.JPG
> > 
> > 3 and 5 are the same, it's just rotated to the hot side of the plug.
> > 
> > YOu can even see the center electrode wear, these are not new plugs!
> > 
> > OK it's not scientific, but the previous set had the same color spread 
> > -- none. Maybe it's not that the cylinders are all getting good mixture, 
> > but they're at least all getting the same poor mixture! Nash did many 
> > things right on this motor.
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