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

[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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