What models/years had NF engine?

[Ti Kan]

chris at force5auto.com writes:
> > > I'd buy it except that the 5k 2.3L are a 1pc IM and the 100's
> > are a 2pc EM,
> > > different engine management, injection, etc. It's a different code.
>
> > You're right, I checked the intake manifold on the ETKA for the 89-91
> > 100 and indeed it's the 2pc style.  However the engine code letter
> > still says NF.  Perhaps the manifold isn't considered a part of the
> > engine code?  I dunno.  I'll have to dig deeper later.
> > -Ti
>
> Agreed, it's a toughie. It's more than the manifold too, the 2pc IM cars
> have the injectors in the manifold, not the head. It's an entirely different
> engine really. Funny, the KX and JT engines only differ in the EM, yet
> they're different codes. It was my understanding that any 2.3L with 1pc IM
> was an NF, and hence any 2pc IM was an NG code. I'll be interested to here
> what you find out.

OK, I looked further and found this out:

1. The so called "NF" engine has two versions:

   - The early version is used in the 1987-88 5000 non-turbo, has the
     old style 1pc intake manifold, and the injectors fit directly into the
     head.  The head's part number for this engine is 034 103 351 G.

   - The later version is used in the 1989-91 100 non-turbo, has the
     fancy 2pc intake manifold, and the injectors mount to the manifold.
     The head's part number is 034 103 351 D up to a certain VIN, then
     043 103 351 C from then on.

2. The "NG" engine is used on the 87.5 CGT and 1988-92 80/90 cars with
   the 10V I5, and has the 2pc manifold/head setup like the late version NF.
   It uses the 034 103 351 C head throughout.

Conclusion:
The early NF engine is basically a 2.3 liter, high compression version
of the earlier KX/KZ/JT line of I5 2.2 non-turbo engines.  The late
NF is also 2.3 high compression 130hp, but has the 2pc intake manifold
and different head.

Whew!  Talk about confusing.  So when we refer to an "NF" engine we'll
have to be clear which version we're talking about.  Maybe coin them
NF-1 and NF-2?

-Ti
01 S4 2.7 biturbo quattro
84 5000S 2.1 turbo
80 4000 2.0
--
    ///  Ti Kan                Vorsprung durch Technik
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