Cayenne vs Touareg

[Ti Kan]

Tom Leppke-Hennig writes:
> This thread has reminded me of a question I have always had, but never
> been able to find a clear answer on: What is the inter-relationship of
> all the different V8s in the VAG/Porsche family?
> 
> These are the ones I am wondering about:
> 
> Porsche V8 #1: Used in the 928, various displacements and head
> configurations, but always the same foundation.

No relationship to any Audi V8 engine here.  That's Porsche's own.

> Porsche V8 #2: Cayenne. Related to Porsche #1 or Audi #1 or #2? I don't know.

I don't think it's related to the Audi V8 at all.  I am under the
impression that this is an all-new V8 from Porsche.  Not 100% sure though.

> Audi V8 #2: Used in A8, A6 4.2, Tooregg. Related to Audi #1? I don't know.

Yes, it's an evolution of the original Audi V8.

> Generally, developing a whole new engine architecture is expensive, so
> companies borrow heavily from existing architectures like The I-4, or the 
> I-5, or the 924 I-4, which is where I think the 928 V8 came from.

Actually, the 924's I4 is an Audi design, but Audi never used that
same engine in its own models (I understand that its forerunner is
the one from the 100LS.  That engine is does not have the same bore
spacing as the VW I4).  The 944's 4-cyl engine is basically half
the Porsche V8.

> Tom LH
> 1995 90 with suspiciously VW 2.0l X-flow 8V looking cylinder-heads.

Yes, the Audi V6 has similar architecture in general to the V8
(90 deg V, same bore spacing, etc), which is again similar to two
VW I4s.  However, not many large parts interchange.

-Ti
2003 A4 1.8T multitronic
2001 S4 biturbo 6-sp
1984 5000S turbo
1980 4000 2.0 5-sp
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