[s-cars] Update on my 20V motor with pictures (Ned, Mihnea, et al)
joeamund at online.no
Thu Mar 4 14:13:00 EST 2004
James,let me clarify my wiev from the pictures:
The engine block including pistons as seen and the cylinder head looks to me
100% like the original street engine for the sport quattro(see my other reply
on the numbers). It could be some Audi Sport product as well since they had
three(at least) versions of the alu block, one with cast iron liner-one
without liner and one without liner but treated with nicasil as the never
engines are. But since the engine serial number is KW 000 085 i would think it
was the street engine. Anyway it does not matter it is unique in all ways!
The water grooves are original as is the unique holes in the block and
cylinder head in order to improve cooling which was a problem those days. This
is due to weak alloy and they had to cast it with thicker walls which
resulted in poorer cooling(too much material between the water and combustion
chamber reducing heat transfer). That is why this engine is so special, even
though it physically looks alike from the outside compared to a regular
S4/S6/RS2 20V engine. All the internals on the Sport quattro engine are
totally different and all rally-racing derivates.
What I say on the intake manifold and spacer between this manifold and the cyl
head is that this is Lehmann stuff. The spacer serve only one purpose and that
is to lead water out of the cylinder head and not into the intake manifold as
the original motor was constructed. Lehmann supplied both single and twin
injector conversions mainly due to the availiability of large enough single
Put it this way :those who had a original sport quattro took out the original
motor, delivered it to Lehmann who took it apart and blueprinted the
internals. Then they installed a new intake+spacer+tubular header+KKK27 turbo
and voila 420 HP for the street. The low compression will give you big mid
range torque when properly set up with the right turbo.
I do not know what kind of exhaustmanifold or turbo you are using James, but
this engine is capable of a lot more than 180 whp. I would step up a bit on
the cams however.
I would suggest a Autronic SM2 engine management system with a wide band O2
sensor. But the best would be to put away this unique power plant and go with
a RS2'ed new type 20V engine. On the alloy engine if you brake a cylinder head
or block it is almost impossible to repair unless you are well connected in
Lichtenstein or Audi sport.
reg Joern,MTM RS Avant
>===== Original Message From James Bufkin <jbufkin at austin.rr.com> =====
>Thanks for the reply! Appreciate it a great deal.
>My problem with the motor seems to be the homologation of 3b cams, 3b ECU
>to this block and head. Its bizarre, but that low compression would create
>low power output would it not?
>I understand what you mean the intake casting and the aluminum adapter
>plate to make it mount to the head. This intake has one injecter per
>Are you saying the Engine is a Sport Quattro block and Head (from the
>street car?) Or is it more of an Audisport product. I'm confused cause
>you mention that original sport quattro owners could have this modification
>done by Lehman. Did Lehman machine the groves for those blocks which
>weren't so machined? Also were all aluminum blocks so lined?
>My car was making 1.7bar of boost and producing 182 wheel horsepower.
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