[W126 Coupe] Exhaust coatings

[Jim Nowak]

Why would the high RPM engines not benefit as well?

>From pictures that I've seen, they do run ceramic
coatings on many of the F1 cars.  The exhaust velocity
is so much higher in the F1 engines that the air is in
and out much much faster than your typical car engine.
 I wouldn't think that the exhaust gasses have too
much time to cool in an F1's racing application due to
the extreme velocity and very short exhaust system.  A
typical car exhaust is much longer so the effects are
much greater when you factor heat loss slowing the
exhaust velocity.



--- Dan Landiss <dan at landiss.com> wrote:

> Jim Nowak wrote:
> > using the correct size exhaust plumbing for your
> engines output.  Exhaust plumbing that is too large
> will slow your exhaust velocity and rob you of power
> as does exhaust plumbing that is too restrictive. 
> Not to mention, keeping excess heat from your engine
> bay helps your engine run cooler.  
> >   
> With the emphasis on "correct". If the plumbing is
> too small, letting 
> the exhaust cool a bit could help because the volume
> will contract. SO: 
> too big = too slow velocity; too small =
> restrictive.
> 
> Why would the high RPM engines not benefit as well?
> They sure go to a 
> lot of trouble to "tune" the pipe lengths, so it
> cannot be said that 
> extraction effects are meaningless. And if I were an
> engine designer I'd 
> SURE want those bright red pipes to keep their heat
> to themselves! 
> <http://tinyurl.com/27wqr*>*
> 
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