Ceramic coating, intake manifolds

[Huw Powell]

> I was told that the intake manifold is supposed to act as a heat sink and
> absorb heat from the intake air.  This sounds totally backwards from
> everything I've ever heard. 

And backwards from my occasional observation.  I think the IM gets 
heatsoaked by the head (and the EM, on the 10v).  The incoming air cools 
it.  I base this on noting that while the engine is running (parked, 
hood up) the IM is quite cool to the touch.  Turn it off and within 
minutes it is rather warm.

Somehow I doubt that ambient temp air from the intake could be cooled by 
a hunk of aluminum that is also being cooled, at best, by more ambient 
temp air running on the outside of it.

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/