<VV> Manifold heat soak

[JVHRoberts at aol.com]

If you're talking exhaust manifolds, it simply will melt. That's why the  
turbine housing is cast iron. 
The reason the rest of the turbo doesn't melt is there's a heat shield  
between the turbine housing and the bearing housing, and there's somewhere  around 
1/2 a gallon of oil per minute cooling the thing. 
Of course, the compressor end gets nowhere neat hot enough to be an issue. 
I have seen melted turbo cold ends in car fires, however...
There's a reason why no production cars have aluminum exhaust manifolds,  and 
the few marine applications that do, are water cooled. And they melt when  
the cooling fails. 
 
In a message dated 8/4/2007 10:25:29 AM Eastern Daylight Time,  
crawfordrose at msn.com writes:

Look, if it doesn't work, then why did the aftermarket supply and market  an 
aluminum product for that purpose? It should work for a normally  aspirated 
motor with a 460 valve temps; I don't see why it would "fail".   It might get 
soft; it might leak; it might corrode quickly. However, this is  not to say it 
won't work to pass exhaust to the muffler. Using that reasoning,  my 
turbocharger bearing housing should be molten scrap, adjacent to the 600  degree turbo 
exhaust, after a hard run.
Crawford Rose

----- Original Message ----- 
From:  _JVHRoberts at aol.com_ (mailto:JVHRoberts at aol.com)  
To: _crawfordrose at msn.com_ (mailto:crawfordrose at msn.com)  ; 
_virtualvairs at corvair.org_ (mailto:virtualvairs at corvair.org)  
Sent: Saturday, August 04, 2007 6:58  AM
Subject: Re: <VV> Manifold heat  soak



Sure, then you'd have cast aluminum in the shape of the lower shrouds.  <G>





 



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