<VV> Manifold heat soak

[Crawford Rose]

Maybe the guy who bought the last set of Eelco aluminum exhaust manifolds on ebay will chime on whether those melted in use.
Crawford
  ----- Original Message ----- 
  From: JVHRoberts at aol.com 
  To: crawfordrose at msn.com ; virtualvairs at corvair.org 
  Sent: Saturday, August 04, 2007 9:37 AM
  Subject: Re: <VV> Manifold heat soak


  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 
      To: crawfordrose at msn.com ; 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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