[AT] Hole in exhaust manifold....

[George Willer]

Al,

Walt should study more before he offers advice, we know he hasn't brazed a
manifold.  Visible red shows up just a little over 900 F.  An engine with
aluminum pistons would melt down long before the manifold got to 2000 even
with the cooling effect of the incoming charge.  

Copper/zinc (brass) melts at different points depending on the alloy.  The
range is from 1300 F to nearly 2000 F. The cast iron itself would melt at
around 2300 F.

Brazing manifolds isn't for the faint of heart... differential cooling
causes a lot of cracking... It's very difficult to do.  Ask me how I know.

George Willer

> -----Original Message-----
> From: at-bounces at lists.antique-tractor.com [mailto:at-
> bounces at lists.antique-tractor.com] On Behalf Of Al Jones
> Sent: Monday, January 29, 2007 6:21 PM
> To: 'Antique tractor email discussion group'
> Subject: RE: [AT] Hole in exhaust manifold....
> 
> If a manifold got to 2000 degrees, the pistons and associated parts of
> the engine would be in the process of, or already turned into, molten
> puddles.  Now it's been a while since I taught this stuff, but doesn't
> braise melt around 800?
> 
> Al
> 
> -----Original Message-----
> From: at-bounces at lists.antique-tractor.com
> [mailto:at-bounces at lists.antique-tractor.com] On Behalf Of John Kennedy
> Sent: Monday, January 29, 2007 12:39 PM
> To: at at lists.antique-tractor.com
> Subject: Re: [AT] Hole in exhaust manifold....
> 
> Exhaust manifolds can get hot enough to burn though cast iron why would
> anyone want to use something that can't stand heat above a few hundred
> degrees. I have personally seem some of mine red hot when run hard that
> is
> over 2000 degrees.  Like I said before either braise it or replace it.
> 
> 
> 
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