[AT] Hole in exhaust manifold....

[Al Jones]

Thanks, George, It's been a while since I had to remember temp. for
brazing, soldering, and so forth.  I've never been too good at
brazing--seems like I never got things hot enough to make it flow right.
Just need more practice I guess.

Al

-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of George Willer
Sent: Monday, January 29, 2007 7:30 PM
To: 'Antique tractor email discussion group'
Subject: RE: [AT] Hole in exhaust manifold....

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