Al Gietzen wrote:

I have an inconel tangential manifold/muffler on my 20 - photo attached (made by Mark (can't
remember last name), a la David Atkins).  The inconel tubes extend through the heavy Racing Beat
Flange, but are welded on the outside - not on the inside.  Although having the tubes go through
the flange may have made the welding easier, I'd guess that once you get that weld bead around
there the resulting strength is no better then butting it up and wleding it.  Seems it should be
welded on the inside end so the flange can support the loads on the tube.  There obviously will be
significant thermal stress set up and the unit expands and the engine doesn't.

Atkins has the same approach on his 13B and it seems to be fine.  The distance between the ports
is much less on his.  Am I worried about mine?  Yep.  Short redoing a very expensive piece, I'll
do frequent inspections.

Al Gietzen

No photo was attached Al. BTW if you turn off your html your messages will print
better.

Paul Lamar
 
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