Does anyone have a good source for design and fabrication of headers for
the
 rotary? I want to use 321 stainless X .065 wall at the inlet but what
 practices should be observed as far as slip joint construction?  Do you
 expand the tube to fit over the same size?  Do you purchase different size
 tubes that telescope? What is the preferred design of the slip joint? Is
 wall thickness
 maintained throughout the length? Thanks for any help

 Joe Berki
 Limo EZ

 One can get tube expanders to make slip joints.
 Flanges are available from Racing Beat and Mazdatrix.
 JC Whitney and or Warshawsky has SS muffler parts.


 I would use .065" thick for the first couple of feet
 and then go down to .049" thick.
 Depending on the design.

 I have a good fabricator on SS. Let me know what you want
 and I'll do a dwg.

 He has already built one muffler for me. He follows dwgs
 and does not try to design it himself.

 Paul Lamar.


Paul,

Thanks for the pics.  That is almost what is needed for my installation.
Where the first 90 degree bends are they should be replaced with 45s and
where the second set of 90s are the pipes will go up instead of straight
ahead.  I have the flange but it appears that it can only be welded from the
outside.  There is a step that the tube bottoms into.

Joe Berki
Limo EZ

Take a close up picture of that flange. You may be able to turn
it over and swage the tube in there. That would be ideal as there
is no welding heat affected zone. When stainless steel is welded
some of the alloys in the metal are forced out changing the
strength near the weld area. This makes it more prone to cracking
and rusting for that matter.

This airplane crashed when the exhaust pipe cracked in the welded heat
affected zone. Also the exhaust pipe was wrapped with high
temperature fabric retaining the heat. A real no no.


Paul Lamar