Jerry Hey wrote:

Paul,  I want to drop a 2.25inch  o.d. section of tube into the S-beam
to allow direct air flow into the cool tube. The tube i.d should allow
a piece of 2" scat to run through it.   I think if this is done
properly, the  s-beam's integrity will be enhanced, certainly not
weakened in any way.  By properly, I mean the hole cut in the S-beam
would provide a tight fit around the tube, the tube would be either
4130 or 304 SS.  It would be Tig'd into the s beam. I will build a
prototype so we can prove its strength.      Your thoughts?    Jerry

That would probably be OK. Max stress on the beam is in by the mounting
bolts. I would stick to 4130. No telling what can of
worms you might get into by welding stainless to 4130.

Paul Lamar

Good on the structure.  I and many others  have been welding 304 SS to
4130 for a long time.  No problem at all.  Just be sure to use 304 rod.
   That is TIG welding of course.    Jerry

Jerry Hey wrote:

Here is a photo of what I have in mind.  The tube is 2.75 o.d. mild
steel exhaust tubing because that is what was laying around but I bet
it is more than adequate.  I have not found the same size in 4130.  It
is available in 304.   I just want a large enough hole to feed a
section of scat through.       Jerry

Not exhaust tubing. The top flanges are in compression. Exhaust tubing will
collapse. You need at least 1/8 thick wall tubing here or better yet box it in up
over top of the tube. You should also static test it by turning it upside
down and hanging 900 pounds off it at the motor mount.

What is the matter with the S bend? Two 45 bends back to back will clear the
beam. I did a 3D on this  awhile back but I can't find it. You need to trim
the tube going into the muffler flush with the front face of the muffler 
to get enough room for the S bend.

Paul Lamar
 
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