Jerry Hey wrote:

Paul,  as  you would expect,  253MA is fairly  expensive in sheet form.
  It costs $5.59 per lb.  The thinnest material readily available is
.059."  A  48" x 96" sheet is 99 lbs.   One sheet  would make  a number
of  complete  exhaust systems.   One could limit the use of 253MA to
just the header.  The rest of the system could be 321.  It would last
forever.   Once  you accept making the exhaust from sheet, the square
tube design is easier to fabricate than the round one, I think.

   We need to develop the ability to roll sheet into round exhaust tubes
including sweeps.    I have seen  pictures of some beautiful old Indy
race cars  with hand formed stainless exhausts that are works of art.
Any one out there know how to do this? Ed?

   I could not get a price on tubing which has to be special ordered.
Jerry

Jerry Bass wrote:

When my son and I raced Go Karts, the  4130 steel pipes were made of 
flat steel Trapazoides welded into tubes with turns and expansions etc.

The pipes had "trombones" that the driver pulled a string to change 
the tune on the pipe to match the engine rpm.  On Two cycle engines 
it was important to put the pressure wave at the exhaust port to 
hold the charge inside the combustion chamber.

Jerry Bass
540-932 3124

 
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