snips

Why not one straight piece guys. A lot less work. You might find some
stock .049 SS tubing.
Does not have to be 321. 304 or some other SS would work here. Make
your life simple.
If not rectangular get round and squish it between metal plates in a
hyd
press to oval. I can give you a flat cutout pattern where the tube
intersects
the six inch round can.

http://www.tubemethods.com/

Paul Lamar

It the drawing, you had to move the exhaust pipe outboard on  muffler
which I don't want to do  at least not until we have had a chance to
gain  more practical experience. I want the exhaust gases to hang
around a bit losing speed and temp.  The further outboard the pipe,
the
sooner the gases will exit.  Of course, this is just a wild ass guess
on my part.  Who knows?     Also, the pipe seems to be growing in
size.
 The 4 x 1.75 inch is more than adequate. Lastly,  I really like the
trick appearance and moldability of the rectangular exhaust pipe.  But
of course,  if  your are just running the straight pipe down at 45
degrees, a crushed round pipe could be used.  You need a three inch
round pipe and  you can't crush it very much without making it too
small.     Jerry

Jerry Hey
j-winddesigns@thegrid.net

I don't think anything else will clear Jerry. I also think it will be
hard
to measure a difference in noise. They are all 1.75" by 4 inches.
If you scale them  you will see it is an optical illusion.

It is up to you. I can probably design a spaghetti down pipe that you
can't
or won't build  build :) How about a rectangular down pipe with a 90
degree twist?

Start with a 5 inch round pipe and when you crush it it will come out
to roughly the right area. Of course it is hard to find 5 inch .049
thick.
Maybe .063 but I doubt it.

BTW a 4 inch by 1.75 .063 thick pipe 20" long will weigh 4.3 pounds.
.049 thick would weigh  3.3 pounds.

Paul Lamar

One pound only!  I rest my case.  Jerry

Did I make a mistake? Lets see a 4" inch by 1.75" rectangular tube un rolled is
11.5 inches wide. By 20 inches long is 230 square inches. By .063
thick is 14.49 cubic inches. Since steel is .3 pounds per cubic inch
then that is 4.347 pounds. Where did you get one pound?

Paul Lamar

I suspect Jerry is refering to one pound difference in weight -- 3.3 vs
4.3 as stated above.  BTW - Mark and I are waiting with baited breath
for our engine mount to arrive.  I think it is cruel & unusual
punishment for Jerry to post pictures of it (The Mustang II mount) to
the group before we even get it! ;-)

Mark & Mark

BTW If anybody has a scrap housing of any kind send it to Jerry. If enough
of us donate just one housing each he will soon have enough for a complete
mock up. 

BTW Jerry you could always weld up a phony 13B from sheet steel.

Paul Lamar
 
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