Thanks Lynn,  Paul's Tailwind Motor Mount design is about as good as
 it can get in my opinion.  The same layout works for RV's too.  I
 principle that I am hoping will work in my muffler is that the
 exhaust note will be softened by  turbulence.  The exhaust pipes
 enter the four inch sq pipe perpendicular to the long axis.  The
 exhaust gas, I hope, will  bounce off the far wall of the muffler and
 not get that reorganized as it flows out of the system.   The muffler
 will be in two pieces that bolt together  at the 45º turn down.  If
 version number one is too noisy, then I can make different end
 pieces.   I think a home made version of Spin Tech could be a bolt on
 option.  Issues such as clearing heat from inside the cowl, not
 having the muffler in the air stream, keeping the exhaust system away
 from the radiator and oil pan are all at play in this design.  Lack
 of space forces compromises throughout.   Jerry

I think your muffler might work real well. We have never tried a square
can. That might break up the sound waves with all sorts of bouncing
around in there.

BTW does this look about right? I'll add the muffler and rad soon.
What size rad are you going to use? Where would you like the inlet
and out let?

Paul Lamar

I was just about to ask you to look at my  installation in Rhino if
you have the time.  My radiator's outside measurements are  13" x 22"
x 2.75".  (Core size is 594 cu.in.)  The radiator will be displaced
to the right to get away from the muffler.  Looking at it from the
front, the Barry Mount centers are 20.5" apart.  The radiator  will
be 1.5 to 3" inside the right Barry Mount.  Lots of small variables
that can move it one way or the other within that range.

  The exhaust pipes extend out about 9 inches (this is to the outside
of the down tube) before doing a 90º straight down.  They go around
and underneath the frame to connect to the muffler.  Final connection
is by 4" long flex tubes that will be clamped not welded.    As the
exhaust pipes come out from the engine they go from 5.5" centers down
to 4" centers to clear the upper Motor Mount tube.  Four inches is
maintained all the way to the muffler.   The muffler is 3" or 3.5" sq
SS.  It is not four inches.  What I wrote above was a mistake.

Any chance you could portray my PP intake manifold?   I would love to
see how it will look.  Thanks,   Jerry

Sure I can do a PP manifold. Will do.

This is 45 degrees down right out of the flange and then straight.

If I bring the pipe out straight it runs
into the tube.  I have 45 degree bends and 90 degree bends.
Or I can make anything you want :-) These bends are four inch center
line radius but I can make 5 inch if you think it is important.
It gets expensive if you have to buy them.

What do you want to do?

Now you know why I put my rubber bushings 29 inches
center to center :-)

Paul Lamar
 
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