Edward Klepeis wrote:
Dear Paul
Your easy tangential muffler looks good but there is one
problem.On
a motor mount like jerrys it wouldn't fit. I had approx. 1''
clearance between mount tubes and exhaust tubes all around top,
bottom,and side. Also you would have to rotate the can upwards to
clear motor mount tubes putting the top tube closer to the intake I
don't think that is a good idea.As it is jerry and I are talking
about putting some kind of heat shield between the top of the
exhaust and the bottom of the intake to take some of the heat off
the intake. I'm open for ideas.
Regards
Ed
That why you might have to use the P51 side beam type mount so all
MM tubes go UNDER the muffler. Most cowls are about 40 inches wide
so half of the engine is about six inches. This muffler is about
ten inches OD. That gives a total 16 inches out from the center
line plus an inch or two. That leaves in theory about two to four
inches of cowl clearance. Some cowls are even wider than 40 inches.
It obviously will not work on a tandem RV4 or RV3. I might
work on a tandem RV8 as they use the same cowl side by side airplanes
use. Here is a 3D of the P51 type side beam MM.
A slightly smaller OD version of this muffler could be made if you
used 1-3/4 inch OD tube bent up on a 3 inch center line radius with a
smaller center can. that would give you a 4-1/4 diameter center can.
Over all would be 7-3/4 inch diameter.
Paul Lamar
Paul,
You have the exhaust tubes jammed right next to the intake manifold.
That dosen't look like a very good idea. That will put a lot of heat
into the intke manifold.
Bob White
--
http://www.bob-white.com
N93BD - Rotary Powered BD-4 (soon)
You are absolutely right. I took another look and it won't work
with Jerry's P-Ports. At least I am almost 100% sure about that.
Here are some more 3D's using Jerry's P-port setup and the current box
Schertz beam. I moved the can down 2 inches with S bends in the exhaust
pipes and spiraled both tubes outward and lengthened the center can. It
still interferes with Jerry's P-port.
Ignore the green MM tube going through the muffler as that can
be fixed with a P51 side beam beam type mount
I have one other idea I am thinking of trying.
I will also do a 1-3/4 inch diameter exhaust tube version and see
how that fits with Jerry's P-ports.
It will work with the RX7 Turbo II side port manifold and
my side port manifold. The RX7 Turbo II turbo is just as close
to the intake manifold as this muffler is.
Paul Lamar
OK I redid it for 1-3/4 inch tubing bent up on a 3 inch center line radius
with a 4-1/4 inch diameter core can. Two parameters are affected.
One; the tube must be wrapped around the core for 405 degrees rather
than only 360 degrees. This becomes necessary to get the required
32 inch tuning length. Two; the smaller diameter can can be moved
outboard and down to give plenty of room for Jerry's P-ports.
I fixed the left side motor mount tube to clear the muffler in
this 3D by using a P51 side beam.
This should put a bit of negative pressure on the exhaust and
enhance the power of the p-port engine.
Paul Lamar
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