Douglas Fir wrote:

Paul

I noticed a lot of posts recently about tuning intakes.  I assume the same
is true for exhausts.  If the angled  outlet pipe of tangential muffler
Jerry is making has the exhaust pipe sticking out in the slip stream I
believe it should exhibit a slight vacuum thereby helping to draw out the
exhaust better.  Turbo props exhausts take advantage (need to) have this
design.

Q. If this vacuum phenomenon is maximized does it alleviate the need for
tuned exhausts?

Seems hard to calculate the tuning on how gases travel in a large chamber.

Doug in Japan

They are a big unknown. Hope to measure the pressure when I get my dyno
going. Everett Hatch maintained the optimum length for two individual pipes
was 32 inches. Most of the headers that Racing Beat sells are about this
length. The speed of sound varies from the intake manifold due to the heat
of the exhaust gases.


Paul Lamar
 
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