Subject: Exhaust radius
From: Rotary Engine
Date: 4/25/2008, 4:54 PM
To: AAA Put this in the To box

Easy question, lazy questioner.

What is the minimum radius of exhaust bend that won’t effect tuning?

Decker, Michael


Good question. I don't know the answer. Most people using tubing
bends which are about 2.5 inch center line radius minimum as I recall.

http://www.burnsstainless.com/321tubing/Ubends321/ubends321.html

The stock manifolds are sharper bends. Particularly the turbo manifolds.

-- 
Paul Lamar ...No rotor no motor.


STRAIGHT.  Anything resistance whatsoever in the exhaust flow will
affect tuning. In fact, putting even a straight tube will affect tuning,
compared to just letting it blast out unconfined.

However, the Wankel gives a much smoother exhaust flow in the first
place, so there's room to play.  You might make a water stack and try
some flex tubing and see where you start getting some back pressure.

I think the reason for the 2.5 bends is that the benders most people use
were made for thicker steel pipe, and 2.5 is about as small as those are
bent.  If they need a tighter bend, they just use an elbow.

Keith W


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