J-Mech; I suspect the pipe diameter was incorrect for the motor. on our pro/super 50.5 motors we run 1 5/8 or 1 3/4 depending on a few things. I used 1 3/8 on this one, a .010 over -16 at 4000 rpm . I'd bet if the pipe size were 1 1/4 or 1 1/16 it would do nothing , probably hurt it. that's why it was so sensitive to the length when I cut it off .
I think (and I'm no rocket scientist) and your somewhat correct . a good or proper sized exhaust the hot exhaust gas's start to speed up as they try to expand and leave the pipe . torque is created by filling the cylinder better. Make sense?
Sam Mac; they are a thing of beauty , I've been studying those pipes for a couple months now looking for a specific design that was used at the cylinder head that I'd like to copy to one of our open rpm motors.
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