05-02-2014, 09:20 PM
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CC Member
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Join Date: Aug 2009
Cobra Make, Engine:
Posts: 105
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Great info Mr. E!
Some of the terms in your post certainly bring back the memories (a.k.a. nightmares) of the predictability, or perhaps unpredictability of fluid flow. I was indeed curious as to what could be considered as the "effective" diameter with the louvers in place. Something else that I was just thinking about is how exhaust flow is actually a pulsating flow instead of a steady, constant velocity flow as is typically dealt with, and then the pulse frequency changes with RPM, which only further complicates things for exhaust designers. 
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If a man does not keep pace with his companions, perhaps it is because he hears a different rumble. Let him step to the sidepipes which he hears, however measured or far away. - H.D. Thoreau...if he had owned a Cobra
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