Quote:
Originally Posted by some_other_dave
One of the fun parts with that equation is that exhaust gas is HOT. And it cools relatively rapidly as it moves through the exhaust system. So its density changes by a decent amount...
-soD
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Which leads to a considerable amount of head scratching by designers of high performance exhaust manifolds(headers). It gets so complex that most designers just give up on calculations and develop the diameters and lengths experimentally on an engine dynamometer. Throw in stepped diameters and the problem becomes totally intractable.
