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Granted, Poiseuille's Law or equation was meant for (non-ideal) non-compressible, laminar, FLUID dyamics, and therefore does not directly apply to gases. Also, the Law does not take into account pipe bends. But there is still a powerful take home message - Flow is proportional to the FOURTH power of the radius. In other words, small increases in pipe radius yield great improvements in flow. For example, with all other variables being constant in the equation, a radius increase from 2 to 3 (a 50% increase in radius) would yield over a 500% increase in flow! I am not a physicist and my point could be torn to shreds by one, but the broad strokes are there - small differences in diameter of piping yield greater than would be intuitively expected changes in flow, especially when dealing with the sizes of piping and tubing in our performance applications.
"Straight-line acceleration is probably the first aspect of
automotive performance that any intelligent driver gets bored with."
Peter Gregg "We owe a lot to the dragsters. They always break something,
figure out a way to beef up the part and then the benefit trickles
down."
Robo "Not everything that can be counted counts. Not everything that
counts can be counted." Einstein
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