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Old 02-09-2018, 12:46 AM   #53 (permalink)
freebeard
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When all four cylinders are sucking through the venturi, there will be skin friction all along the path. A restriction at 1/4th" of that path prolly has less effect than the skin friction throughout the full length.

The mass of air will speed up locally, suffer a lot of turbulence and then slow down again.
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