Hi, Bruce. I was reading your reply about restrictions to the cat and
differences in velocities between a 2.5" and 3". You had stated that
velocity slows when there is a restriction (like a smaller pipe). From
my days in mechanical engineering in college, the continuity equation
says that, if flow is the same, velocity INCREASES when there is a
reduction in area. This is the equation where A1v1 = A2v2. By
reducing the area, velocity goes up. You have a good point about the
boundary layer on the surface of the pipe. I guess you're talking
about friction loss and the resulting energy that the high velocity
air in the pipe loses.
Watching your velocity in the pipe is important for tuning an engine,
as I'm sure you'd agree. Scavenging can help produce more hp.
I'm not trying to flame anybody, but just bringing up some engineering
rules that are ever-present when working with fluid dynamics. Thanks
for the time.
Chad Niwranski
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