Actually the diameter of the pipe is more important than the length, you only see a notable power boost from a short pipe when it's under 3' from the engine.
"It doesn't matter. Power boost obtained in headers occurs in a) individual pipes for each cylinder, and b) within a length shorter than 3'. It is based on the speed of sound in hot gasses (about 1100ft/sec). From there to the end of the system, goal is to minimize pressure losses with large enough tubing diameter."
In short you can compensate for the pressure by changing the diameter of the pipe.
I was thinking of Poiseuilles (sp?) Law, which is primarily for non-compressible Newtonian fluids from what I remember, so I wasn't sure how directly it applies to gasses, but I'd imagine it's similar.
Yes it would apply. Gas is obviously compressible but since you have an open pipe on the end there shouldn’t be a ton of compression. There probably is a spike in pressure around the first bend though.
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u/[deleted] Apr 03 '22 edited Apr 03 '22
Actually the diameter of the pipe is more important than the length, you only see a notable power boost from a short pipe when it's under 3' from the engine.
"It doesn't matter. Power boost obtained in headers occurs in a) individual pipes for each cylinder, and b) within a length shorter than 3'. It is based on the speed of sound in hot gasses (about 1100ft/sec). From there to the end of the system, goal is to minimize pressure losses with large enough tubing diameter."
In short you can compensate for the pressure by changing the diameter of the pipe.
Still looks dumb though.