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Originally Posted by RBS14
So you're saying with a full radius stack that would deflect airflow above or below its opening upon entry into the plenum would over feed #1 but a design that shot air directly into cylinder #'s 1 and 2 wouldn't over feed them?.
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I didn't say that.
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Originally Posted by RBS14
The plenum doesn't taper for a good reason, because I want all of the stacks to have the same area of air above them and same proxemity to any walls so they can all get the same amount of air. If you just have runners going off the bottom of the plenum floor to the engine without any velocity stacks you need to reduce the possible amount of air each successive cylinder is getting because you will get losses on each cylinder as the air travels back. This is not the case with velocity stacks sitting above the floor
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Whats wrong with a tapered plenum? Tapered plenums (I call em cone shape) are made to evenly distribute the air flow to feed each cylinder. When you are running low boost or are spooling, tapered plenums work most effectively to allowing the engine to take what it need's until enough pressure builds in the system. Tapered plenums allow the molecules to spread evenly along plenum even during the point in time in which they compress in the plenum chamber during boost. You do need to realize though as pressure builds so does the effect of valve overlap, and scavaging.Increasing boost pressure only increase the momentum of the intake charge allowing for alot of o2 to pass right through past the intake and exhaust valves. So there really isn't 8PSI of boost pressure in the plenum, even if you run boost at 8PSI, air is constantly moving it's way through the cylinder and through the exhaust.
In your case it almost sounds as if you wanted to apply constant pressure to your plenum. That isn't the case as there is spool time to where the engine can infact consume more air than what is given from the turbo at low spool.
Since the dynamic of pressure is to look for the nearest closest exit (if you built a hallway and were trapped what door would you go through first) hopefully an easy analogy to understand.
Much appoligies Scott if you think I am trying to offend you, I only want to help in better your project.....