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My Armchair Experts Opinion....
1. You are likely to make a very loud intake system with this idea. This may not be a concern.
2. You pretty much eliminate the Hemholtz style tuning system unless you have some continuous length 'column of air' that is the same cross sectional area. The way it works is you have a vibrating mass of air due to the volume of air contained in the 'restricted cross sectional area' portion. The momentum of this 'mass of air' is where we gain the benefit, as it allows more flow into the chamber because of its momentum. With a continuously varied cross sectional area, you would have no tuned mass, therefore no momentum of this 'column of air.'
3. Velocity stacks are there to guide flow. Think of it this way.... atmospheric air has little momentum (within the controlled environment of this theory), and the tuned column of air in your Hemholtz style intake system has its momentum. So you have a problem of a high energy vibrating air mass at the tip of your column interacting with normal atmospheric air. The tip of your column of air will cause all kinds of pressures and reflections and refractions and all this will impede flow. The bell end of the intake acts to guide the air and allow it to work across this transition.
4. I think there would be no problem in longer, larger bell ends, but if you eliminate the tuned continuous cross sectional area column of air, then you are not using Hemholtz theories of tuned systems, and who knows what would happen.
5. I think carbon fiber is fine for intake systems, as long as the materials can resist direct contact with fuel. I'm talking about the P part in FRP. (Fiber Reinforced Plastic)
Jeff
p.s. this advice is worth exactly what you pay for it....
On Jul 14, 2009, at 8:33 PM, Ben Schneider wrote:
Fellows,
I have been thinking up this crazy idea of trying to make intake runner tubes out of carbon fiber. My question is regarding length of the velocity stack. Does the length make a difference? Could a velocity stack be more or less the entire length of the tube? Meaning, if I have a 12" intake tube, could the entire length of the tube be a gradual taper to the diameter of the block opening? Would that mess with the speed the air is traveling in the tube? Aerodynamics is not something I have a very good handle on, and am hoping someone out there in Fly Rotary land can shed some light.
Toughts???
BTW, Any reasons why carbon fiber should not be used for intake tubes? May make the velocity tubes a mute point.
Thanks for any thoughts.
Ben Schneider
P.S. Any Fly Rotary fellows going to OSH??? Perhaps a lunch one day or something.
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