Originally Posted by downwardspiral
The way I see it, all the air would be at 14.6 psia but the velocity of the air would be higher. The only way the pressure would increase would be if something closed the system, and pushed the air forward while the other end was blocked. The air is not going to be compressed, there is no nozzle effect as the diameter of the pipe is constant, but the oxygen molecules will be there when you need them (intake stroke). In a carburated car, where air is drawn through the grille, through the radiator and into the air filter... It makes alot more sense to draw the air through the hood to keep temperatures low and velocities high. In a fuel injected car, the stock airbox is designed in the spirit of "ram air", in the form of a remote inlet.
If you put a 3.0" elbow pipe out the window and pipe in about 2 feet of 3.0" PVC tubing you get air to flow thru the pipe. Agreed?
If you cap off the end with a smaller hole in the cap, you will get air to flow thru the hole. Right?
The only reason air would pass thru that hole is because it has a higher pressure than the air in the cabin. The assumpton can be made that the air in the tubing is under pressure. Otherwise the air in the tubing has no reason to pass thru the hole.
It can also be assumed the continuios the ram effect will maintain that increased pressure.
So long as the volume of air collected is greater than the volume of air consumed, the intake should have positive pressure. This is a function of the size of the collector orfice.
So now you have more air coming into the TB with increased pressure. Is that not how mechanical compression systems work?
roadster with a stick