Subject: Re: 30 dollar 12HP+ air foil? by anesthes on 2009/12/10 19:39:47
Quote:
jhammons01 wrote: From my Vacuum pump/Airflow days.....the amount of airflow is dictated by the smallest orifice.
It makes no difference what you have upstream in calculating conductance, the smallest orifice conductance is the MOST you'll get through that system.
And what is an Internal Combustion Engine?? A large vacuum pump.....
Now if you get into fluid dynamics and intake runners lengths calculated to maximize a "wave" created by valves opening and closing...that is another subject....
But stating that the shape of an opening flange not effected by fluid dynamics will make a difference...that is pure BS.
And as a matter of fact, Length of the inlet piping will IMPEDE conductance.
Look at this way, you have a flange that is sucking in air.....The more tubing you place on that flange, the less conductance will be.....if you place a bend in the inlet pipe...now it is worse.
In the vacuum industry, the Flow of the vacuum pump is always measured with the Pump mounted directly......in other words with no restrictions from any plumbing. So when you look at vacuum pump specs, you know that....e.g. you have a 10CFM pump......If you start that pump up while it is sitting on the floor...it will pump 10CFM.....but once you hook it your system....it will be something less than 10cfm......the diameter, length, the amount of bends...the radius of the bends all are needed for calculating what that CFM will be......Upstream or downstream pressure IS NOT CALCULATED AS IT MAKES NO DIFFERENCE. The CFM is what is no matter.....
So now, back to that little mod.....does it not seem like it is lengthening the amount of travel of that inlet? So based on what I posted (physical properties), would it not seem that actually opening or shortening the opening do more to enhance the CFM of that inlet? That thing increases the length......
Just saved you $30
You missed the whole tech behind it.
Look at the stock throttle body opening.
What happens when positively charged air hits the cavity and bounces back?
Like I said. useful on blower applications. Not as useful on stock applications. Also useful on ram air applications.
It won't add 12hp to a stock C4.
I wouldn't put one of these on a majority of cars on the forum. For my blower builds, If I'm using a twin bore throttle body (which I'd rather not to begin with) I would use an airfoil. Want to know why? Because when running two boost gauges, I'll have WAY more boost in the intake tube before the throttle body than the manifold on the motor that doesn't have the airfoil.. Guess what that means??
