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Message: <blockquote data-quote="ttocs" data-source="post: 903053" data-attributes="member: 11896">please do not think I am arguing to calling you wrong, I am debating and learning.  Venturi effect(for air) means passing air across a small tube/opening, which has a much larger cavity and opening behind it.  For this example I do not think the heat extractor hood would count as the opening in the grill and the extractor are almost the same size so the only air out of it will be heat rising when standing still and when moving if the air is pushed from the grill(as your example shows).  The venturi effect would be more for the stock hood.  The two little holes on top open up to a large hole on the bottom under the hood blanket(which would restrict it).  When driving and air is passed across those holes they creat a low pressure area inside the hood that will suck the heat out from the larger hole underneath.   You see this cooling used often on prop planes as or even on rc airplanes where there will be a hole on the bottom of the cowl covering the motor to draw heat out.  you can prove this works like I said above with just a straw and some liquid.  Cut the straw not completely in half but so that you can bend it into a 90 degree angle.  Now put the straw in some liquid while still at 90 degrees and blow through the one piece, across the piece that is in the liquid.  When doing this the low pressure will cause the liquid to suck up into the straw above the water level.  make any sence?  Again just playing devils advocate to learn a little bit.  I am an electronics person and by no means a rocket surgon so....</blockquote>