The vent on the hood acts as a suction when moving to remove the heat from under the hood. The technical term is called "The Venturi Effect" Look it up, it will explain it.
The vent does remove alot of the heat from under the hood, but not all of it. The HKS suction Intake or any aftermarket intake will get hot even if you have been driving on the highway for awhile. Just pop your hood and feel the filter, its pretty hot.
I utilized a makeshift snorkel "airduct" that pulls cool air from the lower airdam "bottom side below the drivers headlight" it acts as an air funnel, And supplys cool air directly to the filter, It works very very very good. The intake no longer gets hot, it stays as cool as a crisp winter day, Even the aluminum pipe stays cool. It only took minutes to install and was very easy. Here are the pics. And it fit in there without crimping the air duct. The part is available at any auto store. I think it cost 6 dollars, and you will need two zip ties.
I tested the airflow through the snorkel before I installed it, I put one end out the window while driving on the highway, and let me tell you its like a leaf blower, and no matter how you twist or curve the snorkel it did not loose any of its flowing capabilities.

 

That really looks cool...literally and figuratively.

 

uhm... the venturi effect is the fluid dynamics sceneario where a fluid goes from a larger diameter channel to a smaller diameter channel hence producing an increase in fluid velocity producing a pressure drop in subsonic flow.

the vent in teh hood is just lcoated in a low pressure area of flow over the car... this draw out air from the engine which can then draw in air from the high pressure area in the front of the car.

that said your intake tube thingie is a better example of the venturi effect... altho even that is less than an ideal case.

also evodave has a kit for these thingies and includes a velocity stack for the intake of the tube.

for more fluid dynamics available to the general public

http://en.wikipedia.org/wiki/Venturi_effect

 

Well its good to see you looked it up, But its all the same thing. The venturi effect is used in multiple aspects, Vehicle aerodynamics, ventilation, blood flow, combustion engines ect....ect... ect...
Venturi Effect -- The speedup of air through a constriction due to the pressure rise on the upwind side of the constriction and the pressure drop on the downwind side as the air diverges to leave the constriction.
It does not matter if its fluid or air, its all the same thing.
Nice try though. I am still right. And so are you, just in part though.
Oh and one more thing V-E-N-T-uri Effect, Notice the word VENT, as in ventilation.

 

hmm i havent noticed my HKS getting hot at all.. But i removed the vent from the hood.. Maybe ill go for a spirited drive and feel the pipe / filter..
I had this mod on my srt4. Cut a hole in the bottom of the air box with the vent running to it from the removed fog light.

 

There are also Venturi valves used to produce vacuum I use them all the time.

 

evodave is a god at headlight mods...altough a real version of this was and is in production...i had the JAP-EVO catalog...all the parts that are coming out to the U.S have been out there in Japan, the headlight with the vent cut out where the fog/high beam are exist...and it was $600 USC...i guess EVODAVE's is cheaper....but the original is definatly worth 600 evo daves has no screen i think last time i checked....the original had a super fine mesh...that only alowed air trough...evodaves looks like its a hole "CUT/OUT" i think its still a prototype...he might b considering a finer mesh after my post...or its been in his head already...i think the original...the actual mesh...IS THE AIR FILTER!!...the rest is just a tube that conects straight to the MAF...to lazy now...or else id search for the original JAP product

 

The only problem with those are is there is nothing to channel the air into vent. Pressure builds up at the front and will bubble over, its kinda hard to explain. Now if the intake was connected to the back of the vent it would suck air into it. But just because you put a hole in a headlight does not mean the air will channel through it, Granted some air will pass through but not enough to make a difference. Now if you remove the entire headlight that will work. Utilizing the lower air dam that channels air at a higher pressure is where you can gain alot of air flow.

 

the other thing is....sure its an add on...but we are already forcing air....via turbine....we dont really need hard pipe kits like other cars do "RAM"...a drop in filter "stock box" works fine....my two cents..i also had the hks racing suction kit...i loved how the turbine did start spooling earlier than stock...and it also sounded beautifull...damn thing made music to my ears...a nice whisltle....anyway i got rid of it and i now like the drop in...my buddy has an STI with a GT35 kit and damn his waste gate screams "screetches" [spelling?] anyway yeah screams when it opens the whole damn run..ill try to get some clips

 

Thats a nice $6 mod. Its wierd though that your intake was getting hot? I've never heard of that before. I'm assuming that the hose was cheap and its looks pretty quality. I'd like to make myself some brake cooling ducts with that kind of hose for my EVO. Which auto store did you go to?

 

umm, if you drive the car....everything under the hood gets got. you ever tried to grap the hood prop rod after some spirited driving? MFer will burn a hole in your finger.

anything to get cooler air in the engine bay will help, especially if it is hitting directly on the air filter.

 

the only concern I have is wet weather driving, having rain and road mist getting carried through the tube and getting the filter soaked. I had a cai once that would bog the car out when the filter got wet enough

 

A lot of racers do this. I logged a couple degrees cooler intake temperature when I did this on my gsx at the tracks. But anyway, evodave did a headlight mod where he put a hole in his foglights. it'll probably work better and looks okay.

 

uh... air is fluid... i used the more generalizing term.

speed up of air through a constriction! the hood of a car receiving flow over it isn't necessarily a constriction. in fact in that type of scenario it's NOT a constriction but the UNconstricted part of the system where the constricted system is the air in the air dam at the front of the car. in this case it's just a general application of the bernouli equations.

venturi describes flow THROUGH something. and yes it does describe the pressure rise and drop and hence velocity drop and rise.

 

https://www.evolutionm.net/forums/sh...highlight=duct