Don't know if this has been pointed out before (wouldn't doubt it has already) but this is a quick and easy way to help improve heat extraction from your hood vent. You can remove the louvered aluminum stamped piece by opening the hood and removing 4 plastic screws and 2 holding clips from its surround. It will drop out (put it carefully aside so you don't bend it) and then replace all the hardware to keep the heat shield in place. It makes it kinda cool cause you can see the engine bay thru the hood after See picture . . .

Not sure if I should get the louvered part Jet-Hot coated along with the exhaust heat shields. Anyone done that yet? Have pictures?

 

Very cool look, especially if you have colored hoses or intake pipes. Also it can't be bad to allow more heat to escape.

Cheers,
Winston

 

Well,

I'm not so sure that will really help cooling other than when the car is sitting still. I'm not sure how the actual airflow looks when the car is moving, and the lump infront of the cut out may already create a low pressure zone over the opening...

But in general the louvers create a low pressure zone on the trailing edge to help pull more air through.

Someone correct me if I'm wrong about that please....

 

My understanding of aerodynamics shows it is pretty simple. The air moving over the hood (equal to whatever speed you are going) will create a low pressure zone relative to the air in the engine bay (which is not moving or may even be under positive pressure from frontal inflow). The air under the hood will get sucked out analogous to the smoke from a cigarette being sucked out the cockpit of your car thru the side window open or even cracked open a bit.
The louvres in that metal part have nothing to do with anything other than styling!! Who cares which way they face. The more structure in the way of the hood cut-out, the less the flow will be. The purpose of that piece is probably just to keep rainwater from getting in there when parked and for looks.
Just my 2 cents . . . .

 

Have you noticed the car running any cooler? Temp wise.

 

It's look good, but I think I will keep it in place. If you running an open air intake, the chances of getting water to the intake increases. So the chances of getting the engine ruined also increased.
i.e. A splash from other car can get easily get into your engine bay, probably air filter.

 

NO, I don't think that will cool the car more........Infact it is designed to extract more heat with the fins on......This has been covered by the Evo technicians at the introductions of the Evos when it first came out.

Sitting still, yes, I can see that without the extractor heat dissipates more but while moving, no.......Because the fins serves as a ramp for the air......When the air hits that ramp, the speed of air travels that much faster blowing the hot air from the engine away from the hood area as fast as possible.......

 

I'm not going to argue the details, so let's just make an observation which can be the third party. Has anyone seen or have pictures that show the configuration of the actual Evo rally car? I have not, but I think there is likelihood that they run without this "glitzy" piece in place. If it truly helps then they will have the louvre piece in use . . .

Can't tell in this picture for sure, but looks like you can see the cam cover in a few thru the opening . . .

 

Check out this picture--I see cam covers thru the hoods! But what do these guys care about cooling . . .

Decide for yourself. Don't believe everything you hear--even if it comes from some supposed "tech"

Cheers,

 

The hood design is to help with heat expulsion and improve aerodynamic efficiency, this is according to Mitsu motors (stated on the official web site). Maybe the vents are there mostly to reduce front end lift and/or add down force and to help with heat expulsion. I guess everybody has the right idea about this.

Cheers,
Winston

 

The only concern I'd have would be water and/or dirt/etc. getting into the engine bay. Otherwise it seems like it probably allows for the aux. cooling fan to push more air out through the hood opening.

AV8NDOC, have you put your hand over the vent while the aux fan was running to see if more air is flowing out?

 

No, and I don't plan to cause the answer is pretty clear to me.
Sure more dirt and rain can get in without the cover piece, but then don't you keep your car clean and in the garage?


I only set out to show the trick. I don't care if you want to do it or not. Maybe if I opened a business and paid someone a lot to advertize for me then it would give me instant credibility. Then I could charge you to do the mod for you

And about the intakes, yes if you are dumb enough to remove the perfectly good factory cold air intake for something that will not give you more juice then yes you should worry more about water getting into it I guess.

Cheers.

 

Whoa, settle down Beavis. I was just asking a simple question. If you want to know if the open-air vent is going to actually vent more air, turn on your car and let it idle until the aux fan kicks in. Then see how much air it pushes out of the vent. Simple no?

Your opinions on intakes are irrelevant to this thread btw.

 

Oh and btw I don't have a garage, and I'm talking about when you're driving places (like in the rain, snow, etc.), not parked.

 

No problem.

Problem is I am answering multiple replies at once.
I did NOT bring up the intake stuff, just answering someone else (though with opinion attached).

It really doesn't matter much when you are stopped, so I will never check about aux fans. It's the aerodynaimsc of motion that make the vent work. And it's the overall aerodynamics of the slipstream that will rule over any meager boundary layer crap supposed to happen in miniscule at each little louvre.

Just look at the REAL race car. . . I'll just quit now--really it's simple aerodynamics.