Originally Posted by dmhenderson (Post 2563019)

I'm not really sure whether this thread belongs in here or in the "body/exterior" forum but I figured I'd start here as I suspect I'm not alone. If a mod thinks this belongs elsewhere, please feel free to move it.

So unsurprisingly, I'm having radiant heat/heat soak issues especially when the car is pushed hard and I'm looking at more engine bay venting before I look into a bigger oil cooler/radiator/other cooling options whatever. I already have the vented fender liner from GTM so a hood scoop would be a nice way to get some air circulation going.

Thing is, I'm not crazy about the vented hood options I've seen posted here (carbon signal, seibon etc). I really don't like those diagonal vents as it kinda ruins the lines of the car - no offense intended, just my opinion.

I ran across this on my facebook feed (not my car):

http://i.imgur.com/XgYgGwe.jpg

...and it turns out this is a non-functional scoop - ugh. Is there a hood that looks like this or the old 350z vented hood style? I've been told modifying the stock hood (even with a fantastic metalworker) is a bad idea for several reasons.

Any ideas?

Originally Posted by synolimit (Post 2563203)

I wouldn't do a scoop only because I think a vent is better. Instead on bringing in ambient temps into the engine bay, I'd want the heat to get out of the engine bay faster/better.

Originally Posted by Chuck33079 (Post 2563045)

Some NACA ducts like the gtr would work if we knew where to put them. I'm not convinced any of the aftermarket hood makers have done any more testing beyond "the vent looks cool right there". I'd hate to put the vent in the wrong place and make the situation worse.

Originally Posted by Chuck33079 (Post 2563112)

Sure, you could have a good shop make some kind of scoop. I think the one in the pic is too far back. My guess is that the best solution from a function standpoint would be a vent with an extractor/louvers in front of the motor to give the air coming out the back of the radiator a place to go.

Originally Posted by dmhenderson (Post 2563195)

I like that concept and placement but I still think I'd want a scoop or something on top of that so that if I get caught in weather, the engine bay isn't directly exposed.

Originally Posted by dmhenderson (Post 2563210)

Well, I'd be leery about having the engine bay directly exposed to weather/debris/whatever even with that mesh there. I think I'd feel better with a combination of scoop/mesh.

Also, with my vented fender liners, a scoop would generate air circulation where a hole in the hood covered with mesh might not. Not an expert here or anything but I think I'll give my guys at D&V a call and see what they think.

Originally Posted by Chuck33079 (Post 2563234)

The fender vents aren't going to address the main issue, which is getting the hot air passing out of the intercooler/radiator out of the engine bay. The only thing the fender vent does is give the air exiting your oil cooler a place to go.

Originally Posted by Chuck33079 (Post 2563227)

The problem on the Z is how little room there is between the motor and radiator. The air almost has to make a 90 degree turn to go out a vent placed there on the hood. A deflector on the timing cover to split the airflow to either side and two vents basically over where the intake pipes run may be more useful. Until we get some guys willing to tape yarn all over their hoods to check airflow at speed, we're just guessing.

Originally Posted by dmhenderson (Post 2563237)

yeah that's what I was thinking. Scoop forcing air downward over the engine means better airflow over the oil cooler and out the fender vents. That said, I'm not sure it would actually work but it would make sense.

Originally Posted by Chuck33079 (Post 2563238)

Maybe some kind of extractor setup on the under panel? Bring the air out the bottom?

Originally Posted by synolimit (Post 2563240)

Doesn't matter, it works same way the air hits the motor and has to 90* down under the car. Airs light, it can change direction fast just like a stillen CAI bends. Heat rises and the hot air hitting the engine has no place to go but up or down and under the car. Both of which get the heat moving and out with a properly placed vent. And I did the yarn test on mine.