Road Race Engineering hood vent

[smellmyface686]

Yea i was actually looking at mine on top of the hood at work today. Centered and closer to the front of the hood it looks great on a 1g, i would definitely have it molded and painted though, even though its's not a 3M stick on honda deal, it sure can look like one at a glance.

 

[gsxeclipse97]

Ok.. So i bought a rre vent and its much larger than i thought it would be. So now i have to install this and im rather concerned about cutting a big hole in the hood of my car so.. If one of you there has installed one could you give me some tips and things that i should look out for when i get started.

 

[mavisky]

There's a 2 or 3 page thread on here about the vent if you'd searched.

http://www.dsmtuners.com/forums/app...r/258587-road-race-engineering-hood-vent.html

 

[gsxeclipse97]

I did search and all that came up were a couple of threads about them.. but I'll try much harder next time thanks.

 

[D_Eclipse9916]

You find the pictures you need?

 

[gsxeclipse97]

Yeah... I got see them. its just going to be hard for me to cut a hole in the hood. Did you use any kind of sealent when ever you were finished so water didn't come in through the cracks?

 

[mavisky]

Yeah... I got see them. its just going to be hard for me to cut a hole in the hood. Did you use any kind of sealent when ever you were finished so water didn't come in through the cracks?

You could, but at the same time you've already got one big hole where the water's already coming in.

 

[gsxeclipse97]

Yeah i know that but from what i've read the water drops on the radiator hose and between the turbo and radiator so nothing really important gets wet. but the water that would be coming from other places may possibly land in different spots since it would be running under the vented area.

 

[Defiant]

Ever notice that big hole in front of the radiator? Water comes through that, too. Unless you have some very bizarre aim, some drips through a hood vent won't matter.

Still waiting for tufts, though.

 

[smellmyface686]

hate to be so uneducated, but what do you mean by "tuft"? I'm guessing some way to figure out how much air is being pulled/pushed, or is it like a wind tunnel type of thing?

 

[SOADweskey]

Pretty much you tape yarn along the opening of the vent and then drive and see if it blows out of the engine bay or is sucked in.

 

[snowborder714]

Here's a good link on it:
http://autospeed.com/cms/article.html?&A=108656

 

[smellmyface686]

interesting stuff, i'll be sure to do that when i decide to cut open my hood (before it gets painted of course). So i guess for this vent, you would tape the tufts at the very front of the opening, right?

 

[95autogst]

Now tuft it and show us what it's doing. Don't be shocked if it's sucking air in.

I don't really see where this thought of sucking air into the engine bay is coming from. Whenever air moving at high speeds passes over an opening, a vacuum is created and pulls whatever air is inside of the hole out. This action is also being complimented by the air pressure under the hood trying to push the air out. Now I'm not trying to say that a little experiment is a bad idea... its sure not going to hurt anything...

Also, if you take a look at post #13 you'll see that, although it is a different mood- with the same concept, smoke is being pulled through the vent.

Just my two cents

 

[Locke]

It is Bernoulli's principal and the conservation of momentum vs. the Coanda effect.

 

[talonalex92]

Its the same idea as a sunroof essentially isnt it? Theres no air being pulled in and when it rains, waters not getting sucked in..or is it?WTF

 

[SanTa_]

I want these, but if I use a carbon fiber hood, when they mold it, does it have to be all painted?
That's the downfall I have.

 

[BlazeGT4]

I want these, but if I use a carbon fiber hood, when they mold it, does it have to be all painted?
That's the downfall I have.

You'd want to paint the molded areas, but you could leave the rest exposed if you like. Leaving it unpainted was not an option for me as it would have looks like a giant blemish against white paint. As is, the exposed carbon makes the rest of the vent look huge and I've lost the subtlty I was striving for.

If anyone can PM me instructions on how to do the tuft, I'll give it a shot this Friday.

Regards,

Blaze

 

[white_dsm]

How are you supposed to mold this into the hood? What kind of materials/agents do you need?

 

[turbosax2]

You'd want to paint the molded areas, but you could leave the rest exposed if you like. Leaving it unpainted was not an option for me as it would have looks like a giant blemish against white paint. As is, the exposed carbon makes the rest of the vent look huge and I've lost the subtlty I was striving for.

If anyone can PM me instructions on how to do the tuft, I'll give it a shot this Friday.

Regards,

Blaze

http://www.autospeed.com.au/cms/article.html?&A=108656

 

[gsxeclipse97]

Well the way eveyone says that it creates a low pressure zone over the hole which pulls air out from the hood. So why would it be pulling air into the hole. Since it is based on how the evo one works

 

[Defiant]

I don't really see where this thought of sucking air into the engine bay is coming from. Whenever air moving at high speeds passes over an opening, a vacuum is created and pulls whatever air is inside of the hole out. This action is also being complimented by the air pressure under the hood trying to push the air out.

Yes, but we don't know what's happening, and that's the point. Many cars built with what were thought to be vents turned out to be intakes. Depending on where, specifically, the vent is located -and it can vary by as little as an inch- a hood vent such as this could be a beneficial escape for air, or a pointlessly-blocking hole in the hood. Very slight nuances can affect whether air is going up over the blunt nose of the car, whether the air captured by the nose and funneled into the engine bay and under the car is making a higher or lower-pressure area under the car than exists on the top of the hood. Colin Chapman set the Formula One world on its ear by using aerodynamics where no one else had realized to before, on the bottom of the chassis.

Now I'm not trying to say that a little experiment is a bad idea... its sure not going to hurt anything...

Maybe an hour out of someone's day, once it finally happens.

Also, if you take a look at post #13 you'll see that, although it is a different mood- with the same concept, smoke is being pulled through the vent.

In Post #13, I see air being pumped out of the engine compartment as a nearly-stopped car's furiously-pumping open wheels and tire periphery are pressurizing the small, almost-closed space. Show me that sort of thing while it's moving fifty miles an hour, and it would have some application. DSMs may have a blunt enough nose to make air hop completely over that part of the hood, or the air pulled under the car on the pavement's boundary layer may make more negative pressure than that on top of the hood.

Just my two cents

Cashed and spent. I don't know if this mod is worthwhile or not, but I'd like to see it proven.

 

[gsxeclipse97]

Ok well i understand what you are saying there, but I have driven my car in rain and dirt and whenever it is all dried up the hole hood has the rain bands where the dirt has settled. In all the locations i have see on everyones car so far that area for surely has air passing over it. If it were closer to the nose and they placed it past the hump then i could see that being a problem. because then it would be sitting right over the radaitor.

Once i have my car back I'll do the test and i'll take pictures of the hood to see how it works.

Also if there is a high pressure space under the hood and the only place for it to go is under the car shouldn't that raise the pressure there?

On that same note. If air is being pulled out of the hood releaving the pressure zone under the hood, shouldn't that also lower the pressure under the car causing it to be sucked to the road?

 

[BlazeGT4]

http://www.autospeed.com.au/cms/article.html?&A=108656

, that looks ghey!

Thanks for the link. I have everything set up to go. I just need to locate a chase car.
Hopefully I can grab a friend tomorrow and we'll take pix and a short vid.

Blaze

 

[Defiant]

I can hardly wait.