Hood Scoop? Need suggestions

[dslocal]

Hey I am looking into doing a hood scoop as much as I hate them. I have a set of blitz turbos and the way I had to mount the intake makes it suck in a ton of hot air from the turbos.
I am going to make some kind of a scoop in the hood right behind the passenger side headlight and I am not sure what would look good, I am thinking of doing a reccessed style one that didn't stick out, I looked and I couldn't find any pictures, Does anyone Have any?

 

[Canuckrz]

Could do something like this but on the hood rather than the headlight: http://www.revlimiter.net/mods/duct_install.html

I'd make an airbox as well/instead personally, rather than just a scoop.

 

[sous]

like the stock but 2 inch higher

 

[ERA]

Stout hood?

 

[dslocal]

That one^ would be perfect! But I am feeling kind of cheep right now and I have a spare hood just laying around and I have all the materials so I was thinking about trying to make my own and that naca duct looks pretty easy to replicate, I might sharpen the edges a little bit because there aren't many curved lines on the mk3, What do you think
If you want I will post some pics and maybe get some suggestions along the way.
Figured I would throw these up to show what I'm Trying to feed, (I already have a piece of 3" tubing feeding it from where the fog lamp was, I just want more,

Pic of whole car, still got my 4x4 going:nono:

 

[fazzt73]

im musing this in my ae92 project its about 9x16 in

 

[hvyman]

if u do cut the hood you should round the edges. the body has sharper lines than the mk4 but there still rounded edges. round it out just like the stock hood scoop so it matches.

 

[dslocal]

Well I figured It was time to post some updates, now it has only been welded, I still have to bondo it and primer it, I also need to ad some new supports underneath because I had to cut some of them out.

Tell me what you think.

 

[Canuckrz]

Haven't seen an naca duct mounted backwards to be used as an exit before, I wounder how it will flow.

 

[gaboonviper85]

Honestly...that looks horrid in my opinion.

Maybe when it's done it will look better...but right now I hate that you went all crooked and have two vents! Sorry bro:-(

 

[hvyman]

^i would have to agree. i think the corners are to sharp also. the bumper corners are about the sharpest lines on the car and there still not that sharp.

 

[Supracentral]

Haven't seen an naca duct mounted backwards to be used as an exit before, I wounder how it will flow.

Neither have I.

Maybe when it's done it will look better...

I suspect it will. It certainly looks like it will be functional, provided that NACA duct flows properly in reverse.

 

[Canuckrz]

I've looked up some information on reverse mounted NACA ducts, and there's a lot of conflicting opinions on whether they will flow efficiently or not, but here is the one that seemed to make the most sense to me:

http://www.aviationbanter.com/showthread.php?t=1013

Reverse NACA duct ... Bad Idea!
Several years ago I read about someone installing a NACA scoop, pointed end
aft, to remove air from the cabin. I thought I would do the same for my
plane but first decided to test the idea. I built a NACA scoop and ran
high speed water through it in both forward and reverse directions. In
forward the water flowed as expected. In reverse the water exited at
nearly 90 degrees to the slip stream.
I believe a NACA scoop will just add drag, especially to fast
planes....Better to just use a ramped exit.

Russell Sherwood
Houston, TX

It is hearsay though, but it makes a lot of sense regardless and appears to have testing to back it up. There are people who think it would flow fine in reverse who seem knowledgeable but the majority of them are against it.

EDIT: Found another comment in the thread to do with it.

I had heard that too, so I contacted NASA about it. Spoke via E-mail
with one of the aerodynamicists. I told them I thought I understood
the principle of the NACA duct and that I'd like to use it to
facilitate removal of cabin air.

He replied that "obviously" I did NOT understand how NACA ducts
worked, or I would not be suggesting that I use one to draw the air
out of the cabin because that's not how they work.

So I meekly asked what might work, instead of a NACA duct and he
replied almost any opening would work, as long as it was placed in a
low pressure area.

So if he isn't lying which I highly doubt he is; the NACA duct is a bad idea in reverse, strait from the horses mouth.

 

[dslocal]

ok well I am stoked that I got all these opinions!
So now judging by the opinions based from ^ I was thinking about taking the naca duct and just making it into a straight duct, Leaving the larger opening the same and just widening the back part? Opinions?
As for the front one, I am definatly going to straighten it out, I was looking more closly at the pictures and I Hate it now... Its got rice stains all over it. So anyways I am going to even it up along the top of the vent and I was planning on rounding the edges out more once I went to bondo it and smooth it out a little, Any other ideas?
Maybe someone with photoshop?
Thanks

(one more quick thing, does anyone know where the paint thingy is on a mac, or even what its called? I am pissed off at this pos. User friendly my ass)

 

[Supracentral]

(one more quick thing, does anyone know where the paint thingy is on a mac, or even what its called? I am pissed off at this pos. User friendly my ass)

There used to be something called MacPaint, but I think it went away with the introduction of OS X.

There are tons of downloadble freeware paint apps for the Mac however.

Paintbrush is one of them:

http://lmgtfy.com/?q=MS-Paint+equivalent+mac+freeware+paintbrush

Ugh.. Macs...

 

[Neodeuccio]

I'm not a fan of the original angled design, but I think it will look awesome once it's straightened out! Be sure to post more pics as it progresses!

 

[Canuckrz]

I'd take the NACA duct and put it where the forward duct is now and make a simple reverse vent where it was. The NACA duct is VERY effective given it is in the proper orientation.

 

[Supracentral]

Something like this? (very quick and dirty photoshop...)

 

[Canuckrz]

Yeah like that ^ but with the naca duct as forward as underhood space will allow.

 

[Neodeuccio]

That would be sweet... If it works.