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Old 06-09-2012, 04:54 AM   #41
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^ I sort of want to buy that to make an intake
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Old 06-09-2012, 11:15 AM   #42
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Quote:
Originally Posted by bbundy View Post
Just don’t ever assume locking your doors does anything they snap out easily and you can reach the inside door lock with your arm through the hole. The NACA style ones simply flow a lot more air into the cockpit and you should have eye protection if you have them.
The NACA ones are too small to get your arm through unless you're a midget or child (at least mine is). Miatas aren't hard to break into though so I think it's better assumed that your car is never really locked.

I've been running mine for 2 years on the street/track now and have not had any debris come in through mine. I dunno, I think you guys are over analyzing this. Debris could come in through an open window or over the windshield too but it generally doesn't.

Mine from advanced autosports:
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Old 06-09-2012, 02:55 PM   #43
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found a pic from a NASCAR:

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Old 06-10-2012, 08:03 PM   #44
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I wish someone made a driver side quarter window with a wee little NACA duct on it like the bottom right one in the above picture so that there was enough room between it and the steering wheel to put a 90 degree bend on it pointing into the footwell for some ventilation down there.
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Old 06-10-2012, 09:48 PM   #45
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Anyone have a link to the round snap in ones?

I don't know if it's manopause or what but I get so hot while driving my car, these mx5's just seem to have NO airflow even with the windows open and the (non ac) fan on.....

As mine gets DD use the smaller ones with the cotter pin trick look perfect.
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Old 06-10-2012, 09:55 PM   #46
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Quote:
Originally Posted by mx5-kiwi View Post
Anyone have a link to the round snap in ones?

I don't know if it's manopause or what but I get so hot while driving my car, these mx5's just seem to have NO airflow even with the windows open and the (non ac) fan on.....

As mine gets DD use the smaller ones with the cotter pin trick look perfect.
http://www.advanced-autosports.com/i...roducts_id=127
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Old 06-11-2012, 02:27 AM   #47
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i want these but can't find them in the US...
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Old 06-11-2012, 02:36 PM   #48
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I'm glad I found this thread as I was looking for cooling solutions for after I rip out my AC.

The Advance Autosports NACA units appear to be slightly smaller than the Weekend Racer version.

Advance:

http://www.advanced-autosports.com/i...roducts_id=126


Weekend:

http://www.weekend-racer.com/index.p...roducts_id=313

The Weekend one looks like its too big jammed in there at an angle. It looks like Curly, Wildo and Njn63 are all running the Advance version, and to my eye, its more aesthetically pleasing as its tucked down further into the available space. I'm sure they are both highly effective.

The ability to close the round ones is also attractive... How well do the round pop-out ones keep out the rain?
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Old 06-11-2012, 04:08 PM   #49
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Quote:
Originally Posted by motormechanic View Post
i want these but can't find them in the US...

http://secure.mckinneycorp.com/AMAZI...asp?Cc=NACA&Bc=

just not clear. those should be easy to source.
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Old 06-11-2012, 06:02 PM   #50
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God dammit, did my post not work earlier? Oh well.

Quote:
Originally Posted by EO2K View Post
It looks like Curly, Wildo and Njn63 are all running the Advance version
Custom actually. Use some left over Lexan from my hardtop window project. The ducts were $40 or 50 shipped off ebay, from some old NASCAR or similar.

Word of advice, if you do these on your own, practice drilling on a scrap piece first, like the piece you cut out for the duct. Do your drilling wrong and the swarf will scrape the Lexan as it spins around the bit.

Passenger side:



Driver's side, with no issues with hand/duct interference. And there's no way you're fitting your arm in there. A keen eye will notice I wasn't very accurate when measuring between sides.



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NACA Window Ducts-5db03721.jpg   NACA Window Ducts-2f091dfb.jpg   NACA Window Ducts-2e5b26e6.jpg   NACA Window Ducts-db46c0c9.jpg   NACA Window Ducts-59e33eb6.jpg  

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Old 06-11-2012, 07:52 PM   #51
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Better pictures of my one from advanced. I only ordered the passenger side one because I was worried it'd interfere with the area around the steering wheel. I think there would be enough room but I kind of want a lower profile one like Curly has on the driver's side.





I use a cap from a shipping tube on mine. It has stayed on at over 100 mph and keeps most water out:
Attached Thumbnails
NACA Window Ducts-9f52a388.jpg   NACA Window Ducts-c9bf51ef.jpg   NACA Window Ducts-fc1da980.jpg   NACA Window Ducts-7df8235a.jpg   NACA Window Ducts-clear-mailing-tubes.jpg  

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Old 06-12-2012, 11:22 PM   #52
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Quote:
Originally Posted by ZX-Tex View Post
Thanks for the comparison. I am going to put a set of these NACA vent ducts in my track car. As far as the track debris, I could see that happening LOL. Freaking rubber bits flying everywhere sometimes. A piece of coarse wire mesh over the exit end of the duct would help with that.

Keep in mind for those reading this thread whether or not your racing and/or HPDE organization allows you to have the windows up. NASA, where I race, requires the front windows to be completely rolled down. Mine is actually removed from the car completely. So a venting solution that uses the rollup window will not work in my case. But the NACA vent windows will.
I tend to get more garbage through the window. So much so that I think the NACA duct wont matter much. Problem is, I have a halo seat and I need to remove the quarter window to get out of the drivers side. Ill probably add one to the passenger side and aim it at me though.

Also, all you paint cap guys might try a different method. A rubber ball works perfectly and seals perfectly. No tape needed. It has worked extremely well for us in the past.
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Old 06-12-2012, 11:29 PM   #53
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I've tried. I'd use one if I had the duct pictured above, but if you notice I have four rivets in mine. The ball barely goes in before it hits them, and just falls out. And with the rectangular opening, there's no putting the ***** in from the outside.
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Old 06-13-2012, 02:51 PM   #54
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Quote:
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And with the rectangular opening, there's no putting the ***** in from the outside.
That's what she said.
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Old 06-14-2012, 04:57 PM   #55
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got some stuff in the mail today from GeneSplicer:

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Old 06-14-2012, 08:24 PM   #56
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Quote:
Originally Posted by EO2K View Post
The ability to close the round ones is also attractive... How well do the round pop-out ones keep out the rain?
No issues, the rain stays out fine if they're closed and pointed forward. Closed and aimed downward would be the most ideal to keep rain out, but I usually go for down and open. Still keeps rain out but allows a bit of airflow.
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Old 06-17-2012, 10:26 AM   #57
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I'm gonna miss Kenny...
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Old 06-17-2012, 06:24 PM   #58
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I'm gonna miss Kenny...
bro I've been rocking out to this while working on my car. great tunes!
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Old 06-20-2012, 03:44 PM   #59
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Here's a stupid question, how hard are these to install? Mainly do I need a new window seal, or is there a way to get the old one off without destroying it?
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Old 06-20-2012, 03:58 PM   #60
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My seal came off perfectly fine. The biggest pain in the ******* was the black goop on the doors. Use lube of personal preference for installing the new seal and you'll be golden.
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