Kool

I have been trying to think of a solution for running brake cooling lines for my car without deleting my fog lights.

I had the thought today of replacing the side markers with a NACA duct and running lines to the back of the rotor fron there.

I am wondering if there is enough airflow there to get any airflow into the duct?

What do you guys think?

TheRealLefty

I am not a physicist nor do I play one on TV, but I think the answer is clearly yes. But it might take a pretty large NACA shaped opening to get the same velocity of air as a nine inch wide funnel with full frontal air flow. NACA ducts work on the same principle as ground effects, collecting a large volume of air and funneling it through a smaller opening to create velocity, leaving a negative air pressure area in wider area, right?

mj951

you could always go with the 968 style cooling ducts...

Kool

My understanding is that the main benefit to a NACA duct is that is draws air through itself without creating drag. I read a paper that I found from the 50's and basically it said that NACA ducts although not adequate to use in supplying air to a jet engine they can do an adequate job for cooling. That is how I hatched the idea for the brakes. I might be better served with a hose running directly where the stock coolers runs.

Kool

How do they work?

Darwantae951

What does NACA stand for?

Kool

http://en.wikipedia.org/wiki/NACA

ehall

NACA ducts should be used to extract air, rather than ram air. Ram the air in the front and use the NACA duct to pull it past the brakes and through the duct. You shouold be able to route the ram air through the existing nose, without sacrificing the fogs, such that the air will travel through, bye and out.
That's my .02.

ehall

good link, and appears to be accurate.

333pg333

Why can't you just run tube ducting to your rotors without removing lights? Many have.

ehall

Well, the shape of the duct, being flush with the surface, will be passed by faster moving air than exists below the duct.
In airplane terms, think of the inside of the surface as the botton plane of a wing. Think of the air moving across, and past the duct, as the top of a wing. The faster moving air will pull the against the bottom of the wing...creating lift...EXCEPT there is no lower wing surface to block the "pull" of the air. The air, without a stoppage will exit toward the faster moving air surface.

So an NACA duct SUCKS but doesn't blow!
Ram air needs a "catch".
NACA ducts don't catch! they just suck!...like a Jacksonville Jaguars wide receiver!

ehall

Also, keep in mind that the air on the nose, at the fog light level, "spoils". So you might want to create a duct that juts a bit forward of the nose itself. That "should" catch the ram ir, before it spoils. ROFL! Good luck with the wind tunnel bill!

333pg333

Not that this is the exact piece of inlet duct but you get the idea. Put it under your secondary lights at the grill opening and attach your tube duct there going onto the strut attachment.