Hood scoop mod

RedTaco2134 · Nov 11, 2009

^^ I must say, there is a lot of "Nay-say" I believe the picture's posted above, show a Functional Hood scoop IMHO. Looks great! Also if you want to know if making our Hood scoops functional or not, read a book on forced induction. And you will see that it will to work, if done properly. Good job Static, I am completely jealous. Just my $.02....

TacoNut · Nov 11, 2009

RedTaco2134 said: ↑

^^ I must say, there is a lot of "Nay-say" I believe the picture's posted above, show a Functional Hood scoop IMHO. Looks great! Also if you want to know if making our Hood scoops functional or not, read a book on forced induction. And you will see that it will to work, if done properly. Good job Static, I am completely jealous. Just my $.02....
Click to expand...

This looks great, Doesn't mean it's going to work.
Bernoulli's principle proves this to be a low pressure point. The wind tunnel tests confirm this. There is no way to make a hood scoop functional in it's current location. As it has been repeated multiple time, the only place it will work is either at the front of the hood, or at the base of the windshield.

chris4x4 · Nov 11, 2009

TacoNut said: ↑

This looks great, Doesn't mean it's going to work.
Bernoulli's principle proves this to be a low pressure point. The wind tunnel tests confirm this. There is no way to make a hood scoop functional in it's current location. As it has been repeated multiple time, the only place it will work is either at the front of the hood, or at the base of the windshield.
Click to expand...

Quoted for TRUTH.

RedTaco2134 · Nov 11, 2009

Yes, I know about Bernoullis law...

JimBeam · Nov 11, 2009

then what part about the low pressure area of the hood making it impossible isnt clear?

EquinsuOcha · Nov 11, 2009

This thread has entertained me for over 6 months.

TacoNut · Nov 11, 2009

From wikipedia, bolded for emphasis.

To be effective, a functional scoop must be located at a high-pressure area on the hood. For that reason, some functional scoops are located at the rear of the hood, near the vehicle's cowl, where the curvature of the windshield creates such a high-pressure zone, and may be placed so that their opening faces the windshield (a reversed scoop).
The scoop will be most effective if it is either mounted high enough to clear the boundary layer (the slow-moving air that clings to the surface of a moving object) or if it is a "NACA duct," mounted below the surface and designed to draw the faster moving air outside of the boundary layer into the duct. A shallow scoop that is not a NACA duct may not admit a useful amount of air even if it is open.
Under the hood, an effective scoop must funnel air into the engine's intake in as short and direct a path as possible, preferably through a tub or channel that is insulated against underhood heat.
A scoop may be part of the hood, or may be part of the engine's air cleaner assembly, protruding through a hole cut into the bonnet. Such a scoop is called a shaker hood, because the scoop vibrates noticeably when the engine is running, especially under power.
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Toyota1998 · Nov 17, 2009

Brunes said: ↑

I think the flutter you see is not created by the scoop "catching" the wind- but by the low pressure and the pressure gradient delta caused by the gust.

The reason a plane flies is because the air moving over the top of the wing is moving faster than the air under the wing and is therefore lower pressure- more or less sucking the wing into the air.

Same deal with a hood- which explains why both your scooped hood and tigers non-scooped hood both shimmy a bit....it also dovetails nicely with the research and testing chris has done...
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You are correct^^, My parents are engineers and my father is an airplane pilot. They give me physics questions and aerodynamic explanations all the time. The low pressure under the hood is what makes it flex up.

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