Wow, ive been debating on cutting holes in my hood to help move the air, but have been hesitant cutting into the hood, seen some nice lines on a few of those pics..... guess I wont feel too bad rearranging the hood a little after seeing this thread...

quote Originally posted by PURPLE REIGN: Here's something a little different for ya

What scoops are those? I have a set that look just about like that. Tigerpaw vents from fibersmith. I still have to install them though.

mine is just like Fie Ros but if you trying to lower temp also cutout the decklid

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its always the ones you dont suspect

quote Originally posted by paulcal: What scoops are those? I have a set that look just about like that. Tigerpaw vents from fibersmith. I still have to install them though.

Those are the Tigerpaw vents from Fibersmith
I have a set too but haven’t decided where I want to put them.

Another vote for the JL Extractor Hood Vents

A little lesson in aerodynamics (as provided to me by my cousin - who builds & designs kit planes for a living). Technically all 3 concepts work, so this comes down to more of a level of efficiency and at what speeds they are more-or-less effective. Also it should be noted that for purposes of cooling the radiator - the radiator sould have a sealed shroud towards the front of the car (this forces the additional airflow through the radiator instead of allowing it to escape around it).

Option 1: Simply cut a hole in the hood...

This allows hot air to escape through the top, but only once the pressure below the hood exceeds that above it. Additionally, the air being forced into the vent through the forward-facing nature further disrupts this airflow. It works, but not the most efficient

Option 2: Create a "vent" in the hood (with no raised leading edge)

This option creates a negative pressure zone which helps create a vaccum to "suck" the air out from below the hood. Unfortunately the lack of a raised leading edge creates additional turbulence in the airflow - reducing efficiency. Vents with a specific "flow" to them will tend to operate more efficiently at lower speeds.

Option 3: Create a "vent" in the hood (with raised leading edge)

This option uses the raised leading edge to smooth the airflow over the vent - creating a stronger negative pressure zone and pulling the air more efficiently through the opening. Again, vents with a specific "flow" to them will tend to operate more efficiently at lower speeds.

I'd like to point out that all these work, and we generally don't travel at speeds where the efficiency is really a high importance... but these are just the physics of the vent/scoop conecpt (as presented to me by someone with some signifigant aerodynamics experience)

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Looking for Fiero posters?

...eh...anyway, my cutout thingie looks better than your arrow thingies

Rob, I REALLY like those diagrams!

I am just a little confused though... Do I really have to get on a traffic circle to get to St. Paul? And which way is North?

quote Originally posted by Fie Ro: ...eh...anyway, my cutout thingie looks better than your arrow thingies

LOL - I'd say all the "cutout thingies" on your car are looking quite nice!

quote Originally posted by blakeinspace: Rob, I REALLY like those diagrams!

Thanks Blake!

quote I am just a little confused though... Do I really have to get on a traffic circle to get to St. Paul? And which way is North?

Traffic Circle to St.Paul? I guess that all depends on where you're coming from You can get there by going straight up I35 (stay to the "E" side when you get this far north) from Texas! BTW: Didn't you know that our former Gov Jesse Ventura declared that the streets of St.Paul must've been layed out by Drunk Irishmen

[This message has been edited by MinnGreenGT (edited 03-24-2005).]

quote Originally posted by MinnGreenGT:: Didn't you know that our former Gov Jesse Ventura declared that the streets of St.Paul must've been layed out by Drunk Irishmen

Man, with statements like that, I would vote him for president.