[aerohead]

Originally Posted by Ville80

One thing that has prevented me from doing my underbody panel for 2 years is where does the air go that cools the radiator?
I am sure you guys read these 4 year old articles by now, but i couldn't find them discussed here:
Part 1 Testing Pressures
AutoSpeed Part1

air enters the grille opening to cool radiator


but if we seal off under the engine, where can the air go?


stock it leaves underneath


if we seal underneath, we should allow some venting, and ideally vent the front of the hood



but i am no way going to cut into my hood!

Part 2 Making an undertray
AutoSpeed Part2

Part 3 Helping air escape
AutoSpeed Part3


So no one has overheating problems sealing everything off? I understand this article is saying that once air enters to cool the radiator, without an exit, pressure is so high, no more air will enter.

To me we should have a vent somewhere on the undertray, located probably towards the front, maybe behind an AIR DAM, for engine air to escape???

i think i read someone has air come out into their wheel wells since it is already turbulent? so cut into the fenders' interior???

They'd have BIG problems if the bay were sealed.Short of cutting onto the hood,you'll have to use the front wheel wells or under engine bay area for air to escape.Exits at low pressure areas are best,but thats at the high camber area of the nose,and at the A-pillars.Both require hood penetrations.