Road Racing - hood mounted radiator heat extraction vents; do they work? (kinda long)

I already have pressure removing vents that are located higher up on the hood, in the low pressure area of the hood. The higher under hood pressure can escape through these vents.


Wonder about the radiator heat extraction vents I've seen on other track cars. These are located directly above & just behind the radiator, on the hood. The area of the hood where these are located is a high pressure area on the hood. So, how do they work? Realizing that the air that enters the radiator is the highest pressure air entering the under hood area, similar pressure is seen on the hood where the radiator heat extraction vent is located, yes? Further, there is a pressure drop through the radiator & fans. So, the pressure behind the radiator is lower than what is seen on the nose of the car (entry into the radiator). Air may actually enter through the vent as opposed to its' intended purpose of exhausting hot air, yes? How can heat escape through this vent when the pressure is likely close to equal on either side of the vent?


Can anyone explain this? Has anyone measured the pressure behind the radiator & above an installed radiator heat extraction vent?


My question is based on the assumption that the pressures are similar on either side of the vent due to the vent being located in a high pressue area on the hood. Am looking for this assumption to be incorrect so that this type of vent can be installed on my car.

Thanks in advance

From what I've learned, it's not going to benefit my set-up much, because I already have the pressure relief vents & there are no cooling issues. However, a car w/ no vents &/or cooling issues can benefit from this type of install.

LG Motorsports races GT-1 Corvettes and they have their own hood design with extractors behind the radiator. The deep extractors appear to start about twelve inches from the front edge of the hood.

Yah, I follow the American LeMans series & have seen their (GT2 class) Vette. Have seen this type of hood vent on several road racing vehicles & it seems to be the recess &/or a lip before the vent that benefits its' performace. On my, car ther would be no recess in the hood. Am torn between adding or not adding it. Only way for me to know for sure is to install one on my test hood & hit the road course for testing. It's a lot of time & hassel. Will have to wait unitl I'm more motivated, but will probably end up testing the set up.

Thanks for the reply.