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Old 05-09-2000, 07:17 AM   #1
Thug
Choke Artist
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Join Date: Dec 1999
Chapter/Region: NESIC
Location: Nashua, NH
Post 22B style hood vents?

So what's the real deal w/the hood vents? Some people say they draw in cold air. Some people say they draw out hot air. I have them, and Im just wondering if when I make my intake heat shield if I should put a top on it or if I should allow the air to flow in from the hood vent.
later,
Nate
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Old 05-09-2000, 07:58 AM   #2
Ian Cook
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1993 Group N Impreza
White (Mostly) ;)

Post

Warm air rises they are supposed to allow warm air out of the engine compartment, but in reality when the cars are shipped they have blanking plates on, as do all of the Euro spec turbos. Although these are very easily removed they do allow water onto certain electrical components ???? Bit of a trade off!!!
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Old 05-09-2000, 11:12 AM   #3
8Complex

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04 FXT
Red

Post

The way they are located in the hood on the body it creates a low-pressure area outside of them which sucks out hot air. You can take them off but you have to worry about water getting in there from washing or rain. I suggest going to your local hardware store and picking up 6 5mm wingnuts to hold on the vents. Makes installation and removal a snap.
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Old 05-09-2000, 08:00 PM   #4
Thug
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Post

I run w/the passenger side one opened up all the time and I have no problems. The engine bay will get wet no matter what. A little bit more water wont hurt anything. Also, people make alot bigger deal out of getting your filter wet than is really necessary. It takes quite a bit of water to hydro lock an engine. And a little rain is not gonnna do that. A huge puddle might, if you had your intake real low.
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Old 05-09-2000, 09:26 PM   #5
8Complex

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I managed to plow through a puddle with my intake run into the right fender and sucked up some water several weeks ago... it soaked my filter and the car had trouble running but it dried out by the time I got out of work.

Just a little story I figured I'd share about the water coming into an intake situation.
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Old 05-10-2000, 07:01 AM   #6
daytonians
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Location: Daytona, FL USA
Vehicle:
2000 2.5 RS Impreza
Sedona Red

Post

The vents are also supposed to suck air from under the hood to help eliminate lift at very high speeds. I have heard others say there is a noticible difference. Personally I have trouble believing they can suck enough air to be of much use for ground effects, because the openning in the front for the radiator is so large. It will let way to much air in. I am debating on whether to close off part of the opening.
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Old 05-10-2000, 09:20 AM   #7
Strepto
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2001 Arctic White
Camaro SS #1800

Post

Someone posted in another thread that the points on the hood where the vents are located are low pressure areas. As air passes over those spots, air from under the hood is sucked out. It's a method to keep underhood temperatures down. If you think about it, if the open air filter sits right bellow the vent, you have some hot air being run over the filter and therefore being sucked into the intake.
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