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Old 10-08-2007, 03:27 PM   #1
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Air Vent Position - is it true

....that when fitting an air vent grill cover it should be fitted with the opening facing toward the screen, not forward toward the open air...?

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Old 10-08-2007, 03:47 PM   #2
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Iv got the open end facing to front of the jeep, seemed logical to me?

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Old 10-08-2007, 03:54 PM   #3
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i've always been told its supposed to have the open end facing the windshield, but i've never understood how thats supposed to work
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Old 10-08-2007, 03:59 PM   #4
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i've always been told its supposed to have the open end facing the windshield, but i've never understood how thats supposed to work
Yea, I think it looks 100x's better open end facing the windshield, but I think it would work better open end facing the front.

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Old 10-08-2007, 04:00 PM   #5
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Facing the windshield, when moving the air hits the windshield and will curl forward towards the front of the vehicle: think 70 chevelle cowl induction. If facing forward the scoop must be raised up to get out of the stationary boundary layer of air to get good results: think pro stock drag car with those large scoops on the hood.
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Old 10-08-2007, 04:11 PM   #6
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What are you guys talking about?
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Old 10-08-2007, 04:12 PM   #7
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What are you guys talking about?
Hood scoops.
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Old 10-08-2007, 04:22 PM   #8
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I havent seen a hood scoop on Levinoss' Jeep
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Old 10-08-2007, 04:26 PM   #9
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I loved the hood scoops in my T-bird
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Old 10-08-2007, 04:32 PM   #10
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we talkin about hood scoops or the little thing that goes over the vent right under the windshield?
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Old 10-08-2007, 04:35 PM   #11
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we talkin about hood scoops or the little thing that goes over the vent right under the windshield?
Bad choice of words on my part, then vent scoops
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Old 10-08-2007, 04:48 PM   #12
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aaaa. well see i've always thought that cowl induction scoops were facing the windshield bc the air moving past them would suck the hot air out of the engine compartment. thus. when you turn these vent scoops around, does it not suck air out of the vent you're tying to force air in? i've never really understood the physics of the air movement in this situation. and to be honest probably never will until i see a windtunnel test with smoke to watch the air flow and what it does. but seems to me facing it forward would ram the air down the vent
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Old 10-08-2007, 05:25 PM   #13
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aaaa. well see i've always thought that cowl induction scoops were facing the windshield bc the air moving past them would suck the hot air out of the engine compartment. thus. when you turn these vent scoops around, does it not suck air out of the vent you're tying to force air in? i've never really understood the physics of the air movement in this situation. and to be honest probably never will until i see a windtunnel test with smoke to watch the air flow and what it does. but seems to me facing it forward would ram the air down the vent
Pretty much spot on. It's not designed for induction, it's for cooling. Air entering it from the front has no where to go (it's not designed as a wind tunnel, the air goes in and stops when it hits the wall) by facing the vent toward the windshield you create a low pressure zone over the cowl and pulls the hot air out allowing for more cool air to enter through the grill and the under carriage.

Not a perfect explanation in this case because the cowl is for the heater system, but you can work with it.
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Old 10-08-2007, 05:29 PM   #14
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Pretty much spot on. It's not designed for induction, it's for cooling. Air entering it from the front has no where to go (it's not designed as a wind tunnel, the air goes in and stops when it hits the wall) by facing the vent toward the windshield you create a low pressure zone over the cowl and pulls the hot air out allowing for more cool air to enter through the grill and the under carriage.

Not a perfect explanation in this case because the cowl is for the heater system, but you can work with it.
I thought the thing was supposed to suck air in for the ac/heater?

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Old 10-08-2007, 05:29 PM   #15
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but with it being for the heater system, wouldnt you wanted it pointed forward. to ram more air in through the system forcing it to blow more out on the inside? where as if you turn it around, it pulls your hotter air out. thus losing your heat and not blowing as hard
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Old 10-09-2007, 06:05 PM   #16
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Heater vent scoops are like blinker fluid or horn lube, neat to buy but kind of a waste
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Old 10-09-2007, 06:35 PM   #17
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Maybe can clear up the Cowl Induction(ala 69 Z28) reasoning for you guys

The reason it faced rearwards is because as the air passes over the vehicle there is an area of Low pressure resonably still air that collects at the base of the windshield.....as evidenced by GMs wind tunnel tests at the time......this made a rear facing hood scoop optimum......most front facing scoops of the day were place so far back and so low that they actually drew little air at speed......one exception would be the twin scoops on early second generation Firebird Formulas.......

The added benifit of the rear facing is less debris in the air induction system......My old Camaro would lterally suck water droplets off the top of the Cowl hood youd see em scoot back and over the edge and it wasnt wind it only happened when the flapper door opened when ya leaned into it in the rain......evidence of a low pressure area in practice

I would assume that a Wrangler type vehicle with a much steepper angle to the windsheild would have a large low pressure area at the base of the winshield as well so I would face the scoop backwards.....g
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Old 10-09-2007, 07:54 PM   #18
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agian, i need to see the windtunnel testing. you're talking about forward facing scoop and cowl induction. they're two seperate things.

cowl induction (rear facing) to my knowledge is to pull hot air out of the engine compartment

forward facing scoops (ram air scoops) are used to ram air into the intake.

am i correct or not? (not tryin to sound smart @$$) askin on seriousness
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Old 10-09-2007, 07:54 PM   #19
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The real question is do I need to flip mine in the other direction or is it not such a big deal?

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Old 10-09-2007, 07:56 PM   #20
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i'm thinkin of goin to the hanger this weekend and takin all our really big fans (maybe just pull a plan out front) and blow lots of air towards the heep and puttin some smoke in front to test it for myself..... pretty crude i know but better than nothing. unless i convince myself that theres too many variables to control and get a decent result
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Old 10-10-2007, 07:08 AM   #21
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Just tape some yarn to your hood and drive, much easier. In the XJ the low pressure area on the hood is up front, about where jeep puts the hood vent on the ZJ's. The area near the windshield is high pressure.
On a TJ, who knows, it's a BRICK, flat nose and flat windshield.
Back in the pre 60's they put vents in front of the windshield that you would flip up and the faster you went the more air you got inside the car. The vents were scoop oriented.

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