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Fender fresh air vent

davo727 said:
Id like to have some kind of ram air on my trucks but I think I would need some kind of cable operated diverter valve to switch the flow from a dry location under the hood for the times here when the sky opens - sometimes the rain here is like driving underwater.
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The scoop we ran on the blown dragsters had butterflies you could connect to a cable instead of a throttle... still available. ):h for a couple o Benjamins!
 

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Yeah, Im talking ram air on automobiles though. I have an aeronautical engineering degree, although I dont do it for a living. But yeah you got more things going on, and that doesnt mean its necessarily ram air. Anything is ram air by those definitions. Anything that moves forward and air enters a caivty which you draw air from. But in the performance automobile industry it means something different. I dont think Ford would call that ram air on their truck.
 
As you said, ram air is ram air.

However, this is no longer very productive to the discussion of a fender vent on a truck, so I'll just gracefully bow out and leave you gents to it...

:)
 
What do you guys think of something like this for the intake side (the one meant for a single 4" hose)? http://www.attwoodmarine.com/store/product/Collector-Box-For-Stainless-Steel-Vent-Double-Outlet

And, here's some interesting pictures of scoops and vents: http://www.attwoodmarine.com/store/category/ventilation/vents

Concerning the rain coming in... a while back this discussion had come up and it got me thinking. Then I noticed my wife's old BMW 528 has a similar air intake system where air comes directly in through a good size hole in the lower grill, then follows a path directly to the air filter. I figure, if it works for a BMW, it'd have to work for our trucks, right? Besides, even if the filter gets a little wet, wouldn't that just basically cause a poor man's "water mist" injection? Granted, it probably wouldn't help much (if anything) for performance, but I don't see it hurting anything.
 
buddy said:
Well, water if some large drops came off could tear up a turbo, thats the real problem for us.
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I would tend to think that the filter would "filter" :rolleyes5: any large drops and keep it down to a minimum? Maybe there just needs to be a way for water to escape, then it won't even be an issue?

Although, now that I'm thinking more about this, I recall seeing a Banks product some time ago (for the Duramax) that was essentially the piece I linked to with a hose already attached. However, it was one entire, molded piece. But, Banks had a couple small slots/holes on the back side of the vertical "hose" that would let water escape.
 
With all the bending and what not its not likely for water to make it all the way to our OEM air box. Main problem would just be a direct scoop from the hood. If a filter gets saturated with water in a spot water can regroup on the other side of the element
 
I was thinking (what, you can't read my mind?:smile5:) more along the lines of putting it directly under the bumper. Obviously, this wouldn't be for someone who does any off-roading. I also don't think I could do it since I have an IC hanging down there already. Actually, there would probably be room to mount the scoop, but snaking the tubing up would be the problem as the IC tubes come up that way.

Oh, I found the Banks thing - it's called Super Scoop: http://www.bankspower.com/products/show/271/3
 
Thats a cool setup for the Dmax. You notice though that its called Ram Air, but it notes that its not really Ram air unless you add the super scoop to ram cold air in. As it is, that is just a cold air intake until the superscoop goes on. Some aftermarket guys are shifty with thier advertising.
 
hey jumping back to pressures, do any of you guys know what pressure you gain at 60mph? I know there is alot of volume going past the truck at 60mph due to the amount of frontal area of the truck but how much "pressure" would there really be? If know one knows I have a few diffrent size gauges (down to ounce per square inch measurements) I will pipe one up to a cup and do a test.

for that matter it can be for any given speed but I used 60mph due to it being a common reference.
 
IIRC, in 1970something, a magazine cut a hole in the center of the hood, then taped several scoops of different kinds in different positions WITH A VACUUM/PRESSURE GAUGE attached to a hose at the opening. Seems like they came up with 2 sweet spots; at the cowl, and at the lead edge of the hood. A Mopar 6 pack scoop caught the lead edge best, the best cowl scoop looked like it was for a high rise tunnel ram, IIRC at all.

Wow, flashback!

Will anybody do something like this? (obviously not a center cut hole for a side turbo)
Stats, dammit, real numbers / apples to apples, what do ya say?
 
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Its low pressure by any means (0.1psi), but having positive pressure is better than negative pressure. Here are some good reads about placement of "ram" air inlets and low pressure zone that create a vacuum. And also hood vents. Youll notice that on the edge of the fender and side of vehicle is a low pressure area, and that low pressure area creates a vacuum to any volume on the side of the fender.

http://www.autospeed.com/A_110360/cms/article.html

http://www.autospeed.com/cms/A_2162/article.html
 
Ah I see, well I have a few monometers laying around at work maby I will set one up and get some readings from the fender (stock setup) and see how many inches +/- of water we really get in there. I have a day off today so I think I will try to test tonight.
 
DennisG01 said:
What do you guys think of something like this for the intake side (the one meant for a single 4" hose)? http://www.attwoodmarine.com/store/product/Collector-Box-For-Stainless-Steel-Vent-Double-Outlet

And, here's some interesting pictures of scoops and vents: http://www.attwoodmarine.com/store/category/ventilation/vents

Concerning the rain coming in... a while back this discussion had come up and it got me thinking. Then I noticed my wife's old BMW 528 has a similar air intake system where air comes directly in through a good size hole in the lower grill, then follows a path directly to the air filter. I figure, if it works for a BMW, it'd have to work for our trucks, right? Besides, even if the filter gets a little wet, wouldn't that just basically cause a poor man's "water mist" injection? Granted, it probably wouldn't help much (if anything) for performance, but I don't see it hurting anything.
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I really like that SS Louvers for the Fender, it doesn't list the dimensions though. I like the sharp angle of the fins. Would draw some serious air I think.

Also that Banks CAI is pretty nice too, a good way to get cooler air for sure.
 
On the fender, at highway speeds the only way youre getting air to draw in is if it is scoop tall enough to grab the air stream. any opening in the fender wall will make a vacuum of the cavity. Which will make air circulate from the front bumper to out of the fender so what the air filter pulls will be potentially cooler, less stagnant. However it reduces the "ram" air effect.
 
buddy said:
On the fender, at highway speeds the only way youre getting air to draw in is if it is scoop tall enough to grab the air stream. any opening in the fender wall will make a vacuum of the cavity. Which will make air circulate from the front bumper to out of the fender so what the air filter pulls will be potentially cooler, less stagnant. However it reduces the "ram" air effect.
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Im still not convinced of the vacuum therory. Can you think of a way to meassure air speed? I think aircraft have a Peto (sp?) tube, but that could be costly?
 
The testing done and presented in the articles I posted showed low pressure zones on fender edges and side of vehicle, and vacuum at the wheel well. Our trucks are probably worse than those semi aerodynamic vehicles. The wheel well is a cavity which air can be pulled from, just as the fender is.
 
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