My Final Word On Cold Air Intakes - Page 3 - JeepForum.com
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post #31 of 70 Old 12-16-2008, 12:31 AM
gittman140
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any new plans or suggestions to keep the rain out? i am in school in PA and it rains way to much to not worry about it, thanks

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post #32 of 70 Old 12-16-2008, 07:21 AM
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I would suggest installing a outside air, I think its a filter that mounts on top of that opening and filters the air that goes in to the cabin, but I'll look into it and look for the link.

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post #33 of 70 Old 02-13-2009, 09:01 PM
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I'd like to see a pic. Sounds like the most logical of the bunch.
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post #34 of 70 Old 02-13-2009, 09:23 PM
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Though I apprecizate the effort you put into it, I wouldn't think its a very good setup for the times its raining hard. There are actually better places under the hood(including the stock location)that will do the job efficiently. Air temp really isn't a big issue with these 4 litre engines under most circumstances. The timing specs on the cams really minimises intake and exhaust modifications. The stock cams are short duration cams with quick intake valve closing points. You will probably make a little power in the upper rpm range of the powerband, but is that where we really rev these engines under most conditions? No.

Want the best of all worlds? Then take your hood off and have a bodyshop put hood louvers in. That way all the hot air can escape the vehicle quickly and efficiently. Very easy to lower the under hood ambient temp if you use your noodle. DOesnt cost much to have a body shop do that either.
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post #35 of 70 Old 02-13-2009, 09:32 PM
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There isnt enough air flow in the cowl to say that you are getting colder air. As you drive down the road ambient air is coming in alot more than it does through that cowl. So not only does your engine breath cooler air in stock location than it will in the cowl, it also has more of a ram air effect than inside the cowl set up.

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post #36 of 70 Old 02-13-2009, 10:11 PM
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Originally Posted by rubidriver View Post
There isnt enough air flow in the cowl to say that you are getting colder air. As you drive down the road ambient air is coming in alot more than it does through that cowl. So not only does your engine breath cooler air in stock location than it will in the cowl, it also has more of a ram air effect than inside the cowl set up.
Would someone kindly translate this nonsense for me? thx
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post #37 of 70 Old 02-13-2009, 10:12 PM
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Would someone kindly translate this nonsense for me? thx
seems pretty cut and dry to me
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post #38 of 70 Old 02-13-2009, 10:35 PM
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seems pretty cut and dry to me
Does it? Air hitting that rather flat windshield at speed has considerably more "ram air" effect feeding that intake directly beneath the cowl vent than does the stock air box opening sitting behind your headlight; or maybe I need a refresher course in aerodynamics. Google cowl induction...

Last edited by 661; 02-13-2009 at 11:41 PM.
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post #39 of 70 Old 02-13-2009, 11:18 PM
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Having the air filter in the cowl WILL give more "ram air" effect then under the hood. The stock air box is specifically put in a location up high and out of the way, where very little air/water flow could get to. It's still in the engine compartment, where the most amount of heat is, at the top of the hood. Not to mention that the air that is moving under the hood had to pass through the radiator to get there first. Therefor making it hot and not "ambient.'' The air that enters the cowl has had not temperature affect from the Jeep. Also, when your driving down the highway, do a test. Put your fan on the lowest setting, switch from Recirc to Fresh air. Notice how the fresh air setting pushes out a lot more air then recirc. If you were to do this at a stop, it would be vice versa. The is in fact the "cowl induction" effect that happens.

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post #40 of 70 Old 02-13-2009, 11:49 PM
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If I had mine under the cowl like that it would be packed with mud... and even if it did have a cowl on it crap is still going to get washed down off the windshield and into it.

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post #41 of 70 Old 02-14-2009, 12:35 AM
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mine will be going in the cowl, tho I'm tempted to put a snorkle on.

the box is a cut down 98+ winstar/explorer. 99 escorts also have the same size main body with the cone filter... they have a drain hole so it wouldn't saturate the filter if it did get water in from the cowl, which can be plugged for deep water.

I did this because i was way past tired of listening to the noise from the cone filter. my fenders are highlined, so theres no room for the factory box.

ram air is pretty much BS on a jeep, most never go fast enough to take avantage of ram air. the ramed air has to be pushing more pressure than the vacuum of the engine and is only effective if your going toooo fast. at that you'd be building a shaker hood scoop for the tj or a bug collector.
cowl induction is a proven method of cold air way back to the 60's on production cars.... right along with ram air, in 12 second cars off the showroom floor.


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post #42 of 70 Old 02-26-2010, 11:44 AM
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i wana do the same thing for my air intake. are you using the stock airbox without the lid to hold the filter? and how do you get to the location of the filter, just through the hole cut in the firewall or is there more to it? thanks!

and also, id get a hood scoop to cover that vent, put it backwards, and just put a piece of outerwears over the vent, that will eliminate any worry about water.

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post #43 of 70 Old 02-26-2010, 11:56 AM
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Originally Posted by Tmblack3 View Post
i wana do the same thing for my air intake. are you using the stock airbox without the lid to hold the filter? and how do you get to the location of the filter, just through the hole cut in the firewall or is there more to it? thanks!

and also, id get a hood scoop to cover that vent, put it backwards, and just put a piece of outerwears over the vent, that will eliminate any worry about water.
For the underhood option I think people have done with stock airbox, although I believe most have used either a buick or windstar box. I used a windstar box for mine. The hole in the firewall is for the intake to breath but the box is under the hood and that's where the filter is. No need to go into the cowl to change the filter (although OP's setup is like that). I did put a reverse facing scoop on, although I'm not too concerned about rain water getting in there. The intake isn't directly under the vent and is obviously at a right angle to the vent. The drain on my cowl is pretty big and even if it were to clog the intake is still a couple inches off the bottom. If drain clogged the water might start draining through AC into jeep before it goes in the intake. Cowl scoop did collect a lot of leaves during the fall, but that is easy to stay on top off.

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Last edited by biffgnar; 02-26-2010 at 12:11 PM.
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post #44 of 70 Old 02-26-2010, 11:59 AM
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do you get a lot of water on that filter being that it is open to the elements??


nevermind I see you will eventually address that issue.
I would think that doing water crossing would be risky. As the water flows over the hood it will be directed right to the filter.

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post #45 of 70 Old 02-26-2010, 12:06 PM
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I would think that doing water crossing would be risky. As the water flows over the hood it will be directed right to the filter.
And your stock intake or an open under hood filter would be better? If water is over the top of the hood those are going to be underwater. If you've got enough water coming over the top of your hood such that its all the way to base of the windshield the only type of intake that saves you is a snorkel. Actually, even with this mod I wouldn't want to be deep enough that water was coming over top of hood. Would worry about cowl filling from the bottom up through the drain. That being said IMO cowl is better place for intake than stock for a couple reasons - higher, cool air, avoid dipping front end into holes, fan doesn't throw water into intake, etc.

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