JeepForum.com - Reply to Topic
Thread: air scoop Reply to Thread
Title:
Message:

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in










  Additional Options
Miscellaneous Options

  Topic Review (Newest First)
10-31-2013 02:27 PM
phottomatt
Quote:
Originally Posted by Siva283 View Post
Hopefully next week R & D here is going to borrow my Jeep. We are gonna put a Flow Meter on it with the hood scoop both ways to settle this once and for all.
Have them check the pressure above the hood, in the eddy the windshield creates and inside the cowl. To every one else don't confuse pressure with flow. The faster air flows over the vehicle the lower the pressure is within that area. Just because it's flowing faster doesn't mean it has more pressure, intact in most cases it is just the opposite.
10-31-2013 01:33 PM
mntbkrguy
Quote:
Sadly no, maybe you should review, as the air flows up and over the vehicle it creates a low pressure area (meaning pressure inside the cowl vent would actually be higher than outside air pressure), it's called Bernoulli's Principle, basic aerodynamics, Google it. I will agree with the statement that the air rolls off or is forced off the windshield into the scoop (when scoop is facing aft) but the high/low pressure theory is not correct, that's all I'm saying.
Attachment 802362


Then why does that damn leaf always sit there floating around on top of my hood at 70 mph???!!!???
10-31-2013 11:41 AM
Siva283 Hopefully next week R & D here is going to borrow my Jeep. We are gonna put a Flow Meter on it with the hood scoop both ways to settle this once and for all.
10-31-2013 10:01 AM
Siva283 Long story short a windshield on a Jeep is straight up and down. It deflects(Pushes air) 2 ways. Those streams are a higher pressure then the vacuum created in the cowl when the blower is on or even just when the vent is open.
10-31-2013 09:45 AM
Siva283
Quote:
Originally Posted by phottomatt View Post
Sadly no, maybe you should review, as the air flows up and over the vehicle it creates a low pressure area (meaning pressure inside the cowl vent would actually be higher than outside air pressure), it's called Bernoulli's Principle, basic aerodynamics, Google it. I will agree with the statement that the air rolls off or is forced off the windshield into the scoop (when scoop is facing aft) but the high/low pressure theory is not correct, that's all I'm saying.
Attachment 802362
We are talking about Jeeps they are not aerodynamic in the least. Look up a better diagram. 30+ engineers disaagree with you and they deal with this day in and day out
10-31-2013 09:28 AM
phottomatt
Quote:
Originally Posted by Siva283 View Post
Which makes it High pressure air. Study up on fluid dynamics. The air in the cowl vent is lower pressure. So Yes the higher pressure reflected air flows into the cowl which is under a mild vacuum even if you have the blower turned on. I can have one of the engineers here explain it in a technical way if you like. If your wondering about where I get my info. This is where I work www.bowlesfluidics.com
Sadly no, maybe you should review, as the air flows up and over the vehicle it creates a low pressure area (meaning pressure inside the cowl vent would actually be higher than outside air pressure), it's called Bernoulli's Principle, basic aerodynamics, Google it. I will agree with the statement that the air rolls off or is forced off the windshield into the scoop (when scoop is facing aft) but the high/low pressure theory is not correct, that's all I'm saying.
Attachment 802362
10-31-2013 08:32 AM
jeepster93
Quote:
Originally Posted by JoonHoss View Post
This isn't a debate, just a discussion.
you YJ guys are so pleasant...(makes me wish I hadn't sold mine )
you want a debate, go over to the TJ section, and tell'm how much of a difference your K&N and TBS made!
I have a K&N. One of the original prototypes, in fact.
Why would TJ owners hate my intake... its pretty. (functional..., but pretty.)
10-31-2013 07:49 AM
Siva283
Quote:
Originally Posted by phottomatt View Post
LOL I know this is a 7 year old thread but you guys have your aerodynamics all wrong. The vehicle acts like an airfoil and as such LOW pressure air is created above the vehicle as the air flows over. Therefore the theory of air flowing from HIGH to LOW is not the correct answer. Now that being said I would suppose that the fact that air flows into the scoop (when facing aft) is merely a byproduct of the air reflecting off the windshield.
Which makes it High pressure air. Study up on fluid dynamics. The air in the cowl vent is lower pressure. So Yes the higher pressure reflected air flows into the cowl which is under a mild vacuum even if you have the blower turned on. I can have one of the engineers here explain it in a technical way if you like. If your wondering about where I get my info. This is where I work www.bowlesfluidics.com
10-31-2013 07:44 AM
Anticanman
Quote:
Originally Posted by phottomatt View Post
LOL I know this is a 7 year old thread but you guys have your aerodynamics all wrong. The vehicle acts like an airfoil and as such LOW pressure air is created above the vehicle as the air flows over. Therefore the theory of air flowing from HIGH to LOW is not the correct answer. Now that being said I would suppose that the fact that air flows into the scoop (when facing aft) is merely a byproduct of the air reflecting off the windshield.
Just had this conversation yesterday. I have the scoop that ties in to the main screen bolts so depending on the time of year, type of top and whether or not I'm running a passenger that is ALWAYS cold, I'm able to flip it around one way or the other to allow more or less air to flow inside the vent feature as it does not respond to fan speed.

Thanks for realizing it was an old bump



10-31-2013 07:38 AM
Siva283
Quote:
Originally Posted by yesterdaylight View Post
schitzangiggles have you ever studied fluid dynamics ? not questioning your post, actually interested in whether you do or not, because i may want to be an engineer and have met some people studying fluid dynamics. is it interesting? later
Here is correct. I work for a company that specializes in Fluid dynamics. Air is considered a fluid in engineering.
10-31-2013 07:13 AM
phottomatt LOL I know this is a 7 year old thread but you guys have your aerodynamics all wrong. The vehicle acts like an airfoil and as such LOW pressure air is created above the vehicle as the air flows over. Therefore the theory of air flowing from HIGH to LOW is not the correct answer. Now that being said I would suppose that the fact that air flows into the scoop (when facing aft) is merely a byproduct of the air reflecting off the windshield.
07-21-2005 12:33 PM
wolf3902 I'm not puttin one on. I already got the best of both worlds.
07-21-2005 09:55 AM
schitzangiggles But you need to replicate the tented brick of the jeep to make the comparison valid! Open your door windows, the open the back window. You will notice that the airflow is from back to front and exits out the door windows (kinda like the airscoop facing the "wrong" way) at highway speeds. Ever notice that when you are going down the interstate and hit the bug juice, that your hood gets soaked, but your wind sheild hardly gets any? Ever wonder how the bug juice makes it nearly to the nose of the jeep? It is the same reason that your scoop should face the window.
07-21-2005 06:32 AM
rcarchie one more reply and i will leave this one alone....i guess it just boils down to personal preference....if you take an empty glass and drag it through water with the opening facing forward in the direction you are going and then doing it again with the opening facing rearward, which way do you think will capture enough water to fill the glass the fastest?.........should be the same principle for capturing air.....i know all about drag car dynamics and positioning the air scoop above the hood to catch the most air possible to get the ram air affect.....i used to do a little dragging myself.....my arguments are the same regardless of the position of the scoop if it is located close to the hood or raised above it.....one air stream is just more potent than the other......
07-20-2005 08:00 PM
sentinal02
Quote:
Originally Posted by Toyandgadgetguy
And with all of this... nobody mentions that the washer fluid will hit the window if you place the scoop facing the window...

It hits everything but the window if you face the scoop towards the grille.
i've heard of this problem, but mine faces forward and no problems with the wiper fluid. mine must be a hair shorter
This thread has more than 15 replies. Click here to review the whole thread.

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

 
For the best viewing experience please update your browser to Google Chrome