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post #31 of 35 Old 10-31-2013, 09:45 AM
Siva283
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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


1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

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I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
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. It started with a $200 axle, and a few thousand dollars later I was done :)
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diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

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this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #32 of 35 Old 10-31-2013, 10:01 AM
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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.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

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Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
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Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
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Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #33 of 35 Old 10-31-2013, 11:41 AM
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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.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #34 of 35 Old 10-31-2013, 01:33 PM
mntbkrguy
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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???!!!???

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post #35 of 35 Old 10-31-2013, 02:27 PM
phottomatt
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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.

2010 Flame Red Sahara, Rough Country stubby bumper/winch, Body Armor rock sliders, stiff spring mod and RC 2.5" series II spacer lift (~3.5" total lift), 33X12.5 Duratracs on 15" MB72s.
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