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Operation Get rid of the Fan covers! - Page 2

post #11 of 34
Quote:
Originally Posted by RoadRashed View Post
I disagree... You can absolutely feel the difference and I had a noticable temperature drop. With the grill in place, air was "bouncing" off the grill and going back into the case....or "leaking" around the edge of the fan and going back in the case. The air is going to flow to the point of least resisitance. The fan doesn't have a perfect seal against the case (and there is space between the fan blades and the fan housing for backflow), so the increased pressure isn't going to push the same amount of air out of the case as the fan does without the resisistance.
Well then you disagree with the laws of physics. It may very well feel different and you may get temperature drops, but neither of those things means you can violate the laws of physics.
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post #12 of 34
Quote:
Originally Posted by stargate125645 View Post
Well then you disagree with the laws of physics. It may very well feel different and you may get temperature drops, but neither of those things means you can violate the laws of physics.


Please explain... You have increased resistance, you have increased pressure. You increase the pressure and the fluid (air) is going to try and find a path to follow with less resistance. In the case of a rear fan, that fluid is going to backflow around the edges of the fan blade, or leak between the case and the fan. Either way, SOME of the air flowing through the fan is going to stay in your case...

It's like taking a water hose and using one of those adjustable pressure heads. If you have that thing screwed on perfectly tight and increase the pressure...sure, you get the same flow out the end. Loosen that head a bit so the thread don't have a perfect seal. With the head completely open (least resistance), all your water will flow out without leaking at the threads.....increase the pressure by twisting that head closed and you'll get wet when that extra pressure causes water to come spraying out around the threaded connection. A fan right against a grill is similar...

I did not claim you get more CFM through your fan....I am saying you'll get more air pumped out of your case (in the area you want it removed.....near the CPU) without a grill. (assuming you have enough air getting pumped INTO the case or plenty of intake vents in the area).
Edited by RoadRashed - 5/21/08 at 8:17am
    
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post #13 of 34
Quote:
Originally Posted by RoadRashed View Post
Please explain... You have increased resistance, you have increased pressure. You increase the pressure and the fluid (air) is going to try and find a path to follow with less resistance. In the case of a rear fan, that fluid is going to backflow around the edges of the fan blade, or leak between the case and the fan. Either way, SOME of the air flowing through the fan is going to stay in your case...

It's like taking a water hose and using one of those adjustable pressure heads. If you have that thing screwed on perfectly tight and increase the pressure...sure, you get the same flow out the end. Loosen that head a bit so the thread don't have a perfect seal. With the head completely open (least resistance), all your water will flow out without leaking at the threads.....increase the pressure by twisting that head closed and you'll get wet when that extra pressure causes water to come spraying out around the threaded connection. A fan right against a grill is similar...

I did not claim you get more CFM through your fan....I am saying you'll get more air pumped out of your case (in the area you want it removed.....near the CPU) without a grill. (assuming you have enough air getting pumped INTO the case or plenty of intake vents in the area).
What you say is true if and only if not all air being moved by the fan was making it out the back grill. You didn't specify that fact and simply claimed you got better airflow. And if that much air was escaping between the fan and the grill back into the case, then you had the fan mounted pretty poorly; I have yet to have this problem with my Armor.
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post #14 of 34
Thread Starter 
All I can say is - wow.
So I cut off the bottom Air intakes fan gaurd and then went ahead and cut off the top air exhausts fan gaurd.
Picture 1
Picture 2

And here is the fan attached:
Picture 3


The brown tape is only temp so please don't laugh
Just covering up some extremely sharp edges due to my lack of skills with a kitchen knife and computer cases

My Core temps have dropped around 3 Degrees at Load at Stock speed and my own voltage. I'm idling now at 32, 31, 26, 30 and load at around 37, 36, 33, 34 @ 2.66ghz @ 1.10v.


The Graphics cards now idle at 40 - 42 degrees, they were idling at 45 - 47.
Really happy this has had a decent affect on my system. I have an intake fan on the window of my case, going to try swapping that now to an exhaust for the Graphics Cards and see what difference that makes.
Will post back soon with results.
Edited by warnesey333 - 5/21/08 at 9:20am
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post #15 of 34
Thread Starter 
Oh and the lectures situation, Warwick uni - like to do 5 weeks of lectures before Exams It's very nice of them - means I have less revision time you see -.-
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post #16 of 34
Quote:
Originally Posted by warnesey333 View Post
Oh and the lectures situation, Warwick uni - like to do 5 weeks of lectures before Exams It's very nice of them - means I have less revision time you see -.-
Hmmm....nice idea, not ... lol.
I love ghetto mods. Trusty multipurpose kitchen knife .
post #17 of 34
Quote:
Originally Posted by stargate125645 View Post
And if that much air was escaping between the fan and the grill back into the case, then you had the fan mounted pretty poorly; I have yet to have this problem with my Armor.

I have a challenge for you. Go home and find a grill of some sort similar to what's on the back of your armor. Get a water hose. Spray that water at your grill. Tell me if all the water makes it to the other side. If not, you just just experienced restricted flow.... I'll bet money you end up with a significant portion of that water puddled on the ground below the grill. Same thing happens when you try to push air through a grill (minus the puddle part ).

You say you haven't experienced the "problem"....but you haven't cut your grill to experience the difference either. Those of us that have cut our grills can give some first hand experience, and it does make a difference. More air moved out of the case, and less noise....plain and simple.
Edited by RoadRashed - 5/21/08 at 9:53am
    
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post #18 of 34
Quote:
Originally Posted by warnesey333 View Post
All I can say is - wow.
So I cut off the bottom Air intakes fan gaurd and then went ahead and cut off the top air exhausts fan gaurd.
Picture 1
Picture 2

And here is the fan attached:
Picture 3


The brown tape is only temp so please don't laugh
Just covering up some extremely sharp edges due to my lack of skills with a kitchen knife and computer cases

My Core temps have dropped around 3 Degrees at Load at Stock speed and my own voltage. I'm idling now at 32, 31, 26, 30 and load at around 37, 36, 33, 34 @ 2.66ghz @ 1.10v.
.


You must have had your fan mounted "pretty poorly" in the first place if you are seeing that big of a difference.....
    
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post #19 of 34
Thread Starter 
I'll upload a picture of what was cut off when I change the window fan around.
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post #20 of 34
I want a pic of this kitchen knife! Lol

And removing fan grills does help. Both of my cases are grill naked
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