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Negative and Positive pressure within a loop

post #1 of 11
Thread Starter 
So I've noticed that the coolant level in my T-line drops with I turn my machine on. It then returns back to its normal level when the machine is off. I have the danger den fill-port thing on top of my T-line so I am pretty sure its air tight. So I would assume if its air tight and the fluid level drops that would create a negative pressure situation. Does this make the pump work harder? Would this affect my temps in anyway?

Now for part two: I can turn the machine on and remove the screw to the fill port, and then put a little more coolant into the T-line. I fear that this would end up messy when I turn the machine off and the remaining air in the line would come under a positive pressure, potentially wrecking havoc on one of my connections.

Did all of that make sense?
What do you guys think?
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post #2 of 11
turn the comp off... fill the T line with coolant but leave an empty space of 2-3 inches from the fill port

with the fill port still open, turn on the comp, the water level should drop a little, now plug up the fill port
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post #3 of 11
Thread Starter 
Thanks for the answer. That is exactly what I have done. Yet I still see the coolant level drop...Which is what made me start pondering the negative positive thing.
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post #4 of 11
mine does the same thing . . the T-line level drops ~ 1/2" or so when I turn it on and goes back to normal when I turn it off . . .
 
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post #5 of 11
Thread Starter 
Wow thats it. My coolant level drops a good three inches when the comp is powered on.
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post #6 of 11
Can you take a pic of your loop so that everyone can get a better idea of what it looks like ?

Order of components, heights compared to one another, pinch-points, etc etc.
post #7 of 11
The pressure is fine. If you seal the T-line when the comp is on it will have positive pressure in the top of the T-line when the computer's off. This positive pressure will be equal to the pressure put into the loop by the pump when the computer is on. Seal the T-line when the comp is off and you'll have negative pressure in the top of the T.

Neither matters greatly. You don't have to cap off your fill port. Just make sure it's full enough so that when it does drop it does not introduce air into the loop.

Quote:
Originally Posted by ecotec View Post
Wow thats it. My coolant level drops a good three inches when the comp is powered on.
It will vary depending on the pump. DDC's generate more pressure than 655's, DB-1's, etc.
    
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post #8 of 11
Quote:
Originally Posted by RonindeBeatrice View Post
The pressure is fine. If you seal the T-line when the comp is on it will have positive pressure in the top of the T-line when the computer's off. This positive pressure will be equal to the pressure put into the loop by the pump when the computer is on. Seal the T-line when the comp is off and you'll have negative pressure in the top of the T.

Neither matters greatly. You don't have to cap off your fill port. Just make sure it's full enough so that when it does drop it does not introduce air into the loop.



It will vary depending on the pump. DDC's generate more pressure than 655's, DB-1's, etc.
I also have alot of vertical play in my loop . . .alot of tubing all together actually.
 
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post #9 of 11
Thread Starter 
Quote:
Originally Posted by CrazyJoe View Post
Can you take a pic of your loop so that everyone can get a better idea of what it looks like ?

Order of components, heights compared to one another, pinch-points, etc etc.
Here is a pic I posted a while ago. I have since moved the rad to the top of the box, but the internal plumbing remains the same.
Attachment 66912

Thanks Roninde for your reply
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post #10 of 11
Thats just your pump suction pulling it down is all, as long as you know your fil-port is sealed...It would be kind of hard not to have it sealed with the big o-ring in it......I like the brass ones i use them as drain-line caps most of the time...
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