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Help determining why water flow has steadily decreased by 12% since finishing the build? - Page 3

post #21 of 31
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Quote:

+Rep
Thanks, that is a great spreadsheet! I hadnt noticed it when I've been on that site before. The result says I should be getting over double the 1.1-1.2GPM 3GPM and even with triple the amount of tubing, I should be getting 2.92GPM. Next I'll need to look at vertical climb, but still with 2 pumps, I know I've got to be screwing something up to get this result.
    
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post #22 of 31
The spreadsheet is "approximate"...since it does not include all blocks it's a bit of a game to pick the appropriate alternate block. In truth...anything over 1GPM works just fine and as Martin states...at some point increasing the speed of the pump adds too much pump heat negating the small savings you may get. Once you get to steady state the important deal is just to watch for changes.
post #23 of 31
Thread Starter 
Quote:
Originally Posted by FuzzDad View Post

The spreadsheet is "approximate"...since it does not include all blocks it's a bit of a game to pick the appropriate alternate block. In truth...anything over 1GPM works just fine and as Martin states...at some point increasing the speed of the pump adds too much pump heat negating the small savings you may get. Once you get to steady state the important deal is just to watch for changes.

I know, its just frustrating to have spent money on two pumps and achieve these results. I am sure I could do better, I'm just not sure how at the moment. I'll see how my temps are after overclocking and load testing and then decide if its worth fooling with things right now.
    
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post #24 of 31
Having two pumps in serial is a good thing if you've spent a boatload of money...at least you have some backup in case one fails. I have twin Koolance (laing) d5's....and get slightly better than 1GPM @12V and my O/C i7 (3.4) loop stays 7-9C above ambient at idle and never goes over 60-something at max (452x2 res/pump-cpu-mobo-120rad-gpu1-gpu2-240rad-360rad-back to pump/res). I run the GPU's in parallel and the pumps in serial.

Those are low but OK numbers and even if one pump fails I'll be good for a while (.9 GPM).
Edited by FuzzDad - 1/25/12 at 12:56pm
post #25 of 31
Have you tried just running the PUMP and the Meter without the rest of the system?
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post #26 of 31
Thread Starter 
Quote:
Originally Posted by ZealotKi11er View Post

Have you tried just running the PUMP and the Meter without the rest of the system?

No, but Im going to order more tubing tonight, as I'm going to have to check. As of right now I'm registering 215 LPH. I've been Prime95 blend and IBT testing an overclock between 4.8 and 5Ghz and temps havent gone above 58C yet (none have run longer than 20 min yet, but IBT gets hot quick at 20gb RAM). This constant drop in flow has got to be a meter or pump issue at this point. If it was a consistent number I'd at least have some peace of mind, but as it is now, I need to find out what is going on.
    
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post #27 of 31
Thread Starter 
I had to reboot the computer a few times today after my bios and OC started throwing fits. After resolving this, I noticed that my flow is now in the 280s again and has been for a few hours. I just ordered a new pump today too, after feeling the non-variable pump and notice there was so much less vibration than the variable model, I figured it had a bad motor, hence my declining flow rate.

Im starting to wonder if Ive entered the twilight zone....
    
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post #28 of 31
Quote:
Originally Posted by jc1234 View Post

I had to reboot the computer a few times today after my bios and OC started throwing fits. After resolving this, I noticed that my flow is now in the 280s again and has been for a few hours. I just ordered a new pump today too, after feeling the non-variable pump and notice there was so much less vibration than the variable model, I figured it had a bad motor, hence my declining flow rate.
Im starting to wonder if Ive entered the twilight zone....

The variable D5 when set to speed 5 has more pumping power than the non-variable pump, to be able to compare the two you must set the variable pump to speed 4 since the non-variable pump performs as if it were set on speed setting 4.
post #29 of 31
Thread Starter 
Just wanted to post a follow-up. After ripping apart and putting my loop back together in different configurations about 10 times, my flow rate continued to decrease. I started to notice what sounded like air in my mcp655-b pump and my flow rate decreased to around .5gpm, which is horrible for 2 pumps IMO. I bit the bullet and ordered a new variable mcp655. I have yet to take an in depth look at my at the -b, but i will get around to it. Anyway, the new pump and a new loop configuration that eliminated 3 or 4 tight bends by put the rad on the same side of the case as the cpu gained me .3gpm, which was much less than expected.

I began to test flow at every connection point and sure enough, the two pumps and res in a closed loop were giving me around 3.3gpm and the full loop without the cpu block was 3gpm. However as soon as the CPU block was connected, I was loosing 2.2gpm . After ripping the loop apart yet again I FINALLY found an obstruction in the cpu block. I had looked at the block at least 3 or 4 times, but must of missed it in the past, even with a flashlight. There was a tiny bit of teflon tape that must have been causing a serious blockage. I was able to get the teflon tape out with some small picks and the last bit was removed with my wet dry vac on the blow setting. After a few rinses of the loop and checking to make sure that no threads had any excess tape I put the loop back together and I am now up from .8gpm to 1.8gpm.

I had to tear down the entire system in the process, since drives and cables all had to be relocated, so im still in the process of putting it back together, but at least I know what the issue was, as it was driving my crazy. I need to get an angled mirror like dentists use to get a better view inside the block in the future in case I noticed flow decrease again.
    
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post #30 of 31
Yeah that will about do it... But why would you be using Teflon tape on your water loop? Everything hooks up with G1/4 fittings w/ o-rings? Do you have an older rad that uses NPT fittings or something? headscratch.gif
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