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How to get rid of pump noise?

post #1 of 15
Thread Starter 
Hi, OCN'ers, I have a problem, bothering me - My pump is insanely loud.

If you check my rig, I have built it on budget, and managed to put everything together under 200$! So, as you probably have guessed - the pump is not of a familiar brand.

The pump by itself is not classified silent, but it says in description, that it is supposed to emit ~25dB of noise (pretty much the same, comparing with Danger Den, Antec, XSPC, Swiftec and other pumps). In reality, it is always as loud as a phone, left vibrating on the table. gunner2.gif

I have tried to run it in 2 ways:
  1. powered by a standard 4-pin molex (12V)
  2. plugging it in cpu_fan socket on motherboard (it has 3-pin plug too), as it's suppoed to adjust motor's speed accordingly to CPU temperature.
None of these theories works for me, it performs the same, no matter where I plug it.

I am at my workplace now, and I am wondering - how this pump would perform, if I rewired molex plug, so the pump drew 5V instead of 12V?
  • Would it's head drop dramatically?
  • In what scale would this undervoltage make impact on the waterflow?

Any ideas? What else can I do in this case? (Buying new pump is the last thing I'd do winksmiley.jpg )

Thanks in advance
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The Snow White
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post #2 of 15
Quote:
Originally Posted by DVIELIS View Post

Hi, OCN'ers, I have a problem, bothering me - My pump is insanely loud.

If you check my rig, I have built it on budget, and managed to put everything together under 200$! So, as you probably have guessed - the pump is not of a familiar brand.

The pump by itself is not classified silent, but it says in description, that it is supposed to emit ~25dB of noise (pretty much the same, comparing with Danger Den, Antec, XSPC, Swiftec and other pumps). In reality, it is always as loud as a phone, left vibrating on the table. gunner2.gif

I have tried to run it in 2 ways:
  1. powered by a standard 4-pin molex (12V)
  2. plugging it in cpu_fan socket on motherboard (it has 3-pin plug too), as it's suppoed to adjust motor's speed accordingly to CPU temperature.
None of these theories works for me, it performs the same, no matter where I plug it.

I am at my workplace now, and I am wondering - how this pump would perform, if I rewired molex plug, so the pump drew 5V instead of 12V?
  • Would it's head drop dramatically?
  • In what scale would this undervoltage make impact on the waterflow?

Any ideas? What else can I do in this case? (Buying new pump is the last thing I'd do winksmiley.jpg )

Thanks in advance

Well, where is the pump located? is it part of a bay res? or just sitting on the bottom of your case? You need to decouple it from your case something like[URL=http://] THE SHOGGY SANDWICH should work to reduce the vibration going into the case.

As to your 2nd question, no it would not work well, depending on your pump it may not even work at all. Depends on the operation range of the pump itself.
post #3 of 15

Undervolt that sucker.


What's the rated RPM ?

post #4 of 15
Thread Starter 
It is a seperate 12V 14W pump, 600l/h, 5m head. It is sitting at the very base of the case ( turns out I'm a rapper biggrin.gif ), and it already has a rubber pads, so vibration can not be the cause.

Undervoltage could work, becasue the pump is just a brushless motor, equipped with a turbine to move the liquid. Undervolting causes it to drop rpm (including noise) and rated power. That's why I wary to use this approach - I am afraid the decreased power will not be enough to effectively circulate the liquid.
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The Snow White
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post #5 of 15
Thread Starter 
I will try it, when I return home. I don't know pump's rated RPM, no info about that. I guess that's another reason I should try this approach - maybe even with a dropped rpm it will operate somewhat effective. It's head will drop dramatically, I suppose, but I have maybe 2-3meters of head, not more.
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post #6 of 15
Thread Starter 
SO...
I took a molex male-to-female extender cable and resoldered wires, so the pump took 5V instead of 12V.

It is grave silent and flow seems to be very good thumb.gif
I guess it counts as a success wheee.gif
The Snow White
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post #7 of 15
Quote:
Originally Posted by DVIELIS View Post

SO...
I took a molex male-to-female extender cable and resoldered wires, so the pump took 5V instead of 12V.

It is grave silent and flow seems to be very good thumb.gif
I guess it counts as a success wheee.gif

 

 Told ya 

:D

Glad you got it figured out.

post #8 of 15
A pump rated for 25dBa should be near silent to begin with. 32dBa is just barely noticeable.

Hey, if you ever need to get more flow from that pump down the road, rewire that end connector back to 12VDC and use a fan speed controller that is rated around 15-20W per channel.

Also, if you upgrade to more flow restrictive parts in the loop, that pump flow rate it very pitiful. For now, you should be fine as you had stated. If you are like any of us, we keep tweaking the loop always trying to get bigger and better. BUT, that isn't always the answer. haha
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post #9 of 15
Thread Starter 
I already thought about that. I could use a fan controller to controll my case fans + pump speed smile.gif
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post #10 of 15
Quote:
Originally Posted by splinterize View Post

Quote:
Originally Posted by DVIELIS View Post

SO...

I took a molex male-to-female extender cable and resoldered wires, so the pump took 5V instead of 12V.

It is grave silent and flow seems to be very good thumb.gif

I guess it counts as a success wheee.gif

 Told ya 
biggrin.gif


Glad you got it figured out.

7v might be the better route... 5v is pretty low.



+ goes to the yellow and - goes to the red. If you want to create a switch to go between 7v and 12v then you have it switch between the red and the black next to the yellow.
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