Can coolant effect pump noise???

[Kushiro]

Hi guys,

So I realize that this question seems a bit odd, however basically my D5 vario pump from XSPC used to create this loud and extremely anoying humming noise what operating.

Now heres the odd thing, I decided to try out the EK-UV blue coolant that I purchased a while back, so I filled my loop with it on when I turned my pc on to my surprise the anoying humming noise was reduced, still there but reduced.

So basically what I would like to know is this:

-Has anyone had this experince before?
-what rpm readings should you be getting from the pump?
-Is the humming noise simply due to vibration in the coolant?
-What are some good resevoir suggestions for my to mount my D5 pump to? I do not have a pump top, only the bare pump and screw ring, as I got it as a res/pump combo

One last thing, I used to just use distilled water with a piece of kill coil inside the inlet tube.

 

[Shaw]

Very odd indeed. Did you remove the pump from the system at all during the process of changing fluid? It sounds like you've better dampened the vibrations when you changed the fluid.

 

[RadeonHDx]

Is there a chance that you hadn't correctly bled the pump or something? Maybe air bubbles in the pump were effecting the vibrations and noise?

 

[Remmy]

Theoretically the pump noise definitely depends on the viscosity of the fluid flowing through it; have you ever heard the difference between the pump with liquid going through it, and the pump with air (air is a fluid) going through it? The difference is huge. Different coolants would probably make such a tiny difference though because their viscosities won't vary that much around a common value anyway. It was probably to do with air bubbles in the previous loop, or better dampening this time around.

 

[Kushiro]

Sorry for the late reply guys, Anyways my loop definitely didnt have any air bubbles and was completely full give or take a few ml at the top of my res, also everything was left untouched, only the coolant was changed.

Also yes I have heard the difference between fluid going through the pump and air bubbles, and I can tell you that it is not what I was hearing.

Basically the humming noise I believe is coming from the pump itself and is resonating/transferring to the coolant. The humming noise is still there, however it is just a bit better.

So has nobody ever had this experience before? I know it seems really odd.

EDIT:

Just 2 more things-

1. I am using an XSPC dual bay D5 res/pump combo
2. is there any ways to reduce my pumps noise? as the humming noise seems to be due to the vibration of the pump

 

[mArTyN]

This may be a daft question, but, is the bay res' fixed securely in place ?
I only ask because I also run the same piece of kit and It makes no noise ( D5 flow rate set to 2 ).

 

[BigDaddyKong]

Mine makes noise on 3, but if I turn it down to 2, it silent. I am running the smae res, but with 2 pumps.

Just found out tonight, its air in the system. I have to flip my flow meter, and I started watching my flow and playing with settings. For some reason, I decide to tip my rig back one more time. It sounded like a screw falling through the case, and sliding on the case floor when the bubble came out. After that, dead silence on all speeds.

 

[Kushiro]

Yes, I have definately made sure that it is and was screwed in securely, unfortunately it still makes that humming noise.

 

[SuB]

what was the previous coolant?

some coolants have more/less glycol in them which can change the viscosity so a coolant could theoretically change the noise the pump makes yes.

 

[Kushiro]

I previously used just plain distilled water and a kill coil for my loop.

 

[SuB]

Ek coolant has glycol in it I believe, so it makes sense that it could change the amount of noise

 

[Kushiro]

I see, I guess that makes sense (I have no idea what glycol is haha, will check) anyways thanks for letting me know.

 

[SuB]

It's alcohol effectively

 

[Kushiro]

haha yea cheers, and once again thanks for the help!!

 

[BigDaddyKong]

How full is your res? I still think its air somewhere that is stuck and can't circulate.

 

[SuB]

How full is your res? I still think its air somewhere that is stuck and can't circulate.

unless it's a very badly designed res, or it's installed incorrectly, a little air in it shouldn't cause pump noise if the loop is bled properly. There's always going to be a tiny bubble of air in there either way.

 

[BigDaddyKong]

There actually needs to be a slight air gap in the top of the res from what I have seen. That's why I had trouble, I had it overfilled not giving any trapped air no place to go. It took me a week to find this, and only after I lowered my water level by just an ounce, when I flipped my flow sensor did I find this out. I had my bay res filled all the way to the top with absolutely no airspace left inside.

 

[Kushiro]

I can assure you that there is absolutely no air bubbles in my loop, I left the cap open during the leaktest phase as I assemble it in an extremely clean room with all air filtered (granted the air is still contaminating, however I am pretty sure it wont do any damage) after I made sure there were no leaks and air I filled it up completely.