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Is this normal Humming sound from D5 Next?

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Norlig

Newbie

Is this normal Humming sound from D5 Next?

Wednesday, November 4th 2020, 1:49pm

Hi,

I bought a D5 Next pump recently, and installed it yesterday.
(I was annoyed with my old D5 Vario could only run at 1 speed all the time unless I opened my case to turn the red dial)

The new Pump has a high pitched "hum" that is more audible than my old pump for some reason.
I kept my old pump at 50%, this one is more "annoying" (though probably makes less sound in dB), mainly due to the high pitched hum.

Video here: https://norlig.no/vid/D5_Next_HighFrequencyHum.mp4
Video with fans off: https://norlig.no/vid/D5_Next_HighFreque…_(fans_off).mp4

Can I get a comparison or evaluation from a few other owners on here?

cheers

This post has been edited 1 times, last edit by "Norlig" (Nov 4th 2020, 1:53pm)

Tanquen

Junior Member

Thursday, November 5th 2020, 4:27am

I just got the D5 Next a few weeks ago, mine is the same or worse. Yours is at head level so not helping. Mine is back behind me on the floor and it bugs me more than the 8 year old base D5 with a red dial. :( It seems to be worse at the lower speeds. I think you have to give up on the cool factor of having it spin up or down to match temp and find the speed that is the least annoying. I should have just kept the old pump? The flow reading also doesn’t work and I already had a A6 and a temp sensor. Kinda bummed. Mine also sets on a gel pad and I was wondering it that made it worse but after seeing yours am not so sure.

I even have the same top as you. I wonder if a newer solid copper one would be less annoying?

Old D5 was a Laing Thermotech LMB15107972 D5-38/810N.

This post has been edited 3 times, last edit by "Tanquen" (Nov 5th 2020, 4:34pm)

Tasky

Full Member

Thursday, November 5th 2020, 5:00am

Mine makes a similar noise, but without the high-pitched element.

It's like a vacuum cleaner starting up, but so quiet you'd think it's 2-3 streets away.

I can barely hear it behind the noise of my hard drive and fans.

Also, it sounds like you have a lot of air in your loop. The D5 bearing needs to be fully submerged in water, so perhaps you're getting extra noise from the little bubbles?

Taubenhaucher

God

Thursday, November 5th 2020, 6:26am

You have to remember one thing, the D5NEXT is a D5 pump, Aquacomputer did not change anything on the pump, but added a controller, the mechanics remain the same!
The pumps are manufactured by Lowara/Xylem.
If a D5 is "loud" the reasons are impurities, air in the circuit, turbulence in the top or vibrations.

The pump has only one moving part see also here .
I think you will find it in English, but the picture speaks for itself.

Translated with www.DeepL.com/Translator (free version)
Es gibt keinen Ausweg, den ein Mensch nicht beschreitet, um die tatsächliche Arbeit des Denkens zu vermeiden.
Thomas Alva Edison (1847-1931), amerik. Erfinder

k2viper

Full Member

Thursday, November 5th 2020, 5:45pm

Well, it is still an open question why do some blame aquacomputer if having their pump noisy.


What do I see, is that likely pump is hardly mounted to the case, no soft rubber standoffs, no any anti-vibration mounts (and mounted to a thin, honeycomb resonating floor plate). Averagely restrictive loop (based on pump's power draw numbers), and likely distilled used as coolant.

Generally there are known rules what can make ANY pump less bothering:

- good anti-vibration mount, the more the better, in my case I added additional rubber standoffs even to "good" EK and AQ ULTITOP antivibration mounts - stock was not enough to me;
- build a loop with less restriction, more restriction will make any pump louder then it may be in a less restrictive loop;
- use glycol-based coolants instead of distilled;

This post has been edited 1 times, last edit by "k2viper" (Nov 5th 2020, 5:48pm)

k2viper

Full Member

Friday, November 6th 2020, 8:18am

Also it's always better if reservoir that feeds pump, is located above the pump's inlet, so coolant will have some additional velocity entering the pump.
Glycol based coolants are gererally more viscous, thus affecting pump's noise.

Norlig

Newbie

Monday, November 9th 2020, 7:43pm

working on getting the pump mounted to the front radiator, and will move the reservioir above it, mounted to the front of the case.

made an adapter plate earlier today:


(test fitting)




This post has been edited 2 times, last edit by "Norlig" (Nov 9th 2020, 7:45pm)

k2viper

Full Member

Tuesday, November 10th 2020, 7:52am

Looks like again you plan to hard mount the pump to something. Good vibration dampening is a key to low noise operation. Add antivibration standoffs, I recommend to fit your adapter plate on these standoffs (choose appropriate size) and mount D5 NEXT pump through its stock "fat" silicone damper to black plate on your second pic.

Norlig

Newbie

Tuesday, November 10th 2020, 2:02pm

Quoted from "k2viper"

Looks like again you plan to hard mount the pump to something. Good vibration dampening is a key to low noise operation. Add antivibration standoffs, I recommend to fit your adapter plate on these standoffs (choose appropriate size) and mount D5 NEXT pump through its stock "fat" silicone damper to black plate on your second pic.
I will mount the bracket using some rubber in between the bracket and the radiator, but if I can still notice some vibration or similiar; I will look into those mounts.

thanks for the link

k2viper

Full Member

Tuesday, November 10th 2020, 2:37pm

I bet "some rubber" is not enough, especially when screws are still rigidly holding the bracket.

But, why should I insist. Everyone is looking for his own way to make it, right? :D

Norlig

Newbie

Thursday, November 12th 2020, 11:13am

Alot better now

This post has been edited 2 times, last edit by "Norlig" (Nov 12th 2020, 11:14am)

k2viper

Full Member

Thursday, November 12th 2020, 3:07pm

As I said, anti-vibration efforts are the key to low noise operation )
Congrats.

ND1

Junior Member

Thursday, February 11th 2021, 2:14pm

I have D5 Next pump and Watercool Heatkiller Tube reservoir, which has brackets with antivibration rubber. Same awful noise. I can hear at 0% power output (2000 rpm). Pump do not stands on any surface, just attached to reservoir.

k2viper

Full Member

Thursday, February 11th 2021, 3:00pm

I bet there is not enough rubber.

Kuminauha

Junior Member

Thursday, February 11th 2021, 5:53pm

My aliexpress noname D5 is dead silent with EK revo res & mount & cryofuel clear premix as a coolant.

This post has been edited 2 times, last edit by "Kuminauha" (Feb 11th 2021, 5:55pm)

Taubenhaucher

God

Thursday, February 11th 2021, 6:15pm

The D5 is a pump from Lowara/Xylem.
So there can hardly be a no name D5 :)
If it is a fake, you should probably not compare the two pumps.
Es gibt keinen Ausweg, den ein Mensch nicht beschreitet, um die tatsächliche Arbeit des Denkens zu vermeiden.
Thomas Alva Edison (1847-1931), amerik. Erfinder

k2viper

Full Member

Thursday, February 11th 2021, 7:35pm

Aliexpress "chinese D5" (bykski/barrow/etc) PWM 18W D5-like pump is not a D5. It is simplified for cheapening clone/copy in mounting dimensions of original D5.

It is less powerful then original, has plastic working chamber instead of stainless (original) and cheaper electronics circuit.
Though, original D5 (Lowara) pums still can be found on Aliexpress, they are original.

Bartdude

Full Member

Friday, February 12th 2021, 6:58am

Twin D5 using Duel Revo, all EK. Never heard any sound from my pumps, good anti vibration :)
Bartdude has attached the following file:
  • pumps.jpg (595.6 kB - 151 times downloaded - Last download: Aug 1st 2025, 4:25am)
"no shit lady, does it sound like i'm ordering pizza?"

Kuminauha

Junior Member

Friday, February 12th 2021, 7:34am

https://www.aliexpress.com/item/32731216….27424c4d5WmT7b

This is the one I was talking about. Seems to be a copy. The imperrel is metal but the cup or housing is made from delrin or similar material.

This post has been edited 2 times, last edit by "Kuminauha" (Feb 12th 2021, 7:39am)

k2viper

Full Member

Friday, February 12th 2021, 8:26am

Quoted from "Bartdude"

Twin D5 using Duel Revo, all EK. Never heard any sound from my pumps, good anti vibration
EK Revo mount is one of the best on the market, if not the best D5 mount in case of anti-vibration. I have EK D5 combo res with such mount, it is queit, though I still managed to make additional antivibration rubber standoffs between Revo mount and case panel its mounted on. There is never too much antivibration :)
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