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Some D5 Pumps are different than Original Laing

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post #21 of 42 (permalink) Unread 05-06-2019, 03:44 AM
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This forum is weird with photos....give me more time and i will try to put them here again..since im working now.

Sorry the OFF.

P.S. I think now its ok!

Last edited by Mordorr; 05-06-2019 at 03:51 AM.
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post #22 of 42 (permalink) Unread 05-06-2019, 03:49 AM
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Just balance weights. You can find several images across the net where they are in the impeller. In the video he notes that the difference is the ek's sticks up so it was just a bad balance job imo. Not enough to interfere with the tolerances of the stock top but enough to rub against the tighter tolerances of the custom job.

I doubt EK does their own balancing so I wouldn't even put the blame in their court. It would have been a more interesting story if they had put the pump in for a replacement and the next one had the same issue then you could say they might be sourcing second rate impellers. As is I'd file this in the "something to be aware of" category.

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Last edited by ryan92084; 05-06-2019 at 03:54 AM.
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post #23 of 42 (permalink) Unread 05-06-2019, 09:56 AM
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OFFTOPIC:

Can someone tell me how to put here photos? Everting i try fails miserably...
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post #24 of 42 (permalink) Unread 05-06-2019, 10:12 AM
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Quote: Originally Posted by Mordorr View Post
OFFTOPIC:

Can someone tell me how to put here photos? Everting i try fails miserably...


Usually you drag pics from your PC into the post and it should upload it. I’m using TapaTalk app on phone and I can add pics as well.


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post #25 of 42 (permalink) Unread 05-06-2019, 10:52 AM
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post #26 of 42 (permalink) Unread 05-07-2019, 06:17 PM
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As has been mentioned earlier the metal dots on the impeller are balance weights, just like the small lead weights that are placed on car wheels to balance them. They have always been a fundamental part of the design even before the D5 existed, in the d4 generation pumps. Every impeller has them in different places and number, installed by Xylem.

Without being able to examine the pump it's impossible to know what the problem actually is.

If old mate in the video has never seen balance weights before and could not tell that all the pumps in front of him have them then I can't say that gives me much confidence in any analysis he might provide.

Last edited by Ashcroft; 05-07-2019 at 06:26 PM.
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post #27 of 42 (permalink) Unread 05-07-2019, 06:58 PM
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Quote: Originally Posted by Ashcroft View Post
As has been mentioned earlier the metal dots on the impeller are balance weights, just like the small lead weights that are placed on car wheels to balance them. They have always been a fundamental part of the design even before the D5 existed, in the d4 generation pumps. Every impeller has them in different places and number, installed by Xylem.

Without being able to examine the pump it's impossible to know what the problem actually is.

If old mate in the video has never seen balance weights before and could not tell that all the pumps in front of him have them then I can't say that gives me much confidence in any analysis he might provide.
What I found odd is that he could have swapped the impeller with any of the D5 pumps he had to test it for imbalance/vibration. If the pump no longer made the noise then I would assume the impeller was out of balance. But I think he's making these reservoirs without any specs from Laing/Xylem/Lowara and probably had the machine clearance too tight.

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post #28 of 42 (permalink) Unread 05-07-2019, 07:15 PM
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Its almost definitely a tolerance problem. I'm sure if the pump was placed in a factory Laing/Xylem housing it would have no problem. There is some variation in all manufacturing.

Pump volutes may seem pretty simple, just in at the centre and out at the edge, but Laing no doubt spent a lot of money and development time to produce the factory top.
Unlike most pumps that have a shaft to steady the impeller, the hemispherical pump impellers float with no contact with the pump body. So only the magnetic field and the dynamics of the fluid flow keep the impeller steady. That makes it a system that is extra sensitive to changes in the volute shape.

As far as the electronics of the pump goes, all D5 pumps are PWM speed controlled. Its just not the Intel standard of PWM.
The Vario model just uses a dial to adjust the inbuilt PWM.
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post #29 of 42 (permalink) Unread 05-08-2019, 03:09 AM
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As far i can tell, (only few hours before install my system) my propeller didn`t touch any part of the pump except the center ball in the middle...

Im sure with Heatkiller case, they made a good measure of tolerances and propeller don`t touch the case where is installed...

So far no issues......(Waterclooler D5 Vario).
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post #30 of 42 (permalink) Unread 05-08-2019, 02:43 PM
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Quote: Originally Posted by Mordorr View Post
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P.S Thank you
You are welcome.

Nice build, and nice jurassic Corsair Power Supply (I'm sure it still is a great quiet power supply even nowadays!).

Some doubts:

Which to choose (aiming quietness)?

Aqua Computer D5 pump motor with PWM input and speed signal or Watercool WCP D5-PWM (I really wish PWM)?

Bitspower Dual D5 MOD TOP EXTREME (Acrylic Version) or EKWB EK-XTOP Revo Dual D5 Serial?

If I choose the Bitspower's, what fitting shall I use since its threads are G3/8 instead the standard G1/4 (for hose)?

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