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[Martinsliquidlab.org] Pump Noise Testing Round 1 - Page 2

post #11 of 35
Any chance of seeing whether or not insulating a DDC heats it up or not? If it's cooled by the coolant, it could be made even quieter.

I ask because I have to question the claim of DDC's needing airflow when Watercool makes an insulating case for the DDC (both with and without a top inlet hole), and I doubt they would make something like that if it caused pumps to fail.
Edited by Phos - 3/18/11 at 1:49am
    
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post #12 of 35
Thread Starter 
Quote:
Originally Posted by cmeeks View Post
Oooh, I have several suggestions! Hear me out on this...

I would like to see more standardized testing with dual radiators, especially the 140mm variant - 35mm and 55mm radiators. Do it all with a standardized fan that can be found in both a 120mm variant and a 140mm variant. What I'm curious to see is what kind of cooling you can achieve without requiring a freaking Corsair 800D to fit the monster.

example fan options:
Aerocool Shark 120/140
Noiseblocker 120/140
Yate Loon D12SM-12/D14SM-12

preferably the aerocool shark because if I'm not mistaken, it has what appears to be a good balance of pressure, noise, and price.

And for my own personal interests - the Phobya 200 radiator because there is absolutely no solid info on it. Actually, it's all for my own personal interests . Thanks Martin!
Good ideas, I'll think about it. I have several ideas on improving my old radiator testing setup that I'd like to explore and that could include making a template interchangable bench to test a variety of radiator sizes

Quote:
Originally Posted by SecrtAgentMan View Post
Thanks for this Martin
You bet!

Quote:
Originally Posted by Phos View Post
Any chance of seeing whether or not insulating a DDC heats it up or not? If it's cooled by the coolant, it could be made even quieter.

I ask because I have to question the claim of DDC's needing airflow when Watercool makes an insulating case for the DDC (both with and without a top inlet hole), and I doubt they would make something like that if it caused pumps to fail.
I know both the DDC and D5 series receive cooling by the pump housing, but the D5 is metal and the DDC is plastic. That's why the D5s stay so much cooler. It's a good to do item, but I'm not sure I can access getting a temp probe on the critical parts. I suspect the hottest points are the FETs on top of the PCB which is impossible to get to without desoldering the windings. I'm not that good at soldering so I'm not sure I want to risk it.

I have measured the plastic base of the 18W models reading 50-60C even sitting in open air though. They do get hot, not sure it's necessary, but I also generally like to allow some air flow over the base. I'm not sure...maybe I can figure something out.
    
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post #13 of 35
Quote:
Originally Posted by Martinm210 View Post
I have measured the plastic base of the 18W models reading 50-60C even sitting in open air though. They do get hot, not sure it's necessary, but I also generally like to allow some air flow over the base. I'm not sure...maybe I can figure something out.
I've been using the soft HDD grommets to isolate the DDC pump noise with great success. This also allows for air to flow under the pump when it's raised by the grommets.
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post #14 of 35
Martin,

A quick question, is it possible to test the DDC-1 with the stock cover? It's rated at under 34dBa measured at a 2ft distance.

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post #15 of 35
would love if you did rads, especaillly a comparison of the same series and the decrease in flow by % compared to others in the line, ie 1vs2vs3
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post #16 of 35
Thread Starter 
Quote:
Originally Posted by bmaverick View Post
Martin,

A quick question, is it possible to test the DDC-1 with the stock cover? It's rated at under 34dBa measured at a 2ft distance.

I could try it, but I suspect noise will be higher because of the reduced efficiency and thinner top. Rated numbers are mathematically calculated/corrected for 0 dbA ambient and will always be lower than actual with ambient noise present.

Quote:
Originally Posted by JohnDProb View Post
would love if you did rads, especaillly a comparison of the same series and the decrease in flow by % compared to others in the line, ie 1vs2vs3
Yeah, I ordered a pile of temperature sensors that should be here in a couple of weeks.

Quote:
Originally Posted by bmaverick View Post
I've been using the soft HDD grommets to isolate the DDC pump noise with great success. This also allows for air to flow under the pump when it's raised by the grommets.
Got any links to the grommets you like?
    
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post #17 of 35
Quote:
Originally Posted by Martinm210 View Post
Got any links to the grommets you like?
Bummer, I should have sent you a few sets, but didn't think about it.

HDD grommets like these offer help to reduce the noise to the case transfer. When applying them, it's best not to torque them too tight. Mainly the pump needs to rest onto the grommet ribbing.

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post #18 of 35
Thread Starter 
Quote:
Originally Posted by bmaverick View Post
Bummer, I should have sent you a few sets, but didn't think about it.

HDD grommets like these offer help to reduce the noise to the case transfer. When applying them, it's best not to torque them too tight. Mainly the pump needs to rest onto the grommet ribbing.

I'll see if I can round some up at the hardware store, I've got a pretty good bolts place nearby that generally has most of what I could want.

So I'm assuming you bolt a plate to the base, then use these on all four corners?
    
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post #19 of 35
Quote:
Originally Posted by Martinm210 View Post
I'll see if I can round some up at the hardware store, I've got a pretty good bolts place nearby that generally has most of what I could want.

So I'm assuming you bolt a plate to the base, then use these on all four corners?
Well, for the DDC-1 I have, I just screw them into the two base holes. The retail versions have the flanges. For them, you will need a big enough grommet to fill the hole/slots to isolate them. The softer the durometer of the grommets, the quieter the pumps are, but the weaker the grommets are for support. A 40 Shore-A durometer may be your best bet. Most are blue in color. The black are not as soft.

Or use 3/8" thick foam washers from Walmart or a craft store.
Edited by bmaverick - 3/23/11 at 11:11am
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post #20 of 35
Thanks for the ideas Bmaverick and Martin. I think I have a plan for installing a MCP35X in the future... it's really the culmination of several ideas.

Idea 1 (heatsinks on bottom of pump - helps to cool the pump):


Idea 2 (inlet/downtube mod - helps to bleed the pump and keep air out of the system):


Idea 3 (HDD grommets - helps to silent the system):


In addition to these ideas, connect the downtube directly to the pump inlet and hang the system from an L-shaped bracket. Like this:



Of course it would be a little more difficult to prime the pump... But the plus side is that it should be even easier to bleed
Edited by cmeeks - 3/23/11 at 2:07pm
    
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