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More pump noise testing and video

post #1 of 5
Thread Starter 
Also posted on my new blog site, but here is the summary:

ROUND 2 MCP 35X has been added

This was adding in the Swiftech MCP-35X+Reservoir combo to see both how the PWM handles range, but more specifically to see how the reservoir weight changes the results. Here are the charted results:

1″ FOAM DECOUPLER
For those that insist on the absolute lowest noise, you’ll need to find a good way to decouple the pump from any direct metal or solid contact. I used a piece of eggcrate as my test case, although there are a variety of alternatives. The more “Free Floating†the pump is from the case, the better.


1" Egg-Crate Foam Decoupler


The DDC series pumps are performing slightly better with their aftermarket tops, and the 1″ foam decoupler is most effective with the lighter weight unit. It should also be noted the amazing range that PWM is offering the MCP-35X. The 35X takes the crown for lowest possible noise although that is a very small amount of pumping power. For medium to high settings loosing the reservoir allows the foam decoupler to work a bit better.

The other apparent trend is the rise in noise levels from medium speeds to high speeds. There is fairly minor benefits going much slower than about medium speed, but very good gains going from high to medium on all of the pumps.

DIRECT METAL CONTACT
This is for those that are not all that concerned with pump noise and perhaps either directly bolt the pump down, or have very minimal decoupling. I allowed the pump to sit directly on sheet metal as is without any foam decoupling.




The direct contact results seem to tell a few different things. While the weight of the reservoir of the 35X may have been making the foam decoupler less effective, it’s also serving to assist in keeping noise vibrations in check much better than the lighter top only pumps when in direct metal contact. Mass/weight alone does appear to have some benefit to reducing vibration transfer noises. The other interesting trend with the direct contact is the undulating “Harmonics†results. This will obviously depend on the exact installation, but in a solid type installation it appears there would be benefit to “tuning†the rpm and avoid those peaks as much as possible. I would also suggest reservoirs and high mass in instances where pump decoupling isn’t being used, that appears to be another benefit.

VIDEO
And here is the video including the 35X comparison to the previous two pumps tested so far:

You might notice I had a small leak from the side plugs in the 35X test that took me a while to notice (I forgot to tighten the top plug). Whoops! I fixed it in the middle of the test.


Obviously next on my list is to test the 35X without the reservoir. Theoretically without the reservoir weight, it should equal the PMP-400+top results except have that added PWM extra range. I've also got the PMP450S and a need to test the PMP450 with COV-RP450 top to see if there is some noise benefit to the stock vs top element.

Cheers!
Martin
    
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post #2 of 5
I suspect that it's not the extra weight but that the reservoir itself is vibrating, though I'm not sure how to test this. I guess just touch the sheet metal bit to see if it's vibrating?

I'd also like to see if the stock top results in more noise than an aftermarket top. It's pretty thin and seems to transfer noise readily.
    
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post #3 of 5
Thread Starter 
That could be, or perhaps the top thickness also makes a small difference. The Koolance top is about an inch thick which is that way because a reservoir can thread into it. I'll try testing the 35X without top and the Koolance top with reservoir on the next round.
    
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post #4 of 5
I'm curious if you'd be willing to test and see if the liquid within a DDC is able to cool it enough on its own. In other words, Loop it up with a functioning radiator and monitor its temperature with the pump insulated. Depending on how you go about it (if you design it as a sort of torture test), it might risk the death of one of those DDC's. I guess you could measure its temperature in open air and then compare it to whatever temperature it reaches while insulated.
    
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post #5 of 5
I have always wondered that, why don't they feed the temps from the pump into the water that is flowing through it.
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