Pump testing

[pHaestus]

Yea but not as much heat into the water as my Little Giant. That thing's even worse (but quieter cause it has no fan)

[Zhentar]

I put a thermal probe to the side of my little giant and it broke 90C, and thats with about 25C ambient.

I want an Iwaki now, the MD-15 has a very similar P Q curve but its rated at 31 watts instead of 47.

Then again this guy only cost my $55. I'd say its quiet but I can't compare it to any other pumps

[pHaestus]

My 3E-12NYS is "ok" tempwise as long as I run the radiator fans even when there's no heat source and the fans are pointing at the pump

[Zhentar]

I'm planning on watercooling my pump. Still trying to work out how exactly though.

[pHaestus]

Eheim 1250: 1.54 GPM

A graphical summary:



Would have expected it to be ~ same as the L30. I think Bill found the 1250 underperforms by a bit too...

[KnightElite]

Heh, my fault for not bringing the pump over to pH's house on Sunday, the PC broke and I spent all day fixing it and forgot about going to his house, lol .


Anyways, we are planning some more testing next week sometime, so stay tuned... .

[Les]

Looks about right.
From visual inspectiom of your Mfgrs P/Q curves(L20, Eheim1048,Eheim1250, L30,and MCP-600 )



Hate the units, but......

Edit: Added MCP-600).

[Les]

A comparison of results with some of the curves used in my previously posted simulations( eg http://forum.oc-forums.com/vb/showth...hreadid=184315

[pHaestus]

That's a very nice way to graph it all Les

Just put Swiftech MCP-600 into loop: 1.75 GPM was the result. It's so small and yet very effective. It isn't an especially quiet pump though.

[BrianW]

Ya, I just recently upgraded my pump from an eheim 1250 to a hydor l30. This pump is way louder then the eheim. If I could fit it in, I would put a 1250 back in. Any one care to construct a theoretical flow chart of two 1048's in series?

BrianW

[Les]

Added MCP-600 to first graph.Obviously one cannot simply use Mfgr's curves to estimate flow - Unless I've been silly.
Will investigate further after racing (Goodwood and Chester).
To confuse have revamped 2nd graph:


Edit: Added graph. Been dragged to the pub after 2nd race

[BillA]

Les
I suspect it will be found that the MCP600's P-Q curve is a lot closer to reality due to its having a closed impeller (as do the Iwaki high pressure versions)

The factory QC check is to run each pump for 3min., then verify 3 points on the P-Q curve.
And here we are running ~30% of the pumps for 3 to 24hrs under various load conditions to see ‘what we find’, so far only the noise reduction

pHaestus
we are finding that the noise is substantially less after 2 days or so of running (grease in the ball bearings)

and an additional note re the MCP600:
it does NOT tolerate 1/4" fittings on the inlet
- it will work for a while, but it is cavitating; and when sufficient air has built up in the pump housing it stops pumping
still running but not pumping

put those Innovatec reservoirs in a system with an aquarium pump

[pHaestus]

I don't THINK cavitation is an issue; the inlet side has a 4" piece of 1/2" Tygon connected to the res via a 5/8" hosebarb.

I'll go downstairs and turn it on now and let it run for a few days.

[BillA]

no no, I did not mean cavatitation was related in any way to audible noise
in fact it cannot be heard
1/2" is fine
do run the pump for a while, it will help some

[Joe]

Originally posted by unregistered
no no, I did not mean cavatitation was related in any way to audible noise
in fact it cannot be heard

Cavitation n. 1. The sudden formation and collapse of low-pressure bubbles in liquids by means of mechanical forces, such as those resulting from rotation of a marine propeller.

That does create audible noise when it happens. Or are you just talking about in the scale of a small pump?

[BillA]

lol
no submarine detection stuff goin' on here
strictly speaking it is audible, but not really on our scale

[Joe]

Never know when a Russian Akula sub is out there looking for you and your watercooled PC!!!

[Zhentar]

After all, just because your paranoid doesn't mean they aren't out to get you.

[Aardil]

ok I am ordering 2 MPC600's tommorow for my new rig, If I understand Billa correctly, the inlet plummed with 1/2" I.D. is ok?
or should I go to 5/8 ID for the inlet?
I had orginally planned on using 2 1250's (since I have 1 already) but using Cathars's Cascade blocks, he lead me to believe the 1250's would work but really needed more. The inlet hose is only about 3 inches long and is a straight shot from the res. I had originally planned on going with the 5/8 but reading the spec sheets I see the MCP600 has a 1/2 inlet. It can still be changed to 5/8 at this point if it would be better.
Also the pumps are standing on their tail end Inlet pointing up, Res is mounted above pumps if that makes any difference.
Thanks for your help
Aardil

[BillA]

in general, the larger the inlet the better the pumps performance
1/2" is fine
set 'em on their tail (less noise also), but get some foam padding
ours is on the base

[pHaestus]

Ok Bill I can vouch for your earlier statement. The pump is definitely quieter now but still has a hum. I also see that the low rate has increased to 1.81 GPM with nothing changed except the pump has been run for ~ 12 hours straight. Is that also typical?

[BillA]

not checked
when/if I get 2 or 3 free days I'll put one on the flow loop

[pHaestus]

I don't THINK it's an issue with my testing because I swapped out pumps a couple of times every time I would plumb in a new one to see if they gave same values and they were never off. I DIDN'T run any of the other pumps for 12 hours straight though (but none of them were brand new either)

[BillA]

was not questioning your accuracy
3% is plausible, bearing resistance is quite real
and hey, the pump looks even better
ok by me, lol

the others have sleeve bushings, different setup
- less noise, less longevity

[pHaestus]

I was questioning it myself (better me first). I'll just keep letting it run for another day or two.