Finally finished my baseboard heater setup

[JamesAvery22]

Temps are good. Completely passive and CPU's max at 39c with a room temp of 22c. Course its just the ondie probe through the mobo. My VRMs and NB get hotter than my CPUs (1.6ghz LVs @ 3ghz). I was going to wait until a new setup (X2 or conroe) but I was bored =) Bought two WWs from cooltechnica for under $40. Weird thing is I put a fan on the radiator and it only dropped my temps 1-2c.

One prob though my 20RZ is TOOO LOUD. Driving me nuts. Think it might just be my pump. Bought it on the FS thread here. Its works but maybe teh bearings are going bad or something... Anyone have any ideas on how to quiet these things down?

[brucoman]

I placed my 30RZ in a closet 5' away, works wonders

[BillA]

yup, my 30RZ is unheard on the other side of the wall
was surprised at its low noise even next to it, but I am testing

nice passive rad JA

[JamesAvery22]

Guess my 20rz is bad =( Your impressions of the iwakis is the same Ive heard from everyone else. Thanks btw Bill.

---edit

I wonder how much my temps will rise if I go to a Mag3. Got one laying around as a backup.

[dogbait]

I've had two Iwaki's (one new, one second hand), and both are noisy, making a sort of vibrating sound.

Any restriction does it unfortunately, they like fat, 1/2" ID tubing which is a bummer since my tubing is all 3/8" ID. Make sure you minimise restrictions, particularly on the inlet.

[JamesAvery22]

Originally Posted by dogbait

I've had two Iwaki's (one new, one second hand), and both are noisy, making a sort of vibrating sound.

Any restriction does it unfortunately, they like fat, 1/2" ID tubing which is a bummer since my tubing is all 3/8" ID. Make sure you minimise restrictions, particularly on the inlet.

I think mine is because of the bearings. When I put my ear right next to it it sounds like bearing noise. When I took the head off the pump and turned it on the motor was pretty quiet and didnt vibrate much at all. But with some restriction maybe the bearings arent keeping the shaft aligned like they should. I dunno...

----edit

Im thinking of getting a cheap md20rt and switch the heads. Is there any chance the problem could be my head?

[BillA]

take the pump head off and run the motor

[JamesAvery22]

Sounds fine without the head

[BillA]

the pump was run dry

[JamesAvery22]

Originally Posted by BillA

the pump was run dry

Was affraid of that when I bought it... Stabbing.

Where can I buy a new head?

[dogbait]

Before you buy new bearings, try running the pump with two short pieces of hose going into a bucket of water. If the pump runs silent in that case Bill, could the bearings still be shot?

In any case, new bearings are available from Iwaki Walchem
http://www.iwakiwalchem.com/

[BillA]

bearings are in the motor
impeller spins on a shaft
had some 40RZs run dry and the impeller makes contact with the housing
one could play with the pump head, probably for naught

[JamesAvery22]

At a quick glance the front housing of the head looks ok. Do I need to replace that AND the impeller? Or just the impeller?

If I take the head off the motor sounds fine. Slight hum. Of course when I first got it, the motor alone was pretty noisy. Got some lithium grease and greased up the bearings and it quieted down right away.

Ive been looking for the Z series impeller and can'd find it. All the places that sell replacement impellers don't sell the high head ones. Can I purchase right from Iwaki?

[Ruiner]

OT, but your 'stabbing' link gives me a 404

[dogbait]

Thanks for correction, I was mixing my 'impeller' with my 'bearings'

I get my spare parts straight from Iwaki Walchem, just tell them you're a business.

btw. JamesAvery22, you're making sure to screw the housing back on evenly and tight right?

[JamesAvery22]

Originally Posted by Ruiner

OT, but your 'stabbing' link gives me a 404

Fixed. Forgot I had that

[ElMoIsEviL]

Is the flow rate quite low?

I mean there seems to be ALOT of tubing there and a huge distance to cover. Also the fact you've got TWO blocks...

Must have crippled the flowrate no?

[JamesAvery22]

Originally Posted by ElMoIsEviL

Is the flow rate quite low?

I mean there seems to be ALOT of tubing there and a huge distance to cover. Also the fact you've got TWO blocks...

Must have crippled the flowrate no?

I dont have any way to measure flowrate but Im getting good temps and when I was bleeding the bubbles were moving as fast as I've seen before (mag3, 2 x 1048s, mcp600) with one block setups. I was thinking the noise was due to the motor because I thought that if a pump was turned on dry it wouldn't pump at all and mine is still pumping quite well. And its 3 blocks not 2 =)

[billbartuska]

Originally Posted by JamesAvery22

One prob though my 20RZ is TOOO LOUD. Driving me nuts. Think it might just be my pump. Bought it on the FS thread here. Its works but maybe teh bearings are going bad or something... Anyone have any ideas on how to quiet these things down?

Sorry I didn't read this post sooner (I'm not into silent computing). I'll bet what you are hearing is cavitation.
Hook up the pump with a 2 foot loop of 1/2" tubing with just a 1/2" ball valve in the loop. Run the pump and slowly close the valve. If it's cavitation you'll head a sound like the pump is pumping alotta air or, in the worst case BB's. If it is cavitation the only cure is to remove restriction fron your loop....or a less powerful pump.

[ElMoIsEviL]

Originally Posted by JamesAvery22

I dont have any way to measure flowrate but Im getting good temps and when I was bleeding the bubbles were moving as fast as I've seen before (mag3, 2 x 1048s, mcp600) with one block setups. I was thinking the noise was due to the motor because I thought that if a pump was turned on dry it wouldn't pump at all and mine is still pumping quite well. And its 3 blocks not 2 =)

That's insane! 1048's are my fav pumps.. but they're not powerful enough... damn silent though.

[JamesAvery22]

Originally Posted by billbartuska

Sorry I didn't read this post sooner (I'm not into silent computing). I'll bet what you are hearing is cavitation.
Hook up the pump with a 2 foot loop of 1/2" tubing with just a 1/2" ball valve in the loop. Run the pump and slowly close the valve. If it's cavitation you'll head a sound like the pump is pumping alotta air or, in the worst case BB's. If it is cavitation the only cure is to remove restriction fron your loop....or a less powerful pump.

But I was under the impression if I had very little restriction I'd get more cavitation. As in cavitation was caused by high velocity/flow? I was under that impression because when the loop is just a T line and a loop of tubing it is VERY loud. Its pretty loud now but with no restriction it is even louder. The more restriction I put on the loop(pinch the tubing) the quiter it got.


And I still havent found a place to buy a replacement head. Does anyone know of any place at all? Please help

[Brians256]

Cavitation happens when the impeller is rotating but the blades are unable to cause the liquid to move forward. The blades will always cause a pressure differential, but the lowered pressure behind the blades is unable to be filled by flow coming into the pump. Since insufficient liquid is entering the pump, the pressure behind the blades can drop enough to actually cause phase change in the water: the water turns into vapor and you get bubbles or cavities. Then, the bubbles collapse back into normal liquid and the cycle continues. It sounds like bubbles because there are bubbles. This (I believe) only happens in fairly powerful pump and in restricted systems.

Three ways to solve: lower the restrictions, decrease pump velocity, pressurize the pump intake.

[JamesAvery22]

How can I pressurize the pump intake?

---edit


Will changing that little 2" of tubing between the pump inlet and Res from 1/2" ID to 3/4" ID (the barbs on the MD20RZ are 3/4" right?) and changing the outlet barb on the Res from a 1/2" to 3/4" fitting (1/2" NPT connection) have any effect?

[dogbait]

I recall Cathar discussing a similar issue with his MD-30RZ.

My memory's hazy, but he mentioned feeding an Eheim into the intake which quietened the pump down. He also mentioned that the pump was noisier with less restriction, it is designed to pull through restrictive systems so this is understandable.

Best bet, ask Cathar

[BillA]

no, intended to pump not suck
NPSH
look at the position of the impeller at high suction vs. low