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Heater core causing restriction?

post #1 of 9
Thread Starter 
So I purchased a slew of parts from various retailers, among which was a heater core from Danger Den's closing. I have an EK DCP 4.0 which is supposedly rated at 800 LPH. I'm not sure what the head rating is. I'm currently running the heater core, pump and reservoir outside of the case with as little tubing restriction possible. The pump is sideways so that the water flow can go straight to the core.

The loop is set up Res -> Pump -> Heater core -> CPU block -> Res

The loop uses 1/2" tubing and the waterblock is a Swiftech Apogee XT, and I don't believe that is causing the restriction. Barbs only, no quick disconnects.

I don't have a flow meter available but it feels like a lot of water is being pumped into the heater core, but the tube feeding from the core to the block doesn't feel like it's coming out strong at all. The water being received from the block to the res seems like it's coming out as a small drip, but it is filling the res back up. Do I need to upgrade the pump, or should I move up to a new radiator? The only other radiator I have is a 120mm aluminum radiator I purchased last year by mistake, and I don't want to throw that into the loop. PT Nuke and silver killcoil are the only additives.
post #2 of 9
can you post a picture of this heater core?
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Backbreaker
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BRUTALIS
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post #3 of 9
Thread Starter 
It's this one:

post #4 of 9
Thread Starter 
Mine came without fittings, and if I recall the smaller pipe is the inlet and the larger pipe is the outlet.... trouble is, I forgot which was which, I had to saw off the ends to get the tubing to fit over the pipe. It's a bit snug but nothing too drastic. I'm going to try switching the inlet and outlet and see if that makes a difference.

So I switched the tubes around and it didn't make a noticeable difference. I switched the radiator temporarily with the aluminum one and as expected the temperatures are worse, but the flow seems to be even worse. I think the pump might be dying. Looks like I'm going with a Laing.
Edited by Flying Toilet - 2/2/13 at 10:21pm
post #5 of 9
Thread Starter 
Okay, I'm losing my mind over this. I think I've narrowed it down to the block. I've tried two different pumps and two different radiators and I can't seem to figure out why nothing comes back from the block. I have my loop looking pretty ridiculous now; the reservoir is mounted to the side of my DVD cage, and my heater core/pump are sitting on top of a USPS medium flat rate box to make sure that there isn't any restriction caused by any other components other than the block. The water just isn't coming back from it. It is supposed to be fed in the center barb on the block, correct? Or do I have that backwards?
post #6 of 9
When I switched from the Apogee XT to my EK Supremacy, flow jumped from 1.1 G/M to 1.8. That is with a rev 1. The rev 2 is better, but not that much better, according to the reviews I read.
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post #7 of 9
I tested the restriction on a bonnie heatercore a while back here:
http://www.xtremesystems.org/forums/showthread.php?155780-Bonnie-Heater-Core-Flow-Rate-Test-Results&highlight=bonnie

It was not at all restrictive internally, very low like most radiators. (about .15psi at 1gpm pressure drop)

The apogee XT however is a higher restriction block. Pressure drop is about 5.3psi at 1 gpm. The pump is also good but not as strong as a DDC or other 18+ watt pump. If you can bleed the air I wouldn't worry too much though the block is designed for working well at lower flow rates.

Pump is good for about 4.8 PSI at 1 GPM, since you are over you flow rate will be less than 1GPM. That is still ok, but it will seem slow visually and you should notice a pretty big drop in pressure across the cpu block squeezing the tubes.
Edited by Martinm210 - 2/3/13 at 3:48am
    
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post #8 of 9
Thread Starter 
I have a fan speed controller, if I lower the pump speed should I see a difference?
post #9 of 9
Thread Starter 
I'm about ready to give up on this thing. I might buy a new block. Temperatures are still 75 degrees @ 1.38 vcore at 4 Ghz on a 2600k. I'm going to try reseating the block one more time and let the pump run throughout today. I can't figure out why this isn't cooling any better than my Megahalems other than the block restriction.
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