Loop/Rad/Pump Config. Issue

Johnmark · 10-05-2009, 01:18 PM

On the weekend I installed a new Feser 360 Rad horizontally on the top of an Obsidian case.
Just for kicks I cracked open the bleed valve on the rad while the loop was pumping. Instead of water spewing out all over I got a couple of burps of water and then air actually sucked into the loop.
The Pump is a new MCP350 with an XSPC top and is about 22" lower than the rad (so is the Res.), routed res>pump>HK3 CPU>swiftechNB>EK VGA>rad>res.
It would appear this pump can't generate enough head press. to fill the Rad. after going through all the loop components.
Does anyone see a problem in running the loop res>pump>rad>CPU>N.B.>GPU>res ?
I've tested this pump configuration against a MCP655 and with the modded top the performance seemed excellent. Developed 23 kPa discharge in an open loop so I was surprised to find it does not appear to develop sufficient head to fill the rad.
My temps are good, water running about 6c above ambient using 1850rpm G.T.'s running at 900 rpm, but I don't like the fact the rad doesn't completely fill.

alacheesu · 10-05-2009, 01:27 PM

To me it sounds more likely that you had a pocket of air in the radiator.

Johnmark · 10-05-2009, 01:32 PM

Quote:

Originally Posted by alacheesu

To me it sounds more likely that you had a pocket of air in the radiator.

That's what I thought until I removed the screw completely and let it sit for a few minutes ! No water coming out, no decrease in res. level, just lots of air being sucked into the loop.

kolombo · 10-05-2009, 04:15 PM

Did You tiltover the case aside for a while , presumably to evacuate air through outlet barb of the rad when pomp`s on. You should add some more liquid into the rig, guess.

heinz357 · 10-05-2009, 05:36 PM

Just had the same issue with my new build with rad in the top, and vertical rad in the front. Was a PITA to bleed, until I turned the whole pc upside down, and used a bridged, old psu to rapidly on/off the pump, until both the rads filled, and all the air travelled up the drain Tee!
Give it a shot, it may be your best bet!! Good Luck!

Johnmark · 10-05-2009, 09:38 PM

Quote:

Originally Posted by kolombo

Did You tiltover the case aside for a while , presumably to evacuate air through outlet barb of the rad when pomp`s on. You should add some more liquid into the rig, guess.

Yes I did tilt it side to side and got some air out. The res. has extra liquid in it.

Johnmark · 10-05-2009, 09:44 PM

Quote:

Originally Posted by heinz357

Just had the same issue with my new build with rad in the top, and vertical rad in the front. Was a PITA to bleed, until I turned the whole pc upside down, and used a bridged, old psu to rapidly on/off the pump, until both the rads filled, and all the air travelled up the drain Tee!
Give it a shot, it may be your best bet!! Good Luck!

Did your top rad have a bleed valve built in like the Feser's do?

I could try and turn over this 50+lb beast, however if nothing comes out the bleed valve which is on the top of the rad (even lying vertical) then I'm not sure if I'll have much luck turning it upside down.

I would think the pump should have enough jam to fill the rad when the bleed valve is removed? Or am I missing something?

Man this build with the new Obsidian case has been the biggest pain in the @##@$ EVER!

Waterlogged · 10-05-2009, 09:54 PM

Just an FYI, Steve (former owner of TC) had decided to get rid of the bleed valve before he sold the company, the reason?. . .it apparently didn't work well.

B-Shot · 10-05-2009, 10:17 PM

Remove 3-4oz from the res, then use that 3-4oz to fill at the bleed off outlet.
Or add a barb on the res fill port with piece of tube taller than the bleed off(do not cap) and fill the loop from the bleed off.

heinz357 · 10-06-2009, 07:10 AM

Quote:

Did your top rad have a bleed valve built in like the Feser's do?

No, no bleed valve on the rad, and no res either, just a Tee line.

Johnmark · 10-06-2009, 10:11 AM

Quote:

Originally Posted by Waterlogged

Just an FYI, Steve (former owner of TC) had decided to get rid of the bleed valve before he sold the company, the reason?. . .it apparently didn't work well.

Interesting.
When I think about it, the rad will probably never fill totally. Unless your pump discharges to the rad. The pump can take the unrestricted return flow from the rad faster than it can pump though all the blocks then onto the rad.

I'll be putting a vario 655 pump on once I get this pig of a build stable, which may help?
Problem with this build so far

Does anyone run pump>rad config.?

Thanks for your input peeps.