My test bench has come along way over the years. I now find it satisfying enough to post results.
The parts of the bench include 2 of these Cole Parmer 5 channel units
http://www.coleparmer.com/catalog/pr...sp?sku=0850216. One used for dT water minus die temp and the other as room temp and secondary die temp.
One Crystal Fonts CF633
http://www.crystalfontz.com/products/633/index.html which was used as a reader for the SwissFlow 800.
One Mak-4 Gen-X Pump. 1190gph @ 4ft.
One custom 1/2" x 1/2" die sim with heater running at 72 watt output.
Ford F-150 Heatercore with 1 Panaflow 120mm fan.
1 Swissflow 800 flow meter. I really like the Swissflow 800 flow meter. It has instant response time and goes down to .5 LPM. The only drawback is it has a pretty large pressure drop and it is recommended to have a 20 micron filter before it which adds another restriction. However I decided to live with this as I like the ease of use of it mated with the CF633 digital display. It connects right to one of the fan headers for easy installation. Also even after the restriction I was able to achieve 4LPM or better with all blocks tested here. I think most PC water cooling loops don't go much above that point anyway and if they do it is overkill.
I got a second Swissflow 800 from the good guys at
www.swissflow.com and will be doing a system build here with it when I get the cash to buy the rest of the parts. That will end up being the computer that runs my CNC mill.
Here are the results I got from my recent testing.