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Originally Posted by mwolfman
Since your block isn’t "normal", have you tested it to see what happens if you use a liquid with a lower viscosity, like alcohol?
The same goes for pumping power, since your block is restrictive, what gains do you get for mounting two pumps in series?
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Alcohol (ethanol) has a higher viscosity than water for temperatures above about 10C.
Acetone is one such liquid which is significantly less viscous than water, while apparantly having fairly decent thermal conductivity (as liquids go). Haven't been able to track down large quantities of acetone though, but then again I can't say that I've tried that hard. I'm sure the local trade-supply paint shop would be able to get some for me in 10litres quantities with little trouble.
The blocks are of middling/moderate restriction only, and I mean that in terms of comparing to some of the various super-restrictive euro-blocks, and in comparison to the more open-flow US designs.
I don't design blocks specifically for high pumping powers though, and I certainly did not do so with the G7. This is all carefully balanced through base-plate thickness choice. I actually chose a base-plate thickness for the G7 that best suits use with something like a single Laing D5 (~2.5W of hydraulic power acting on the block directly in a loop consisting of the block, pump and a radiator). Once you get to Laing D5 levels the gains beyond that are in the order of a 0.7C improvement per 100W by the time you get to 6W of applied hydraulic power.
It's much like any block, the more flow you push the better it performs. The issue eventually becomes one of managing the pump heat dump though.