Well, its interesting that you should mention that. I decided to experiment and try something similar.
I took my BIX and mounted it underneath my yy cube and ran the barbs up through the bottom into the mobo side of the case. I figured that heat rises, and the air is cooler down there, and with wheels, the bix has clearance.
Well, I found out that if you care about your temps, dont bother. You NEED to blow air on that rad or your water gets hot under load rather quickly.
I'm leaving my rad where it is, but I am going to try and design some sort of high CFM blower to pass air over it underneath the chassis. I'm thinking of mounting something like a turbine or two together in a little box-like unit and the intake for them comes from underneath and they can blow together just under the rad.
My temps under load range from about 45 to 48c with a fan blowing on my rad underneath, which is acceptable to me. Ambient temp is around 31c. These figures are reported via my mobo util, so the accuracy is probably off. I know there is still a lot of air in the circuit though. I can see a 5 inch stretch of watterless space in the circuit when I shut down the system. I have just been too lazy to put some more water in. I'm not sure how much of a difference its going to make though.
-Ice-
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