Someone on the OC forums asked about using an Eheim 1250. Here's my reply:
Quote:
If you compare the headloss chart for the block, and the PQ curve of the 1250, you'll find that you can expect a flow rate of 7 lpm. That of course assumes that there are no other restrictions...
If you add the curve for a typical heatercore, from BillA's radiator roundup, you'll have a more accurate answer. As a rough estimate, you'd be lucky to get 4 lpm (1.0 gph), which would give you a C/W of 0.19 (assuming that the block is mounted properly).
So if your heatsource is 70 Watts, you can expect a CPU temp of about 13 degrees C above your coolant.
(I think that's right...)
If you were able to double the flow rate, your CPU temp would only drop by about one degree C.
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More comments added: doubling the flow rate also means quadrupling the head. The Iwaki MD-20RZT won't quite get you there. (by Since87, now there's a familiar name
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