No really good fan suggestions unless you can source "Made in Japan" Panaflo L1A's, as opposed to the noisier "Made in China" ones.
Fans rated by the manufacturer as being below 30dBA all seem to be a case of "suck it and see". Have yet to witness any reliable fan specification information for said fans from anyone but the big guys (Papst, Panaflo, Delta, etc).
Am wondering if the low-profile tank size has anything to do with it? Venturi effect, or something else, preventing even distribution of flow into the tube inlets for the second pass? Effect is "masked" in the larger radiators due to increased cooling on the first pass?
The effects being observed do seem to imply that the water flow is not being distributed evenly as the flow rate is increased. Looking at real heater-core tanks vs the tanks which are fitted to the BI rads, and one can see a marked difference in the height of the tanks. Larger high-flow heater-cores and radiators do have quite involved end tank designs. Has something been overlooked at the design end in the quest for a low-profile solution by the "made for computers" core makers?
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