You have this exactly backwards.
Loop restriction is proportional to flow velocity.
Running rads in parallel effectively halves water velocity through that section.
Unlike many waterblocks rads don't strongly depend on water velocity to transfer heat from coolant to metal (there appears to be some radiator-idiosyncratic relationship, but nobody's reported a big effect, and it's unclear whether less velocity is good or bad).
So... halve radiator water resistance, add back in whatever additional resistance you get from whatever fitting(s) you use (possibly nothing if you run the two outputs from a two-output block each to a separate rad, the output from each rad to a two-input res, like the polyprop one from Swiftech.
|