Thread: 2 pumps ?
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Old December 12, 2007, 11:21 PM
Squeetard Squeetard is offline
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Join Date: Nov 2007
Location: Hell
Posts: 4,013

Don't do it.

First off, flow rate is not everything. Circulating the coolant faster does not always equal better cooling. The coolant needs to spend time in the radiator in order for it to cool off.

I run my race car without a thermostat (Valve that opens at a certain temperature, every car has one). If I don't put in a restrictor plate in place of it, the car will overheat constantly for the exact same reason. The plate is no small thing either, it takes a 2" diameter flow down to a hole the size of a nickel.

Second, all you are doing with the first pump is forcing water under pressure at the second. the impellers of the second pump are not designed for this.

You don't think you have enough flow, get a better pump, see if it helps. Keep one as a spare.
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