Pierburg Cooland Pumps CWA 50 $75 - DIY Electric Car Forums
How about a cheapo all-in-one unit? Pierburg CWA 50 specs:
Quote:
Voltage: 8.5 to 16 volts
Current at 12.5v : 6.5 amps
Free flow capacity: 30 liters per minute.
Capacity with 20ft head, 8.7 psi, 0.6 bar: 24 liters per minute
1/2 inch barbed ports.
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How much flow rate do you need? 24L/min is a bit more than 1 gallon every 10 seconds.
PS: in reply to the pump being ridiculously easy to spin by hand: It's a centrifugal pump, so the load decreases with flow rate and you're only spinning it a few RPMS, not enough to actually let the pump be effective. Open the thermostat and spin it with a drill and you'll feel a lot more counter torque in your wrist.
Sam