I may be completely off here, but if you dont have a thermostat that could be your problem. The thermostat regulates how much coolant (or in your case water) is going through the system, If you dont have a thermo, the water may be moving to fast through the system to be sufficently cooled by the radiator.
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JohnWhizz1800:BBBOOOOOOOSSSSSSTTTT! F Mugen
John Whizz1800:Mugen =136 ft lbs
AIM: Shinmantis