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Old 10-08-2010, 02:19 PM   #11
faster than you think
Join Date: Mar 2003
Location: Denver, CO

What pump are you running here? And do you just use the factory pump as a manifold to route the water into the motor?

Originally Posted by RS1 View Post
Electric pump with temperature control, remove thermostat. The stock pump uses too much power at high rpm since the flow is overkill. The pump is made for a minimum flow at idle. If the pump cavitates, gas bubbles will lower the water to metal surface.

Also plug the hole on top of the water pump (which is fed by an outlet on the front of the head). Water will bypass the radiator. It's there for the pump to circulate water when the thermostat is closed.

I have cut of the front of a stock pump and taken out the shaft and impeller. I welded the hole closed and are using the inlet on the pump body to feed the engine coolant from the electrical pump.
1967 Volvo 122S
1992 Volvo 745 driver
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