Quote:
Originally Posted by Joe K
Other solutions involve trimming down your water pump vanes (to reduce the quantity) or putting a "flow restrictor" (sold by the parts vendors) in the upper tube, or incorporating a thermostat (sold by the parts vendors.) Any of these will not make a sensible change to your motor temperature as the wide open flow is probably too high anyway. (and the biggest resistance to heat travel is at the copper tube/air juncture at the radiator exterior.)
Joe K
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As I read the OP, I smiled to myself anticipating that someone would come up with something like this. It is an old wive's tale to say that the pump can cause overflow issues. There is a thread on the other forum at the moment where a guy (Greynomad) explains why. Trimming vanes, restricting water flow (so long as it's not too much) is voodoo. The ONLY water available to the pump to pump is what has already gone through the radiator. It is obvious that water cannot be created from nothing so whatever amount of water available to the pump is what it pumps and there is therefore the same amount of space in the radiator for the pump's output. Barring an increase in volume due to steam (boiling) or exhaust gasses (blown head gasket or cracked head), the cooling system cannot oveerflow once it has reached it's happy level.