Anyone tried electric water pumps? V8Supra had a bad experience with the Davies Craig unit in 2003 (documented here: http://lextreme.com/forums/showthread.php?t=138&highlight=Davies+Craig in post #3), but I've heard good things about the Mezieres.
When they're mated up with a thermostatic PWM controller, and run in conjunction with a thermostatic electric fan controller, in theory, you can keep the engine running at the ideal temperature and reduce the thermal shock (high deltaT's which routinely occur). That's in theory...... in practice however, there's now a few more new components to break. (some interesting reading about these twin PWM controllers here: http://www.dccontrol.com/intp6.htm)
I'll soon be building up a BMW motor which has had a poor reputation for overheating and blowing head gaskets. Apparently BMW's water pump is marginal for the application, as there have been several revisions over the years, but even the later motors had overheating problems. I'm considering using twin electric pumps to try to gain better performance than the single OEM mechanical driven pump provides.
Meziere claim a 55 GPM (free) flow rate with their larger pumps, so by my simplified heat transfer calculations (500*GPM*DeltaT), this puppy can transfer around 160 horsepower worth of heat continuously with only a 15 degrees temperature rise across the motor. That's not bad, so two of these ought to be able to keep the big BMW motor cool, if I can manage to fit enough radiator in the car. I don't know how much this flow will drop with added head.
By contrast, the Davies Craig unit only circulates around 32 GPM (again free flow), so it's not even in the same league as the Meziere. DC claim they successfully cooled Le Mans Ferrari racecars with two of these pumps on each motor: http://daviescraig.com.au/main/display.asp?pid=44 but I have my doubts, and would believe V8Supra's claims before DC's
Comments & other ideas welcome!
John
When they're mated up with a thermostatic PWM controller, and run in conjunction with a thermostatic electric fan controller, in theory, you can keep the engine running at the ideal temperature and reduce the thermal shock (high deltaT's which routinely occur). That's in theory...... in practice however, there's now a few more new components to break. (some interesting reading about these twin PWM controllers here: http://www.dccontrol.com/intp6.htm)
I'll soon be building up a BMW motor which has had a poor reputation for overheating and blowing head gaskets. Apparently BMW's water pump is marginal for the application, as there have been several revisions over the years, but even the later motors had overheating problems. I'm considering using twin electric pumps to try to gain better performance than the single OEM mechanical driven pump provides.
Meziere claim a 55 GPM (free) flow rate with their larger pumps, so by my simplified heat transfer calculations (500*GPM*DeltaT), this puppy can transfer around 160 horsepower worth of heat continuously with only a 15 degrees temperature rise across the motor. That's not bad, so two of these ought to be able to keep the big BMW motor cool, if I can manage to fit enough radiator in the car. I don't know how much this flow will drop with added head.
By contrast, the Davies Craig unit only circulates around 32 GPM (again free flow), so it's not even in the same league as the Meziere. DC claim they successfully cooled Le Mans Ferrari racecars with two of these pumps on each motor: http://daviescraig.com.au/main/display.asp?pid=44 but I have my doubts, and would believe V8Supra's claims before DC's
Comments & other ideas welcome!
John
