Join Date: Mar 2002
Location: Austin, TX, USA
Re: mechanical or electric water pump?
Unless you cut out the alternator during your 1/4 mile run, an electric water pump is not going to save HP. Energy can not be created or destroyed, so however much power it takes to move the water through your cooling system, the alternator will have to make that much, plus more (which will get turned into heat).
IMHO, electric water pumps are a waste of money that can be spent on other stuff that WILL make more HP. But there are some benefits. For one, they provide a constant flow unlike an engine driven pump that changes pumping speed with RPM. And you can free up the HP during a 1/4 mile run if you disengage the alternator and run off the battery. But practically speaking, the HP you'd save wouldn't amount to much, and if you're racing for fun, think about what a 1/10th of a second is worth to you.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI