Electric Water Pump?

The water pumps on our trucks are not exactly known for being the most durable things, has anyone here done an electric water pump and E-Fan when their stock pump died? I'm thinking it might keep a little drag off the engine, maybe free up some HP, improve throttle response and bump the MPGs a bit.

My BMW had an electric water pump that lasted for 148,000 miles with no problems, it also would circulate water through the motor after it was turned off to let the engine cool off at the same rate. Overall, its really neat tech and I saw one for a SBC the other day and was wondering if anyone had done the same thing aftermarket with this truck.

 

Any idea of the rate between mechanical drag from a fan vs increase drag from the alternator? Curious if alternator drag is only increased by 1/3hp, where mechanical fan drag was decreased by 2hp (just speculating on the hp #'s). Is it a 1:1 ratio or can a savings still happen?

 

Rock is correct.

Added electrical load could even require a larger output alternator, don't know how much excess capacity our trucks have.

Couple of reasons it's done elsewhere.............

Compact nature, particularly in space challenged applications.

Looks, as in street rods, show cars. Helps clean up the front of the motor.

Efficiency. If I'm a drag racer, I can turn it off for the 12-ish seconds of my run if I made it switched. THEN I get a bit extra gain at no penalty. Just have to remember to turn it back on.

Don't see why it couldn't be done in our trucks. Might be practical for a specialized application. I'd still prefer a mechanical pump/fan for an off road application. I have much greater faith in the mechanical reliability in extreme conditions than the electrical.

 

True, but the water pump speed increases with the rpms in a mechanical pump, flowing too much and/or cavitating at high rpms, just so that it flows enough at idle. You can also do things like reduce the charging load from the alternator during wot runs. Overall, an electric water pump is better...the 1GR is just an old engine design.

 

Get a 1psi pump and switch to Evans coolant or similar. Done.

Many vehicles use electric fans from OEM. Had one on my Subi go out at 220k miles. Brushes will always wear out, if it uses brushes, but doesn't mean the electric fans can't last a long time. Just a nitpick argument.

Water pump hasn't shown signs of cavitation over 6k+ RPMs. Doesn't mean it won't being that the redline is 5500, and people have run 6200 regularly for extended pulls, without excessive temperature rise, just means that the cavitation limit might not have been reached.

If lab testing on the cavitation rpm has been done, by Toyota or other, it hasn't been shared.

Ending statement: forge your own way. If you want something done on these engines, you might just have to do it yourself. As I sure have.