Electric Water Pumps?
 

Any one considered electric water pumps?
http://www.torquecars.com/tuning/ele...ater-pumps.php
http://www.daviescraig.com.au/Electr...s-content.aspx

Reads positively, reality maybe different.

There is a kit available from auto factory using the Daviescraig parts.

Does sound interesting, I dunno how much HP you regain by not using the mechanical pump.

http://www.autofactory.jp/product/to...=s&pm=t&seq=15

And how much heat buildup and loss of coolant circulation would result thereafter?

Bob @ Drift-Office, LLC

I don't trust ANY aftermarket electric water pumps for dependability. The main reason why cars come with them from the factory is for fuel economy. BMW is using them now on their 4 cylinder turbo engine.

Also, there's no proof that a higher flowing water pump is the best return on investment to improve cooling compared to radiator, oil cooler, etc.

If the pump was doing its job why would either of these issues occur?

I'm guessing you didn't read the links. It has nothing to do with increasing flow.
"the EWP may provide up to 10kw of extra power and additional fuel savings."

Not sure, only asked because I had a JZGTE motor come in last week with a stock one, had poor circulation and heat built up so we shut it down, changed out to a manual pump and all was honky-dory there after...


Bob @ Drift-Office, LLC

Oh I read it.

the electrical system was never designed for it, so now you've got more electrical load on the battery and alternator. The water pump has to be installed and calibrated correctly if you want it to save fuel without overheating your engine. I'd have to see how their rudimentary control system works.

Normally when controlling electric water pumps or throttled mechanical pumps you control to a temperature and/or pressure delta across the engine for maximum benefit. Otherwise you would be left with something like a simple speed and load table which is not going to have the same level of benefit.

It's not just "install this, get 10 horsepower" and you better hope your belt system is going to be reliable after re-routing everything. There's about a gazillion things that can go wrong with such a limited benefit.

I'd question the actual benefit of this. In any kind of sustained high load driving a mechanical pump will be more efficient so it wouldn't really be useful for racing.

For a daily driver, even if the controller was as good as arghx7 would like it to be, I doubt the cost of initial purchase and the increased maintenance intervals would ever be offset by the better mileage.

It might be useful for drag racing. :iono:

BMW has been using electric water pumps since 2006+ on the 328i, the 2007+ 335i. They are pretty badass. Though like anything with use, they do wear out and stop working properly. Replacement is pricey!

The one linked here looks cheesy actually. I will post a photo of the BMW one tomorrow.

Their main advantage is for racing. Where time is money. They're far more expensive than a simple mechanical pump and less reliable.

No offense, but the JZ motors never came with an electric water pump from the factory...

I'm with you though on not liking them as it's risky. Now an in-line secondary pump isn't a bad thing...

My bad - you're absolutely right! *Mild mechanical dyslexia* I was thinking hydro clutch fan - but the one in question last week had an electric water pump which was not cutting it.

Cheers!


Bob @ Drift-Office, LLC

Yeah, like most things electric, the OEM's are better than the aftermarket (e-fans also come to mind)

The hydrofan is great, but it's expensive to maintain here as the parts are rare and when you do find them, they're used...