Jimmy325i

Anyone ever think of electronically driving their water pump?

I was thinking that rather than having the whole cavitation problem above 4-5K (the exact rpm is debatable) it would make just as much sense to rig an electric motor off the side of the block where the PS and AC pumps normally go. Set it up for constant speed opperation at the most effective rpm and away you go.

Anyone know how big of a motor would be needed for such an application?

I'm also contemplating a single wire GM style alternator. Anyone have any experience running one on an FC?

rx_7_driver

my .02cents, GM alts. suck they don't last long with an engine that revs high, as far as the water pump i know they sell an eltric one for our cars



-Shawn (97 GMC truck, on its 5th alt)

Jimmy325i

I intend on having a quality 1 wire alternator built for me by a local rebuilder. (unless I just go with a cosmo unit)

How much are the electric pumps? I'm not familiar with them at all. (going to look into that now)

I can build my electric drive for less than 50 bucks in parts, and maybe a couple hours of fabricating brackets on the car.

Turblown

iTrader: (12)

Just buy an electric waterpump.

Jimmy325i

Find me one for 50 bucks....

I do my own fabrication.

silverrotor

iTrader: (1)

FWIW, scathcart has one. He maybe able to add to this.
You probably have the same Interest as I do...to remove the one last belt running of our motors deeming our engine belt-free.

Liquid Anarchy

iTrader: (2)

...makes it kind of hard to charge the electrical system w/o a belt...

Jimmy325i

Two belts... One running to the bottom left of the motor, (where my 1-wire alt will go) and one on the water pump running to the electric motor directly above where my alt will be.


I intend on keeping the water pump belt driven because that will make it easier to match the motor and the pump rpm to what I want it at. (pulley reduction etc.)

I'm kinda kicking myself for throwing away my former parts car's accesory mount. It would've been cake to simply mount stuff to that and use its adjusters. But, a piece of angle aluminum will be sufficent. (that bracket was pretty substantial for what it needs to do in my application)

I looked on google for an electric pump and am not finding any. I also checked mazdatrix and the 7 store. No luck....

Liquid Anarchy

iTrader: (2)

you mean the P/S A/C mount? I'll send mine to you for shipping.

scathcart

The full set-up for the mexiere set-up is over $400, and as afr as I can tell, has no place to put a thermostat.

It also deletes the mounts for the alternator.

The meziere set-up is not well-intended as a bolt-on kit.



Using a gear driven waterpump can be worthwhile on a race car. I have done so. My issue was remounting the alternator so I could get free belt access to the water pump. This set-up is ok.
I moved my alt to the former a/c area, and put my water pump drive motor in the former alt. position.
I am also running a custom mounted 200 amp alternator to handle charging. I did not set-it up as single wire; I wanted the dummy lights to continue to work, and to not have to activate the alternator manually.

I don't recommend setting up an electric water pump for any street car.

Jimmy325i

Colby, don't worry about it. I can make a bracket that will take less work from scratch than modding the stock one for my purposes. I already have the design in my head. I just have to decide to commit to going electric.

No one has done this before?

scathcart

Did you even READ the above post? I did EXACTLY what you are wanting to do.

Why bother asking a question if you won't listen to the answer?

NZConvertible

Electric water pumps are as old as the hills, and have been used on race cars for many years to stop cavitation from running at constant high rpm. There is also an ideal speed to pump water through an engine for maximum cooling capacity, and that's the other advantage of a constant speed electrically-driven pump. But unless you plan to run a constant high rpm for long periods (i.e. street car) they're totally unnecessary and simply add something else that can fail. Manufacturers size water pumps and pulleys to make the most of the constantly changing engine rpm, and even highly modified turbo street cars run fine with a healthy crank-driven pump. Also note how many race cars run happily without an electric pump.

BTW, if you're thinking about an off-the-shelf electric water pump (as opposed to driving the stock pump with an electric motor) have a look at this article.

Jimmy325i

Well sean, since you asked... You said nothing about the motor size you used, you said not to do it, and I did read your reply which made no sense, as I will point out for you.

"Using a gear driven waterpump can be worthwhile on a race car. I have done so. My issue was remounting the alternator so I could get free belt access to the water pump. This set-up is ok."

Ok, so you start out with a gear drive and its run on belts? Yeah.....

Perhaps this statment you made about me. "Maybe your reading skills are at about the same level of your english skills" Better suits you.

I'm also slightly surprized that you posted in my thread. Being as I "have plenty of time to spoon feed bullshit onto this forum" as you so nicely put it.

You also re-pointed out the need for relocating the alternator, which was stated by myslef long before your self proclaimed "word of god" answer came along. Do you read what I say?

NZConvertible

Do you want people's help or not? Sean's the only one here who has done it (your original question), and all you have is abuse. Asking "no one has done this before?" in the next post's after Sean's lengthy description of his set-up, and then getting stuck into him, just makes you look like an ***.

Jimmy325i

Ok, I'll be blatantly honest here. I would rather burn my car to the ground than listen to sean's opinion. He has continually bashed me in every way he can think of in every thread the two of us have been a part of, and I do not welcome his comments. I'm nearly certain he is/was waiting to bash me again here as well.

Also, My thread is for the viability and expressly how to implement a home-made type electronic waterpump drive. It would appear that his primary experience is in off the shelf devices. He gave them more verbage in his post than attempting to help me with my home brew idea.

sean, Take an afm and slam it on your knee with the flapper door in the inlet up position and tell me it doesn't move from inertia.... Now stay out of my threads!

scathcart

If you had done a search, you would have found out long ago that I had stated this. My "word of god" was available 6 months ago, long before you made this post:

https://www.rx7club.com/forum/showth...ric+water+pump


Yes, I "read what you say". Engrish, anyone?

Jimmy325i

Once again you have pointed out a thread having nothing to do with home brewing a water pump drive motor, just off the shelf overpriced units which replace the stock one.

Liquid Anarchy

iTrader: (2)

poor little jimmy, can't take the heat of someone constantly bashing him... remember our religion talk? This is KARMA!!!

scathcart

The link describes the drive I am currently using. I never mounted the Meziere set-up. It is an $80 electric drive motor wich uses cogged pullies to spin the stock pump. How much different is this from what you are wanting to do? A DC electric motor is a DC electric motor (in the most basic sense)... how much more of an explanantion do you need?

Tell me... when walking around with your eyes shut and hands over your ears, do you fall down a lot?

Evil Aviator

http://www.simplemotor.com/selfmotor.htm