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Author Topic:   Electric Water Pump and serpentine Belts
posted November 03, 2002 03:11 PM
Posted some of this in the Mod section too, so please bare with me.

I've come to the conclusion that I will be running an alternator for the first time next year.

Now since I will have some extra amperage to throw around. Has anyone ever used an electric water pump. I've always thought they are Drag Race stuff, but in the catalog I read that they are advertising them as off-road and oval racing parts. Are they talking spefically about the flow rates or are they durable enough to use in an oval track car?

Also, I would like to switch to a serpantine belt. I run Power Steering, and if I stay with an alternator is there a way to run all the accessories without a tensioner? I can't think of how to route the belts without having to run a smooth pulley on the water pump and driving it with the back of the belt.

With an electric water pump it would be a piece of cake.

posted November 04, 2002 01:15 PM
Well I did some research and the folks at Meziere that make a billet aluminum electric water pump, say that under the most extreme heat cycles and abuse that you can still expect at least 2500hours of service from their water pumps.

Figuring that in the average show a car runs about an hour and a half maybe two hours that means that the pump would be good for about 1250 shows. Not too bad, I typically replace them once every other year anyhow.

posted November 04, 2002 05:35 PM
Running the water pump off the smooth side of the belt is going to spin the water pump backwards, so you would need a reverse rotation water pump from a later model vehicle.

posted November 04, 2002 09:20 PM
remember if you brake a belt you loose the alternator, waterpump, and power steering and if you run an belt driven oil pump and you loose the belt, the motors done. if you run an electric waterpump you wont have to worry about the belt but i would stay with seperate belts so you dont loose everything.

posted November 04, 2002 09:41 PM
Has anyone come up with a way to mount the alternator off the bellhousing? Like where the fuel pump would be. Im some what interested in running electric waterpump, electric fan and alternator to free up 40 hp i would guess. And i think a bellhousing mounted alternator would be the way to go.

posted November 05, 2002 09:23 AM
you could also buy a rear end yoke with a pulley (can't remember who sells it) to mount it in the rear end if you don't mind a little more unsprung weight. Just be careful of the flying debris.

posted November 05, 2002 12:14 PM
I've thought about putting the alternator on the rearend but I have about 10 different gears between 2 cars, some spooled and some with black gold diffs. It would be way WAY cost prohibitive to run that style. I don't wanna spend a week swapping yokes out either.

I've also thought about running one off the bellhousing, and I know Bert or Brinn has a setup to do this. However, I run 180* crossover headers, so I don't have any room on the back of my engine.

I may have been talked out of the electric water pump. After talking with the folks at Stewart ( They said that though the flow rate is relatively high on the electrics I'm looking at that the pressure is lower. Meaning they flow 55gpm at say 5psi, when a mechanical will flow 55gpm at 20psi. Obviously a mechanical is RPM dependent, but that's a good thing too. Losing the big fan makes a huge difference though.

posted November 05, 2002 05:04 PM
I've seen the pinion mounted alternator kit before, but dont think the belt would stay on too well with all the mud that gets flung up onto the pinion. The bellhousing mounted idea theoretically should work, just a matter of having the reverse style fuel pump and fabricate you're own brackets, and put cog pully on alternator.

maniac motors
posted December 15, 2002 03:24 PM
hunt the salvage yards for 84-86 gmcars and truck(some 87 also) for the early serp setup. it used a standard rotation water pump and also had a small v pulley to drive a smog pump which can be used to underdrive the power steering pump.this setup is cheap and the most time spent will be moving the power steering pump forward to line up with the small pulley.

posted December 15, 2002 07:03 PM
Thay make an alt built in water pump probably less expense than you're talking racemate about 450.00 I think

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