electric water pump?

[quote]Careless wrote: [quote=BLOZ UP]Oh, I know what you meant. It just gave me a brilliant idea…

[quote]Careless wrote: [quote=BLOZ UP]That seems pretty pointless.

How is adding the weight of a 12v motor (not light) to turn the stock pump better than just driving the stock pump off the crank how? I've seen this done on a car at the strip, he didn't run any other pulleys on his engine, just 12v motor bolted to the inner fender, with a long belt to the water pump. Seems like a lot of work for little benefit, but then again who wants to spend $600 on an electric water pump.

http://bde-performance.com/pump.htm

Side note:
This company also offers a conversion kit for TH40, 4L80E(coming soon), and Powerglide automatic transmissions, so when serious drag guys get tired of killing stock Z transmissions.

http://bde-performance.com/th400.htm
http://bde-performance.com/powerglide.htm

It isn't about weight. it's about being able to purge the coolant to the radiator, with the rad fans on while in the pits to cool off your engine.

it's the same issue that people have with drag runs where they stop right at the end of the race and coast to the pits with a car that has serious water-movement issues as far as efficiency of the stock pumps.

a friend of mine keeps his revs above idle as he coasts to the pits so that he can have the pump move more water throughout the system until the thermostat closes.... he's learned his lesson from two other engines, and so far no issues using this method.

having a 12v motor and doing it that way would be easier.

That's what I thought, that it wasn't really about weight, but getting the pulley off the crank, and keeping the flow of the water constant.

Speaking of flow… does anyone know what RPM the stock water pump flows the best at/is most efficient? Does such a thing exist? I suppose it depends a lot on what fan you have as well…

A thermostat opens when it reaches a certain temperature not from water flow.

[quote]Rat1314 wrote: That's what I was getting at. Once the coolant got below the thermostat close temperature, the pump would have negligible effect.

yeah but if you had a low temp thermostat, like 150 degree one, that shouldn't be to bad on leaving it open

[quote]DeleriousZ wrote: [quote=Rat1314]I know what you mean now, I thought that was a odd comment to come from you but you have a good point. How cool would you want to get the motor anyway? if it's between races getting it too cool might be a bad thing?

you don't generally use a thermostat with an electric pump, you would use a temp sensor and have the water pump rpm change based on temp.

But you would still want some sort of gutten t-stat or restrictor. Water will not flow the same with it removed and wide open. At least on other engines i have seen this… can't remember how the water flows off the top of my head, but you have 2 paths on one side and 1 on the other of the housing.

What about using the lines for the heater core with an electronic valve on one side.

I found this while considering going to an electric circulatory pump …

http://www.conceptzperformance.com/Cart … r_Type=300

… which is listed for the Z32 300ZX. However, I believe it will work with our cars as well since the blocks (which is where the pumps are located) are virtually identical. I even checked Courtesy Nissan and looked at water pumps for both z31's and z32's --- they look to be the same part. And the mounting bolt patterns for both (mechanical and electric) are the same. As for controlling the pump speed (to maintain temperature as you now can run without a thermostat), the Davies Craig 820 module looks like a winner.

(http://www.daviescraig.com.au/Controlle … tails.aspx)

It can also control your electric fan, which will now be a necessity without the pulley driven water pump.

i got a vg30e and a vg30dett block along with a vg30e water pump....ill check it out tomorrow and post some pics.


and the water pump gaskets are the same according to autozone. but different part numbers for the pumps.

snout and pulley flanges seem to be different

that wouldn't matter for an electric pump. all that matters is they bolt up.

this is true