Electric Water Pump

[DHGTR]

Is anyone running 'just' an electric water pump on their Ultima. Thinking of going that way with mine, would like to hear your opinions. . . . Dave

[G Man]

Not yet but would do so next car or winter mod.

Bosch have just come up with a electric water pump which is used on the Bentley and is guarenteed for 100,000 miles.

G Man

[GreenV8S]

Do they also guaranty they won't damage the engine? The only EWPs I've seen are nothing like as powerfull as the mechanical equivalents, a mechanical pump puts in several kilowatts whereas the electrical ones I've seen are measured in hundreds of Watts. Compromising the water flow seems like a very bad move if you want head durability.

[mkoch1]

I am running a meizer electric pump on my ls1 ultima. In 90+ weather temp stays around 165 F at highway speeds. Goes up to about 190 when not moving. Mine has no thermostat so I'll probably have to put some type of restrictor in for cold weather driving.

Mark

[builder]

The electric (Meizer) pumps are good. Dependability is still an issue. I have had the Meizer in an LT-1 and carried a spare on road trips and the track. On the road, the temps were fine. On the track, they were elevated. Since I plan on lots of track time (and frequently driving almost as if I were on the track), it's going to be mechanical pump for me.

[stig]

I had a Davis Craig for a while. It was crap! Took it out and installed it in my race car and it failed at the 1st meet

That said, I think that CSL etc. are pretty good.

[GreenV8S]

The biggest issue with any of these is the flow rate they will produce against a realistic back pressure. For example the flow rates on the Davis Craig fall through the floor as soon as you offer any back pressure. These pumps flow enough to maintain the average temperature, but not enough to give good protection against hot spots in the heads. IMO it's false economy to fit something like this on a powerfull engine. The cost of the damage if you don't have adequate cooling is huge, compared to the 3-4 BHP you stand to gain.

[adequatespeed]

I am using the CSI electric pump. No problems at all. I would definately fit one again.

I agree with stig the David Craig pump is crap.

[stig]

adequatespeed said:

I am using the CSI electric pump. No problems at all. I would definately fit one again. I agree with stig the David Craig pump is crap.

I suppose it doesn't help that whenever I see the Davis Craig pumps I think of Avid Merion's impression of Craig David!.

They're not "proper 'bo I tell thee"

(this will make no sense to our US readership but for anyone who like Bo Selecta, you know the score )

[gtrclive]

Try this one... Does 55 GPM in free flow, you need to run a Stat because this acts like a restrictor, so your building pressurize in the engine. This raises the boiling point, promotes less hot spots and cavitation and creates a better heat transfer to the water. The actual flow may drop to half that, but you don't need big flows, you need constant flow at all rpm's and no air in the system.

[gtrclive]

Was watching American Hotrod the other day to find they Used the same pump on the AlumaTub... Glad I bought it now......

[DHGTR]

thanks for the replies guys, certainly some things to think about.