[DeTomaso] Waterpump

[cengles at cox.net]

Dear Jack, 

In my limited experience, I think you're right about the aluminum pump advantages over the stock pump. I am think that further pump improvement can be had be rebuilding a pump with the curved vane impeller and using much closer than EOM tolerances for the pump vanes to the pump housing. I just had a pump rebuilt in this fashion and the difference in tolerances is significant. I cannot document any improvement in coolant temps at this point with the new engine. In my opinion, a custom rebuilt water pump over normal aftermarket pumps has similar advantages to a custom rebuilt carb over an off the shelf Holley. Off the shelf is purdy good, but custom rebuilt is better. 

Anybody else with a rebuilt pump? 

Warmest regards, Chuck Engles


---- JDeRyke at aol.com wrote:
>IMHO, there's no advantage from one pump over another except theoretically,
>and in my experience, that has not led to lower engine temps. But the aluminum
>pumps are half the weight of a stock iron unit. I've used a Weiand 8209 for
>over 18 years, and the punishment it's soaked up is incredible; no leaks yet and
>it still cools the motor just fine. In L.A at least, there's a shop that will
>rebuild most pumps (seal & bearing), if you need such a service. Be very
>cautious with 'high-volume' or 'racing' water pumps. Besides the extra cost of
>these, a couple of our West Coast racer-types have recently lost impellers off
>the pump shafts, thoroughly messing up their track-days.... Good luck- J DeRyke
>
>