[DeTomaso] Fw: water pump

[JDeRyke at aol.com]

In a message dated 12/23/08 2:24:09 AM, wdemelo at cogeco.ca writes:

> Where does one get this water pump backing plate? It has to be tig'd on?
> 
Off a lathe. Mine is a plain 4-1/2" OD (I think- its been a few decades since 
this happened) x 1/8" thick stainless steel disc with enough of a hole in the 
middle to clear the impeller hub, and three 3/8" holes that correspond to 
three of the impeller blades. I did 'rosebud' welds through the three holes onto 
the impellers to retain the disc. It was TIG'ed because I wanted to limit the 
heat input due to the seal which is less than 2" away, and because the 
impeller is also stainless. Regular weld on stainless burns away the nickel and other 
elements that make the steel 'stainless' so you get massive rust right at the 
weld. Braze is another option for stainless, but I chose to TIG it. No 
problems since I did this in 1990. As I said, all these little tweeks in theoretical 
efficiency did absolutely zero for lowering the operating engine temp, except 
for the addition of the big radiator. Cheers- J DeRyke


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