well with Gavins idea I tried to solve my water pump problem with using the front asemebly off the 20V and the rear housing off the 4Ac. Now the 20V has one extra blade on the impellor however I found this to be irrelevant. Heres how they looked:
Fitting the two together I found they came within about 1mm flat from fitting. So I very carefully ground down the impellor blades on the 20V water pump. This was a bit tricky as one big slip and it would be the sealing ability of the housing. After taking a bit off I would paint it silver, and rub it against the rear housing which was black to see where the high spots are. Folowed shortly by more grinding. Soon enough the two fit together nicely and I purposefully kept it a close fit for efficiency reasons. The original blades are further into the housing so by grinding the 20V ones to suit I had a reduced surface area to push water. However I think this would be compensated by the fact that I has reduced the tollerances betwen the blades and the housing from about 2mm to next to nothing. Also add to that the extra blade and if that wasn't enough my Hyundai radiator would make short work of any extra heat if there was any. This may even have the benifit of less power losses in turning the pump. Anywya heres how the blades ended up looking:
Now that thats been done look at how the bottom outlet faces staright into the dise of the alternator:
So it's time to make a custom alternator mount and some piping.