I don't want to bust your bubble, but you are barking up the wrong tree. You
are saying that your overheating problem is a product of poor design yet
thousands of these have been made and sold and in successful service. They
don't have your problems. I suggest you find the real problem and fix it.
Everything can be improved.......including the Triumph cooling system, but
redesigning a cooling system instead of fixing what's wrong is not
reasonable.
Steve

wrote in message
...
My Triumph consistenly runs warm and I would like it to flow a bit
more water. The vanes on the impeller are minisule compared to other
water pumps with similiar displacement engines. In the image the
2.0 / 2.5L engine displacement Triumph water pump with impeller is on
the left and the proposed donor impeller (from an Isuzu 2.3L) is on
the right.
http://i290.photobucket.com/albums/l...g/P1010003.jpg

How much press is needed for a cast iron or cast steel impeller? My
machinery handbook gives a bit of a overview but no good suggestions.
I am thingking about 0.001 to 0.0013. Your thoughts?

In trying to dismantle the two pumps, there is inadequate room to get
a bearing seperator between the impeller and the pump housing on
either pump. My thought is to remove the pressed on fan mounting
flange and then press the shaft (with impeller attached) out of the
pump housing. I got the pressed on fan mounting flange off of the
Isuzu water pump but did not succeeded in pressing the shaft out of
the housing (watching the deflection of the press and the increasing
effort on the jack hande, I stopped adding force). I have a "30 Ton"
Harbor Freight A-frame press that I suspect is capable of about 20T.
Does my proposal in dismantling sound wrong? I can cut the Isuzu pump
body apart if needed.