This IS very interesting, I haven't visited this forum yet, I'm glad I did!
Two things:
1) I've done lots of waterpumps and I have definitely seen lots of impellers pressed on to the wrong depth. Too far, or not enough.
2) While this careful attention to impeller depth is good, is there a penalty in how much more HP the "new and improved" waterpump is consuming? Can there be too much pumping resistance? I think I've heard that some waterpumps can suck up 10-15 HP? Probably not a big deal to most, but the semi serious racer guys may care...
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Dave
http://www.squidsfabshop.com/?
(updated January, 2013, Pypes exhaust installation)
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