I need to figure out how to machine these things. The clearance between
impeller and housing is critical. I think we need to research this a bit.
Next time anybody has their pump apart please stuff some modeling clay
in there and reassemble the pump. Twirl the shaft a couple of times
and take it apart. Then tell me how much space is between the rotor
and the housing. I suspect if you pump has excessive clearance it can
be made to work better by taking a cut off the housing and moving
the impeller closer to the internal part of the housing.

BTW the new pump should be able to run at a higher RPM and consequently
pump more water without cavitating. I suspect that sharp 90 degree
turn on the intake side is a factor in cavitation. It will be interesting
to see what Mazda did on the RX8 engine water pump.

Paul Lamar

Paul, my pump is apart right now.  I'll take a look at it tonight and see what I can come up
with.  Wow maybe I'll be able to contribute...:-)

Tom Webber

All help is appreciated. 

Paul Lamar
 
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