marc wiese wrote:

With the stock pulley the waterpump is known to cavitate
(churn the coolant instead of pushing it) at high rpm.

I know that water pumps from previous generations had cavitation problems
at high RPM. This problem could be visually confirmed by observing erosion
(pitting) of the pump impeller due to the cavitation. It was mainly a
problem with cars which spend a lot of time near red line (i.e. track
conditions). In Jack Yamaguchi's 3rd gen book he states that Mazda
engineers went to great lengths to redesign the pump to eliminate
cavitation at high rpm. Has anyone observed impeller erosion on a third
gen water pump or found some other evidence that would indicate cavitation?


Mike Putnam
San Diego RX-7 Club

 
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