<< Jeff Spitzer wrote:
 >
 > This looks like a classic case of inlet cavitation. >>

Thanks, Jeff.  That's not what I wanted to hear, but would rather hear
it now than later.  I was under the impression that I had about 14 psi
(absolute) inlet pressure during the test, and would have (at s/l) 15
psi plus the radiator system pressure on the inlet side, thereby,
reducing the probability of cavitation.  Hadn't considered the temp
effect.

Any suggestions for an easy mod to improve the inlet side?

Thanks, again.

Bob Darrah

Jeff Spitzer wrote:

Not without seeing the pump.  The most common cause is a localized
acceleration of the flow.  This can be caused by a too tight bend or some
sort of area reduction.  Another possibility is that the problem is in the
impeller itself because the inlet angles are wrong on the blades.  This is
usually not a major concern since most (not some) water pumps in production
cars operate with significant seperation and recirculation within the blade
passages.  Bad things happen when this leads to choking though.

Jeff Spitzer

 
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