In a message dated 9/30/2001 8:53:32 AM Eastern Daylight Time,
guy@weller-lakes.freeserve.co.uk writes:
> Someone mentioned "Cavatation" (sp?) which is the effect caused when
> the quantity of air bubbles generated by the impeller running at high
> speed begin to reduce its efficiency in pumping water. There is an
> optimum speed for the water pump to work at its best. Spin too fast
> and it pumps less water!
>
Another situation I have heard of, and think I have experienced, is the pump
sucking air into the weep hole. A mechanic told me, after we were failing
to find any other problem when I was overheating, that he had seen a couple
of water pumps that would not "weep' to tell you they were goners, but did
the reverse--they "sucked air' into the system and created the cavitation
effect we are discussing. I put in a new pump and the problem was solved.
--David C.
|