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cavitation
one of the reasons cooling systems are operated at 1bar or 15psi of pressure is to reduce / eliminate
cavitation
which is a very real concern
cavitation can lead to hot spots and subsequent engine damage
but
more likely
you will run into erosion of the metal at the site (s) that cavitation takes place , you will not know there is a problem until the erosion gets extreme and perforates something
and
that is always bad / expensive / catastrophic
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