water pressure fluctuates on 89 Merc 150hp black max...is it Normal?

Randy99

Cadet
Joined
Sep 17, 2018
Messages
9
So when running on the lake at 3200 rpm the pressure reads 6-7 PSI and then when I reach 4000 and beyond rpm I see about 13-14 psi. Is the lower rpm normal for the given water pressure or should it be higher? Poppet valve perhaps? Thanks much!
 

Dukedog

Captain
Joined
Oct 6, 2009
Messages
3,496
should be 3 ta 7 lbs at idle and increase as rpm is increased up ta 14 or better normally,, do you get any over heat alarm?.. if not I wouldn't worry 'bout it...
 
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