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crazy water pressures

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  • crazy water pressures

    at the dock the water pressure is 18-20 psi @ 4,000 rpm.
    When underway the pressure is 11-12 psi @ 4,000 rpm.
    Why is there a drop when moving through the water??
    Dom
    Does anyone have the answer to this. I have replaced the thermostats and gauge, and there was a new water pump at the beginning of the season. In previous years there was 18-20 PSI at WOT.
    Last edited by domyamaha; 06-28-2011, 07:00 PM. Reason: more info
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