Run'n on the hose questions

[Nikon Man]

Don,
Please clear up these 4 questions that I've heard so many variations to about running on the hose using the proper adapter on the lower unit of course.

This is in reference to a 3.0L 250 EFI & 3.0L SportMaster with a Merc hose adapter on the nose.

** What's the max RPM on the hose ?????
** Can you run higher RPM's if theres more water pressure ??????
** Is there such a thing as to much water pressure/volume ????
** Does it hurt to leave the water on when the motor isn't running ?????

Thanks

[EuropeanAM]

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nikon Man &raquo;</TD></TR><TR><TD CLASS="quote">
This is in reference to a 3.0L 250 EFI & 3.0L SportMaster with a Merc hose adapter on the nose.

** What's the max RPM on the hose ?????
</TD></TR></TABLE>

Recommended that you not exceed 1200 RPM when utilizing this type of attachment: PRIMARILY DUE TO A NO-LOAD CONDITION ON THE ENGINE!

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nikon Man &raquo;</TD></TR><TR><TD CLASS="quote">** Can you run higher RPM's if theres more water pressure ??????</TD></TR></TABLE>

Not recommended (see reason above).

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nikon Man &raquo;</TD></TR><TR><TD CLASS="quote">** Is there such a thing as to much water pressure/volume ????</TD></TR></TABLE>

Pressure: YES. Although there's not a "technical specification", I would not recommend anything in excess of 75 psi pressure (when dead-head tested at the hose bib). I primarily use 45-65 psi on our water system.

Volume: No. You'll not be able to (at the above pressures) flow more water throught the water intakes than the engine can handle (under any reasonable scenario).

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Nikon Man &raquo;</TD></TR><TR><TD CLASS="quote">** Does it hurt to leave the water on when the motor isn't running ?????
</TD></TR></TABLE>

No, it does not harm the engine (but is certainly not a "green" practice).

[Nikon Man]

Thank you, and as always, the straight story short, sweet and to the point..........