Max Water PSI

[DH Zunic]

hey guys;<br /><br />I have a '91 Johnson 200GT and was wondering what should be the max water pressure when trimming up? I was playing around this weekend running at 62mph, and noticed the PSI at 15, that seems low to me. would that be right? and how high can I go?

 

[Reel Appeal]

Re: Max Water PSI

Seems low to me too.Normally,the higher the rpm's the higher the water pressure should be.Although,if you are running@62mph with the motor trimmed up too high you may lose water to the pickup on the lower unit.That may be the problem if pressure is higher at lower speeds.Or,the impeller on the water pump may be slipping.Watch the guage thru idle to fast.

 

[OBJ]

Re: Max Water PSI

Not sure 'bout actual numbers Dz but I would think max psi is going to depend on how strong the impeller is.....like is it new or been in a couple years? Is the housing and cup in good shape? No deep grooves in the impeller plate or cup? I think I would be more interested in some reference readings to go by. Then if it starts dropping off, may be time for a pump overhaul.

 

[codkiller]

Re: Max Water PSI

DzBimmer I Just installed a water pressure gauge on my 1990 200hp Evinrude and get about 8psi at idle 20psi at 3500 and 30 psi at WOT.

 

[Dhadley]

Re: Max Water PSI

The actual reading on your gauge will depend on a couple of things;<br /><br />Where the gauge line is hooked into the system --<br />Which water pump kit you have --<br />Your X dimension (too high for standard water pick ups?)<br />And if your gauge is OK<br /><br />Did it ever read more?