1978 Evinrude 85 HP Water Pressure

jmerritt

Cadet
Joined
Jan 18, 2012
Messages
7
Installed a 0 - 30 water pressure gauge and T'd off right at the P hose elbow connection. Water pressure reads 12 - 14 psi at initial start up but as soon as full throttle is applied pressure will drop and stay at 4 - 6 psi. A new impeller was just installed and I am just wanting to verify if this OK or is this too low.

John
 

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: 1978 Evinrude 85 HP Water Pressure

The higher the rpm the higher the water pressure. Somethings not right.
 

oldman570

Lieutenant Commander
Joined
Mar 25, 2011
Messages
1,615
Re: 1978 Evinrude 85 HP Water Pressure

Could be that the T stat is opening up or if the motor has popit vales that open when the motor gets warmed up and at higher RPM's. All motors will run high on PSI untill the stats open then will drop some as the water will flow more freely around the cylenders and out thru the prop hub.
Oldman570
 
Top