Normal oil pressure 8.2L MAG

determined

Hello, what's the normal operating oil pressure for 8.2L MAG.   I have a 2012 Rinker 360 with these motors.
Warmed up at idle, the PSI is 61 psi (port), 54 psi (starboard).   Is this normal?
Thank you.

Michael T

When you say "warmed-up" I'm not sure exactly what you mean but I suspect it is something like what I used to do - I would wait about 10 minutes at idle before reading the engine oil psi thus giving both engines enough time to absolutely reach idle operating temperatures.

I may be able to find a shot of a screen grab of my vesselview here on the forum from my 2014 EC 360's 502 Mags. If not when I return home in two weeks I will have the info.

From memory there was not much difference between the psi of the two engines - maybe a slight operating fluctuation of one or two psi - definitely not 7 psi. Is a difference of 7 psi worrisome? I don't think so as Mercury themselves state there can be a 5% difference on the operating specifications engine to engine. 

Liberty44140

Is all of this on faria analog gauges? Or would a 2012 boat have digital smartcraft? 

F1100

There is no issue with that variance. Its two separate engines, 2 different pumps, 2 different sending units, 2 different gauges. That is more than enough oil pressure either way.

Michael T

Also there can be variance with the oil pressure  sensor. A while back I posted trouble we had with the water pressure sending sensors on one of my 2014 Mag 502s. The original sensor became erratic and it took three more to get a reliable reading.

determined

Sorry If I'm repeating myself, I wanted to thank everyone for their insightful answers.
It will be interesting to see if the fresh oil makes a difference.  I won't know until spring as I'm wintering the boat at the moment.   Season is always to short.  Some asked if I had analog or smartcraft.  This is a smartcraft system.   Honestly, I think I preferred the analogue gauges, easier to see everything in one glance without going through screen after screen after screen.   Wishing you a terrific winter!

aero3113

Those numbers seem good to me, what are they at cruise?

Ian

But 7psi is between 11 and 13%, more than the 5%. However wouldn't you be more concerned with it being within tolerance for the engine, not in comparison to another?

determined

Good Morning, thank you for the feedback.   When I say warmed up, I ran the boat up on plane - 3300 or so RPM, that's when I noticed the starboard engine oil pressure start to drop, come back up slightly drop.  It fluctuated between about 55 and 66 which I thought was odd.  The port stayed steady in the high 60s.  One manual I found on line says the operating PSI for these is between 30 and 70.   So, back to port, engine temp steady at 169F, but port reading  61, starboard 54 at 650 rpm, in neutral.   Don't know if its normal and always been this way, and perhaps I'm just noticing it now.    The other odd this, is the port OBD is on, dimly lit, I can't figure that out either.

Thank you gentlemen for your advice.

bry1429

The 502's M.T is speaking of stay really close in oil pressure. 

Michael T

Thanks Bryan. That's the way I remember it. I think my 350 mags were real close too!