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Ok, so I bought the boat last August Took out 2 times last year for short runs and using this summer for learing the ropes before I go out in Puget Sound for the 400 mile trip back and forth to Desolation Sound. today on the short outing I idled to up to 1,500 RPM for about 40 minutes. Temp on both engines was below 180 - I would wager maybe 170. After 40 minutes jumped on plane to 3,200 RPM ran for about 10 minutes. Notice temperature on Port engine jumped above 180 to near 200 while starboard was right above 185. Came back off plane back to 1,000 RPM. Port engine pressure dropped to about 20 PSI while starboard remained at 40 PSI. When I got to slip about 15 minutes later temp on both dropped back to around the 180 mark. weird thing is port pressure stayed at 20 psi on idle while the starboard dropped off 40 down to around 20 on;y after that last idle period.
Checked both Oil levels before I started and after finished with them both in normal range. no weird milkiness in port oil.
Risers were cool to touch back at dock
Port engine coolant had spit a bit (less tha a cup or so) of coolant into expansion tank.
No leaking fluid under Port engine
Both oil filters were VERY HOT confirming the temp gauges both registering just below 180 at the slip.
I tend to more or less trust the crappy factory gauges and understand they can be off some but the past few times I have been out they would register around 40 psi and never saw temp get over the 185 mark on plane or on idle. The fuel gauge on starboard quit working begining this year (sheet) and this time out the speedo quick working but for just a while (assuming it is a pitot type and marina milfoil plugged temporarily.
Engines are the MX 6.2L Horizons.
I am going to bring infared temp gun next time out to eval various locations on the block.
In my go fast (Pachanga 270), my old twin 350 magnums were spot on at 165 degrees never deviated a bit for like 17 years. Wasn't until I repowered with Mercury Marine 357 4V alphas (and Sea Ray added through hull water pickups for the blocks) that temperature on those routinely is at 180 regardless of idle or 4,500 RPM but with the weirdness being as soon as you come off plane temp jumps to 200 but dropped as fast back to 180.
In cars, small block mouse temp is almost a universal 170 while the big block rat hovers around 185.
For those of us that don't know, what are typical pressure and temp ranges for these engines in our boats?
BTW- Obviously freshwater cooling and I do have Bravo 3 with outdrive showers too.