Quote Originally Posted by mudski View Post
Ėm going to go back to this. High EGT will result in higher water temps.... I was driving my Patrol yesterday and I noticed myself subconsciously looking at the EGT's rising as I was going up a steep hill and then watching the water temps also rise. The both drop as I came off the top of the hill.
I then remembered back, driving up the coast with the camper and knowing exactly when the water temps would start to climb just going by the EGT's. For mine, it was when the EGT's passed 260c the water temps would go up, and go up by 5degs by every 30 EGT's or there abouts...
This has a lot to do with cooling system condition.
In older systems it makes total sense to see water raise with egts. The engine is working harder, and hotter so the water would be heating up..
But if your cooling system is in good nick you may notice nothing.
I've seen 650 on the egts yet water temp didn't budge off the normal 89-91 range. .