Originally Posted By: dareo
The hill was climbed anywhere in the 2s 3s 4s sometimes 5k+ rpm depending on the sharpness of the turns. I wasn't on throttle the whole time since i had to slow a bit for the turn, then power out of it. Temp outside was a cool 55f or so.
I think the oil temp is related to engine load so if i'm going 80 in 5th vs 80 in 3rd i doubt it will add much more heat to the oil. When i do my 40 mile highway runs it never gets above the 210-220 range even with A/C and as fast as traffic allows driving.
Nope, oil temperature is more related to RPM than load. Here's big end temp on a test engine (fitted out with thermocouples) with three bulk oil temperatures (80C, 125C, and 150C)...you can see that the temperature rise has more to do with RPM than load...the top group there is no continuation of the full load line, as the bearing failed.
Doing 65MPH in my Caprice, if I stop and drop a thermocouple down the dipstick hole, I get 105C...same trip in "2" at 4,000RPM, and 129-135C has been seen in quite mild ambient temperatures.
Not this is the oil that's coming off the crank and down the valley, not the bulk oil temperature that has already lost a lot of heat to the the ambient (sump temperatures with a heat gun are around 15-20C lower)