Like I said, I'm willing to completely insulate and wall off the cooler to see if the mostly still air is cold enough to suck some heat out of the cooler try and get a larger delta than 13f. I can also insulate both the primary and bypass filters, either after or before I insulate the cooler, whichever you prefer. I don't think I'll be able to insulate the bypass tube unfortunately. Will there be any issues using standard fiberglass house insulation as an insulator? I'm concerned about fibers getting loose and clogging up the oil cooler, intercooler, or radiator.Well, I'd hoped for a smoking gun. Could you try insulating the oil filter? Obviously, with the oil cooler blocked 100% and only a 13* increase in temperature means heat is most likely being lost in other places as well.
We are in agreement that something besides the cooler is bleeding heat at this point, eh?
DJ, the thought had crossed my mind in the past of using an electric heating element. But that's drawing energy from the vehicle and any MPG gains to be had by the warmer oil would be lost. I'd rather find a way to keep the heat the engine makes in the engine.It might be time to start heating the cooler.
Oh, c'mon! That's kinda funny, right?
Very good experiment and data, @CM. I'm thinking that you are right about the 80%/100% wall. It would seem to be hitting some saturation limit.
It makes sense that there would be little or no difference at that point. The larger the heat differential, the quicker the heat transfers. Explains why the drop was so big the first 20%, but the second drop was only half as significant.