Compression Ignition Addict
Join Date: May 2011
Location: East Tennessee
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Making sense of the temp delta... Trying to think it through.
Since getting my gauges installed, I've noticed about an 8-10* delta between my oil & water temp. I have done the complete swap and ELC swap but unfortunately didn't have the extra gauges beforehand, so I have no idea if it changed at all...
That being said, I began to think about why the delta matters. If I understand the logic correctly, if the oil temp is more than 15* warmer than the coolant temp, it means that the coolant passages in the oil cooler are somewhat clogged and restricting coolant flow. In my case, my ECT is around 180-184* and my oil temps never exceed 190-195*. NOW - In thinking further - Aside from the coolant hitting a bottleneck, the cooler is still working well enough as the oil temps are still well within acceptable levels. Isn't that the main concern?
I'm trying to think of the harm of a large delta (15*-25*)... Even if my EOT reached 20*, my ECT would most likely still be say 180* and my EOT would be 200*. Both of those numbers independently still sound pretty good.
Realizing of course that a high delta means that the cooler isn't as efficient as it SHOULD BE, but in the case of oil potentially only being 200-205*, where is the harm? I don't have the EGR system anymore and assuming my temps are both in fine shape, I don't think I'm at risk of engine damage, right? I mean, if its the coolant side of the oil cooler that gets clogged, but the ECT is still consistently low, what harm is there? This would also suggest that the oil side of the oil cooler is flowing just fine, so it's not like a blockage is there to prevent the oil from flowing at a high enough rate to keep the bearings safe.
It's really late here so I hope I've articulated the point I'm trying to make well enough. Basically, even if your ECT/EOT delta is high; what is the overall harm being done if both temps are still within spec and the emissions systems have been deleted?