X15 questions

[marek4792]

(09-16-2020 )tree98 Wrote:  I wonder what the reason would be(if in fact they actually do)for Cummins to want the oil temp higher on the X15 than on previous engines?

Well we know that higher oil temperatures eliminate condensation in the oil, one theory I've heard was that it increases the efficiency of the after treatment system. I've mentioned once the idea on here about any benefit of installing a 215 degree oil thermostat in an engine that runs in high temperature environments or in an enclosed space like under the hood of areo-trucks and in RV's, but in this case the engine being higher compression, quickily shot down by Rawze himself for the reasons above.

Something I've forgot to mention on that post (for the sake of argument) was lets say you had something happening in the engine causing stupid high oil temps. The oil temperatures regardless of what thermostat is installed should still show something is wrong. The 235 degree thermostat doesn't fully close until 260 apparently looking at quickserve which i find very odd. should fully close much sooner I think... By that theory a 215 degree thermostat should fully close at 240, or it may act like you removed the oil thermostat from the oil cooler, who knows? Then again there's no telling what oil temperatures the thermostat experiences oppose to what the oil temperature sensor sees. Just speculation by the way.

(09-16-2020 )Explosia Wrote:  My temp stays 185-190, but will easily rise if the engine is asked to work. In the desert (I live in Arizona) it’s always up around 200-210 and the fan is constantly kicking on to bring it down.

The truck I sold (2015 cm2350) didn’t act this way. Like rawze posted, the oil never went abive 225, and it would take a long hard grade to get the water up to 210. However it would run warm in the desert too, but not as bad as this engine.

does the temperature seem to hang when the fan is on? and when the truck does cool down like leveling out does the coolant temperature drop below operating temperature like close to 160 degrees or so?

{edited by Rawze to say "closed" where you mentioned "open"}