egt at shutdown

[pdt1081]

Mine depends a lot on what I just did with the truck. As was stated earlier, the heat soak can be a problem. That's why you can go over 1250F for a brief moment and not worry about burning something up. Stay above that temp for a sustained period and you have problems because the heat soaks into everything.

With that said, usually if I'm idling through a parking lot, by the time I park it's about 250F or 300F (pre turbo). I've had times where it has actually been down to 200F. If I was just on the highway with sustained 600F, I'll let it idle for a couple minutes. Usually while I'm carrying stuff into the house (I travel between school and home a lot).

 

[budtoh3zo]

I cool to 300*

 

[budtoh3zo]

wet sacking happens at 270*

 

[whatabudro]

My verbage may have been wrong when I used "wet stacking" but any extended idling contaminates the oil. It's from the way the piston rings are designed causing excessive blowby at idle.

 

[jopes]

so if letting our psd's idle too long they wet stack. how come semis are running for 8 plus hours while they are sleeping in them. Do they end up with the same problems?


If I am towing I usually let it idle for 10 minutes to cool off. if I just drive to / from work, park and turn it off. I never looked at the temps but I would guess under 400 for me. Going to check this week.

 

[Tbar]

300 degrees here............


Tbar

 

[Crumm]

so if letting our psd's idle too long they wet stack. how come semis are running for 8 plus hours while they are sleeping in them. Do they end up with the same problems?

They do end up with the same problems if they "idle" at low rpm. The proper way to "idle" for extended periods is to run the rpm's up a little. In our trucks 1300 or so seems to do the trick. In a semi when the driver is sleeping about 900 rpm will do the trick if the weather is warm. During real cold weather the rpm has to be increased to keep the engine temperature up. Up here in the winter when the temp hits -40 the semis idle at about 1500 or more. Idling for two minutes to cool down the turbo will not cause any damage. If it did you would have to shut down the engine everytime you stopped at a red light too..

 

[Snowman269]

300 - 350, never above 400 if I can help it.

 

[DragonSlayer]

hey, crumm, what remote start are you runnin with the turbo timer?

 

[JSPulliam21]

I can idle for 30 minutes and the EGT will never drop below 300*, and it takes 10 minutes to get there. I usually wait until they drop below 400* and shut it down.