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Okay time for another wrinkle..... WHY are you guys/gals waiting for seconds or minutes for a cool down???? WHY do you not wait until your engine temp hits X degrees???
Just curious how you can tell temperature cool down with time.
I typically shut mine off when my oil temp hits 187.... just a random number I selected for no reason at all.... Seriously.
Actually it is a number that I can remember. Guess it has something to do with penal code numbers I have heard.
Just curious how you can tell temperature cool down with time.
I typically shut mine off when my oil temp hits 187.... just a random number I selected for no reason at all.... Seriously.
Actually it is a number that I can remember. Guess it has something to do with penal code numbers I have heard.
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I admit I had no clue it existed. It would definitely circulate coolant while the engine is temporarily cut off at a stop light, which makes sense to keep the climate control happy. Does it circulate coolant through the turbo after final shut down? I’ve never heard it run.
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Haha, he said “penal”, haha.
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She said ride it hard and put it away wet. No cooldown 
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I don’t normally have a display where I can see actual coolant temp. Just … 4 bars, which never changes once it gets warm.
If you mean the oil temp - that number is wild, inferred based on calculations not an actual sensor, and I don’t put a lot of stock in it as a meaningful value - other than if I see it do something unusual.
You are right... I meant (engine) oil temp... and Like you say... it is wildly inferred. But it is the only option I have to measure temperature at this time. (see what I did there?)
I don't know, just seems like something better than measuring temperature wildly by time....
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The willingness to learn is more valuable than already “knowing” everything.I never thought this thread would get contentious. I just thought I’d catch some shade for not understanding my engine.
I’m stupid and naive
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I know exasctly what you're talking about, I think. It's almost like the injectors get a lot quieter, right? My thought was that it was the port injectors shutting off after the engine is up to temp and switching to only direct-injection.
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I'll take a swing at this.
They are viewing the turbo/bearings as a very precise point load where there can be an immense heat build up in a very small area.
Because of the small area, it can be very easy to carry that heat away by dousing it with water (coolant), so letting the engine idle for even 30 seconds goes a long way to cooling a very hot turbo, but probably doesn't even register in the coolant temps.
Kudos to modern design with very robust cooling systems that can absorb/ release A LOT of heat.
If one were to just let oil sit on those point sized heat loads, in the good old days, that oil would boil/bake and leave a carbon residue (coke) on those bearings, essentially leading to their demise in short order.
BTW, the oil boiling/baking would occur at temps much higher than the coolant boiling, so keep that in mind as well.
As noted several times, this issue has all been mostly engineered out of existence, but logic still tells us, if you're working any motor extremely hard, it is bad to just shut it down immediately after that hard use.
Let it idle, cool down and thermally stabilize itself for a few minutes.
It will thank you in the long term.
This^^
For the last century and a quarter pilots have been saving their aircraft engines, both water and air cooled, with warm up / cool down regimens based on targeted oil temps.
Yeah, modern automotive engines are pretty tolerant of abuse by the consumer, but still…
I don’t like to put my Bronco into drive or reverse after startup until the engine idle RPMs have settled down, typically in a minute or two, especially in the cold winter months.
On the flipside, I give it a minute or so at idle before shutting the engine off.
I call it cheap insurance.
I disable AS/S for the same longevity reasons: startup is hard on an engine compared to just idling it. Oil drain down from the heads, etc. Plus, it’s gotta be tough on starter longevity, with all the extra restarts plus having to start the engine working against the torque converter in Drive.
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