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Old 10-06-2019, 01:11 PM   #1
freemind_fly
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Default Coolant temperature

Shouldn't the coolant temperature slowly drop (to ambient temperature) after engine shutdown? Am I missing something?
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Old 10-06-2019, 01:33 PM   #2
grafspee
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I dont know exactly where is temp sensor but Engine with all accesories weights about 800kg maby more. Passive cooling will take hours.
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Old 10-06-2019, 01:35 PM   #3
razo+r
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What does cooling have to do with weight?
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Old 10-06-2019, 01:42 PM   #4
grafspee
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Alot, cooling 1kg of steel will happen much faster then cooling 900kg of steel.
If collat temp sensor is somewhere in engine it will be affected.
I found some infor, temp probe is located in coolant tube near wheel well in wing so, it want be affected by engine mass keeping heat high.
So temp should drop preaty quick.

Last edited by grafspee; 10-06-2019 at 01:51 PM.
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Old 10-06-2019, 02:41 PM   #5
freemind_fly
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Quote:
Originally Posted by grafspee View Post
Passive cooling will take hours.
Makes sense! Then let's wait for some hours. Two hours doesn't seem to be enough.
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Old 10-06-2019, 03:11 PM   #6
grafspee
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Quote:
Originally Posted by freemind_fly View Post
Makes sense! Then let's wait for some hours. Two hours doesn't seem to be enough.
I found out, that temp probe is located in coolant tube close to wheel well in wing so Engine mass wont effect temp drop much.

Last edited by grafspee; 10-06-2019 at 07:18 PM.
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Old 10-06-2019, 07:30 PM   #7
grafspee
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My testing aimbient temp 8.5C
I used ground crew Power supply to avoid errors from low battery voltage.



After about 1hour of waiting Oilt temp droped to ambient temp
Coolant temp droped to 92C
Question is, where are those temp probes instaled

Temps after restarting engine, let engien idle for 15 seconds , then i turned off ant took screem again.

I would gues that Temp probe is located near engine's head which is the hottest part of the engine. that would explain why coolant temp didnt fall a lot during 1 hour test

Last edited by grafspee; 10-06-2019 at 07:39 PM.
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Old 10-08-2019, 10:15 AM   #8
freemind_fly
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I say bug. Even after hours, it does not go back to the ambient temperature.
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Old 10-08-2019, 10:19 AM   #9
grafspee
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Quote:
Originally Posted by freemind_fly View Post
I say bug. Even after hours, it does not go back to the ambient temperature.
Hard to say, big castings can cool for moths.
Still it is 900kg of metal + its preaty good sealed from outside air.
For me it looks ok.

Last edited by grafspee; 10-08-2019 at 10:25 AM.
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Old 10-08-2019, 10:21 AM   #10
NeilWillis
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Quote:
Originally Posted by razo+r View Post
What does cooling have to do with weight?
Actually, it is more a question of mass rather than mass times gravity.

But physics states that heat is retained by large solid, massive objects for quite a considerable time, and I am positive ED were not coding all this stuff so we could sit in the cockpit for hours to watch it firtstly, increase and then slowly decay.

Or am I missing a point here?
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