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Old 03-15-2019, 10:31 PM
SlickGT1 SlickGT1 is offline
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Quote:
Originally Posted by andrewwynn View Post
So the point of 2bar is to keep the coolant liquid.

Although coolant certainly has a higher boiling point than water, for water these are the numbers:

At 2 bar, water boils at 120C (248F), just about the max operating temp of X5

At 1.4 bar, water boils at 109.44c (229F)

So the issue is: if the car gets to 110C, it will vent with 1.4 cap. That could be a good thing by giving you the obvious sign that it's running hot but 110 is barely over temp.

I still won't deny the logic of keeping all those mentioned 20 yr old parts at a substantially lower pressure, and the only time I've seen an x5 > 110c was when the ET split wide open and dumped the coolant.


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Truth. But we run bmw magic blue coolant as well. So that brings the boiling temp up. Even not at equal 50-50 mix, the temp will be decently over max operating temp. I know I’m not losing coolant, so I feel safe with it.
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