E46Fanatics - View Single Post - [Cooling System Upgrade] 1-BAR Radiator Cap
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Old 10-07-2012, 10:13 AM   #110
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Join Date: Apr 2011
Location: South Carolina
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My Ride: 330i 5 speed
Originally Posted by SeanC View Post
That is not too difficult to guesstimate. If expansion lowers the volume by a factor of 2 (for example, assume .5 mL initial empty space, for 8.4 liters of fill level, the expansion will be about .25mL), at constant maximum operating temperature of 96 degrees Celcius, this relation will apply: P1/V1 = P2/V2. Pressure will be doubled to 2.72 bars... Hah, that justifies the use of a 2-bar cap lol!

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But to those of us who dont just top it off, a 1 bar cap would be fine

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