Chase Bays Fluid Relocation Tanks

[Altaran]

The radiator has a pressure relief cap so the system won't run over 2 bar. Increasing the pressure increases the boiling point of a fluid. Atmospheric pressure, water boils at 212F. At 2 bar, the boiling point is raised to 249F. The goal is to prevent the water from boiling.

Bernoulli's principle applies to a pump in that it must have a pressure differential to flow to mechanically increase the velocity of the fluid. While you are correct about bernoulli's principle, coolant is an non-compressible fluid. It does not apply the same way as it does to aerodynamics.

A centrifugal pump must have head pressure or it won't pump which is why the coolant returns to the t-stat on top of the water pump's suction chamber. If the pressure was reduced below ambient the pump would cavitate and damage the impeller - which is what causes the impellers to disintegrate. You'd have to look at the pump curve but I think it is reasonable to assume that the OE pump had pump above 2 bar. Fitting a higher pressure cap will allow for a higher max system pressure and an higher boiling point.

If you wanted to increase the reliability of the coolant system you'd better regulate the head pressure into the water pump to eliminate cavitation.

The principle does apply to coolant pumps. I used to work for a big OEM supplier of pumps, also for cooling systems, so I have seen plenty of performance graphs and test results.
Also your assumption about pressure is incorrect. Water pumps are usually designed to operate between 1.1 and 1.4 bars.

Edit: flow loss with increasing pressure may not be as bad with the old mechanical pumps vs newer electric ones that we made, it will just be more parasitic power loss on the belt drive.

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