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Keep in mind the total incompressibility of liquid, in an air free system 1 additional drop of water can send the pressure skyrocketing. The only expansion room available is probably your hoses then the cap. Tim A
Hi Tim, I think something like you mention is occurring. In fact, thinking further about it, it may be that the initial heat of the combustion chamber causes the water in the side housings next to the combustion chamber to elevate in temperature almost immediately and expand in a constrained space with no air. Thus as you suggested, giving rise to the rapid pressure increase. Then after a few minutes of running the metal of the block (and other parts) will have heated (and expanded) increasing the coolant volumetric area resulting in more volume and therefore less pressure.
Ed A
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