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If it was me, I'd do a little testing - start at cruise at
altitude - and shut off the pump and see what happens and how fast.
I'll just have to wait and see how it works
for you, because there's no way I'm doing it. I think you're closer to
underestimating the damage, than I am to overestimating it, and if I have to be
wrong, I'd much rather be on the safe side.
I think the temps will rise slowly enough to give you
plenty of time to turn on the backup in case of failure of the
primary.
I'm sure the temp
"gauge" will rise slowly, because there's no water flow, and the
sensor isn't near the combustion chamber. I'm also sure that the
combustion area of the block will be overheating like crazy. Why
would you intentionally subject your engine to that?
Rusty
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