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Originally Posted by Polygon
I understand that, it was a simple example of physics. You guys are talking about solid steel while a turbo is not. It is hollow and I am sure much more brittle than steel. It is the same for engine blocks and cylinder heads. Sudden contact with cold water can cause them to crack.
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What about a lemans car that runs in the rain? The first big uddle it hits will sent water flying all over the block, transmission case and everything else, but they don't crack. You're right about thermal shock, but steel is very resilient, tempering a metal is the same process, cooling it very quickly in order to align the molecules more closely together.
You would have to drop the temperature very quickly to damage a steel engine block or turbo, water can absorb alot of heat, but it wouldn't absorb enough to cause enough shock to crack it. A turbine blade red hot doused in water wouldn't even crack, they do very similar things with cutlery made of less quality metal when they temper them, you would have ot cool it with some kind of liquified gas, oxygen or something like it.