The idea behind watercooled CHRA's is that it will thermosyphon after shutdown and keep taking heat out of the turbo.
In the old days this was a HUGE concern as the heat build up would cook the Oil and turn it to coke (Carbon) deposits on the shaft which is almost as hard as diamond and would...
Sorry missed the Q as we'd gone to a new page !
My "assumption" on the Race motors was Oil pressure/volume was more important to them than Oil temp so they used the Heavy NA blocks and fully grooved main bearings.
Not sure on the KS's but I'd also assume no being a race engine used under...
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