Regarding shock cooling....We run a turbocharged engine and have never even come near the shock cooling environment. In the cruise one can slam the throttle closed and point the nose down and temps cool off pretty slowly...certainly slow enough to avoid shock cooling. The EDM monitors shock cooling and we've never come close...
I can't remember off the top of my head but in the cruise with cowl flaps closed we run at the low 300's for CHT. Even in a long climb at 90 kts CHTs don't exceed 400F - more like 380F (limit is 475F), and cooler on a 100 Kt climb (at 36"MP, 2575 RPM)......in UK weather of course......
So I believe it when Pelican's Perch says, that it is a myth
