![]() ![]() Certainly, many millions of dollars’ worth ofspoiler kits and CHT systems have been sold to pilots on thisbasis over the years. Pilots can perhaps be forgiven for harboring a strong gutfeeling that yanking the throttle back is a good way to bring oncylinder cracking. Still, it’s hard to argue with common sense, and common sensesays that if you thermal-cycle a piece of cast aluminum(especially while beating on it!) you just might induce it tocrack. I know of no pilot whocan say "I went up and did this and this and this to theengine, and then when I landed I found these cracks that weren’tthere before." Iknow of no fleet studies on this subject. To my wayof thinking, there is no scientific proof that shock coolingplays a significant role in cylinder damage in aviation."Scientific proof" is perhaps a poor choice of words.What I’m simply trying to say is, the hard evidence is scanty. I don’t think anybody has provably correct answers toquestions involving shock cooling of aircraft engines. Photo: Fred Weick made many contributions to our knowledgeof engine cooling.
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