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The Continental engine seems to have been a major disappointment if the XP67 test program is anything to go by (McDonnell XP-67 - Wikipedia, the free encyclopedia). Probably the reversion to the separate cylinder construction was a faulty idea. Aside from this, advances in fuels and supercharger technology enabled competing engines having larger cylinders to achieve high specific power outputs. The hyper cylinder concept seems to have infected numerous US engine development programs - certainly the Wright R-2060 and Lycoming O-1230 were based on very similar ideas. There may have also been some influence on the Chrysler IV-2220, though this engine did have a cylinder capacity that was closer to that of contemporary engines.
The guy running that engine really doesn't know much about WWII V-12 engines.
If you treat an Allison or a Merlin like that it will rapidly fail on you or will wear out VERY prematurely. They like to change rpm gradually and not until they are warmed up and at operating temperature.