[Thimothy]

Heavy diesel engines were dominated by the rest of the world in the 50s. Military aviation has no need for efficiency nor actual maintenance cost targets and thus, you have way more manufacturers of military than comertial engines.

My point is more that these domains seem civilizationally Hard. Western companies are very far in the effort/results curve. Will the Chinese get there? I guess at some point, though I doubt there is any incentive for the ICE motors in particular.