I made the same point in Permalink #3.
I am a fan of the
en.wikipedia.org/wiki/Split_cycle_engine. I couldn't remember the name Scuderi but the general article shows there is more history. I still think a boxer four would be the best configuration. Gas/compressed air hybrid.
It appears though, that the up 'n comer is the
Achates opposed piston engine. Based on the
Junkers_Jumo_205 but with modern materials and fuel injection. The current shipping product is a standby diesel generator.
Quote:
Fairbanks Morse Engine in the 1990s merged with ALCO to make the FMALCO line. In October 2013, FME signed a joint development and licensing agreement with Achates Power to reduce emissions and fuel consumption of Fairbanks Morse proprietary and dual-fuel opposed-piston engines.[18] The opposed-piston diesel engine once made by Fairbanks-Morse is still (August 2019) manufactured as well as the new Trident OP for electric power generation.
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en.wikipedia.org/wiki/Fairbanks-Morse#Modern_descendants