Posted by MarkB_MI on October 05, 2023 at 03:13:52 from (174.211.37.178):
In Reply to: Opposed-Piston Engines posted by Geo-TH,In on October 05, 2023 at 02:28:00:
Probably the leading example of an opposed-piston engine is the Fairbanks-Morse 38-1/8. It has been in continuous production since 1938. Among other applications, it was used in diesel-electric submarines and, I believe, is still used as backup power for nuclear subs. Its form factor is pretty much ideal for subs, where a long, tall, narrow engine takes advantage of the available space. Also the considerable weight of these engines isn't a major problem in marine or stationary applications.
The reality is that engineers are squeezing about as much efficiency as is possible out of an internal combustion engine. At this point, efficiency gains are incremental. If opposed-piston and other designs that radically depart from proven four-stroke piston valve-in-head designs offered significant gains, the major OEMs would be looking at them. So far that hasn't happened.
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