This reminds me a bit of the old Detroit...

Apr 30, 2019,13:32 PM
 

...diesel engines. 2-stroke compression ignition and you guessed it, supercharged AND turbocharged. 

powerful four cylinder. 
Lovely sound too: https://m.youtube.com/watch?v=QImzbeEInvs
There were also some aircraft engines like this.

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Achates Opposed Piston engine (a bit like a resonance watch?)

 
 By: cazalea : April 15th, 2019-09:37
Today I read about a company based here in San Diego (and Detroit) which is developing 1-3 cylinder engines to work in hybrid vehicles and military or commercial applications (like Auxiliary Power Units, compressors, generators, etc). Earlier in the 20th ...  

Very interesting.

 
 By: VMM : April 15th, 2019-12:22
I really would like to see present and future applications for that kind of engine. Thanks for sharing. Vte

But the oil would fill the chamber

 
 By: cazalea : April 16th, 2019-22:17
They’d have to re-engineer a horizontal configuration. Cheers Cazalea

This reminds me a bit of the old Detroit...

 
 By: xtype : April 30th, 2019-13:32
...diesel engines. 2-stroke compression ignition and you guessed it, supercharged AND turbocharged. powerful four cylinder. Lovely sound too: https://m. There were also some aircraft engines like this.

The crankshafts are linked together by gears at one end of the engine

 
 By: cazalea : May 2nd, 2019-14:51
The added economy comes from efficiency of combustion. Remember a typical internal combustion engine is only about 25% energy efficient. Achates can achieve 40% due to much higher compression (like a diesel), less energy lost to valve train, etc. better m...