I've seen engines like this before on the Internet.
Typically they were in a horizontal boxer configuration, and I don't remember them being Diesel.
No supercharger and or turbocharger?
That exhaust in the video looks a lot like a 1977 Porsche 911's thermal reactor.
The air intake path is wildly long.
https://achatespower.com/opposed-piston-engine-history/
Quote:
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With advancements in technology and innovative engineering methods, Achates Power has created a more fuel-efficient opposed-piston, two-stroke engine that meets today’s stringent emissions standards. By leveraging a broad suite of tools—such as computational fluid dynamics, laser Doppler anemometry, oil sulfur tracing and structural dynamics simulations, to name just a few—we have been able to revive the OPE architecture as a viable alternative for today’s transportation needs.
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Yep, I thought it was a 2-stroke.