On: How a Car Engine Works

[userbinator]

The one in your video appears to be a 2-stroke opposed-piston diesel, and that was tried several decades ago with not much success:

https://en.wikipedia.org/wiki/Commer_TS3

Here's an animation of one:

https://www.youtube.com/watch?v=pGaISFg_ZIw

There's videos of these running on YouTube, they have a very distinctive sound like other 2-stroke diesels.