[fernly]

There's a point in the posted video where they demo the V12 and you see drops of condensation forming at the ends of the exhaust pipes. Some kind of combustion is going on. Maybe it's running on propane instead of gasoline, but it's internally combusting. In the video of the guy with the model Ferrari, he mentions it is fuel-injected, and when he revs it, it sure sounds like it is an IC engine.

[mzr]

Condensation happens with air compressors, too. I had a small oilless compressor that when heavily used would put so much water in the air line a mist would spray out the exhaust port of the air tool I was using.

[wklauss]

He is using compressed air to run them.

[BendertheRobot]

My point was about the 72YO Spaniard. One big clue was the lack of means to cool and rid waste heat. Here's another video of his V12: https://www.youtube.com/watch?v=3YfTtGCsiD8 Search on Patelo for more.

Re. the Ferrari, that one definitely has signs of being a Otto cycle engine.... Exhaust gases, loud, etc.