Concept power units from 2030

[DenBommer]

I think it's better not having any valves.

Freevalve??

Not familiar with that. But there's two stroke, or rotary. (Others?)

It is a technology from Koenigsegg: https://www.freevalve.com/

That was once the proposal to switch to two-stroke engines. Didn’t they also talk about an engine with opposed pistons? This seems heavy to me because you would then need two crankshafts.