Originally Posted by egret
"Horex" VR Engine Video
This is 25 years old. Volkswagen developed their VR engines in the late eighties.
BTW the ultimate expression of this technology is the Bugatti Veyron W-16 engine.
The "revolutionary" Horex engine merely adds wedged piston domes so you can have a flat cylinder head. This is a big non-no for emissions because of the large "crevice volume" above the top piston ring where lots of unburned hydrocarbons like to hide. For this reason alone no manufacturer will touch it.