Did you know that Mazda once sold an RX-8 powered by hydrogen? In fact, the rotary engine used in the Mazda RX-8 Hydrogen RE could run on either gasoline or hydrogen.
source/image(PrtSc): Engineering Explained
When running on hydrogen, there were unique advantages like efficiency and emissions improvements, while gasoline could be used to improve horsepower or vehicle range.read more: Engineering Explained
This video dives in deep into the double-rotor engine and how the hydrogen combustion was implemented, including the unique advantages of a hydrogen powered Wankel engine.
The model is designed so that you can see the moving parts of the rotary. All three of them. The center iron plate and front rotor housing are on hinges so the block can be opened up like a book.via: Engineering Explained