Prohibited engines / Why these engines are banned from series production

What do you know about the heart of your car, its engine? What is it like, what could it be ?
Let’s start with some technologies that are not groundbreaking, but are just modifications of fuel-burning engines. Here is an orbital internal combustion engine which is called the Skyactiv-X by Mazda where the combustion methodology of a diesel engine involves synchronization of a gasoline one. And here is a rotary engine whose development was financed by the Department of Defense of the USA. There is another extraordinary engine with opposite piston design. The engine produces 30% fewer emissions compared with its counterparts but its design cannot be considered fundamentally new.

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