In the early 1970s, Spanish inventor Arturo Estévez Varela introduced a pioneering engine powered by water — a concept that held the potential to revolutionize automotive technology. Despite its ...

One of the major driving forces behind the pursuit of green energy sources in the last few decades has been the relative scarcity of oil around the world. Because it is very gradually becoming more ...

Astron aerospace has shown a partial prototype of a new rotary combustion engine it claims runs at an extraordinary 60% thermal efficiency, burning totally clean with zero NOx emissions and nothing ...

Many motorcycle engines might rely on liquid or air cooling. These different styles both have some pros and cons depending on ...

Learn how a water-cooled solenoid engine works and see its design and operation in action. This video breaks down the ...

Air engines are a common occurrence here on Hackaday. They’re relatively novel and reasonably easy to 3D print without requiring any fluids or supporting machinery. For example, [Tom Stanton] took a ...

A furnace heats the base of one boiler-cylinder to 900° F. (688° above water’s boiling point). The superheated water expands (but cannot change to steam because it is too closely confined) and pushes ...

Intake, compression, power, then exhaust. Every 4-stroke engine ever made – about 80% of all engines currently in existence – function on this principle – even rotary engines. But now, Porsche has ...