Based on RPM:
* The "Ultra-High Speed" engine: This engine, developed by Sandia National Laboratories, can reach 1.2 million RPM. It's designed for research purposes and is extremely small (less than an inch in diameter).
* The "Wankel rotary engine: This engine, famously used in Mazda vehicles, has a higher power-to-weight ratio than a piston engine and can achieve high RPMs. While not the fastest in terms of pure RPM, it's known for its high speed capabilities.
Based on power output:
* Rocket engines: These engines, used in spacecraft, are incredibly powerful, generating thrust that propels objects at extremely high speeds. The RS-25 engine used in the Space Shuttle, for instance, produces 3.8 million pounds of thrust.
* Jet engines: These engines, used in aircraft, also generate significant thrust, allowing for very high speeds. The GE90-115B engine, used on Boeing 777 aircraft, is the most powerful jet engine ever produced, generating 115,000 pounds of thrust.
Based on specific application:
* Formula 1 engines: These engines, specifically designed for racing, are incredibly powerful and rev very high, often reaching 15,000-20,000 RPM. However, they are highly specialized and not designed for everyday use.
Ultimately, the "fastest engine" depends on what criteria you're using to define "fast." For pure RPM, the Ultra-High Speed engine is likely the winner. For power output, rocket engines and jet engines take the crown. And for specialized performance, Formula 1 engines hold the record.
