By Displacement (the volume of the cylinders):
* Wärtsilä-Sulzer RTA96-C: This massive marine engine, used in container ships, has a displacement of 25,480 liters (1,550 cubic inches). It's the largest engine ever built in terms of displacement.
By Power Output:
* General Electric's GE90: This jet engine, used on Boeing 777 aircraft, produces a maximum thrust of 127,900 pounds. While not the largest by displacement, it is the most powerful engine ever certified for commercial use.
By Physical Size:
* The Big Bertha: While not an engine in the traditional sense, this German siege gun built in World War I had a massive barrel, measuring 28.6 meters (94 feet) long.
Other Considerations:
* Rocket Engines: Engines designed for space travel can be incredibly powerful and are technically "engines," but they are often very different from traditional combustion engines.
Ultimately, the answer to "what is the biggest engine" depends on your definition of "biggest." Do you want the largest displacement, the highest power output, or the most physically imposing?
