What's The World's Largest Engine?

This is the GE90-115B, the world's biggest jet engine. It's 18 feet long, 11.25 feet wide, and it weighs 18,260 pounds. It's set a world record for producing 127,900 lbf of thrust. Can you find a bigger engine?

Yes, we're looking for the world's biggest engine. Feel free to post biggest by whatever measure you seem appropriate.

Do you know the world's largest piston engine? Awesome. Do you know history's largest rocket engine? Sweet. Do you know the biggest engine ever fitted to a supersonic plane? Post it. We'll put them all together a reasonably comprehensive top ten tomorrow.

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Photo Credit: GE