RS-25
Engine
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The Aerojet Rocketdyne RS-25, also known as the Space Shuttle Main Engine, is a liquid-fuel cryogenic rocket engine that was used on NASA's Space Shuttle and is used on the Space Launch System. Wikipedia
Chamber pressure: 2,994 psi (20.64 MPa)
Cycle: Fuel-rich dual-shaft staged combustion
First flight: April 12, 1981 43 years ago (STS-1)
Length: 168 inches (4.3 m)
Manufacturer: Rocketdyne, Pratt & Whitney Rocketdyne, Aerojet Rocketdyne
Mass flow: 1,134.26 lb/s (514.49 kg/s)
Mixture ratio: 6.03:1