SpaceX Merlin
Rocket engine
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Merlin is a family of rocket engines developed by SpaceX for use on its Falcon 1, Falcon 9 and Falcon Heavy launch vehicles. Merlin engines use RP-1 and liquid oxygen as rocket propellants in a gas-generator power cycle. Wikipedia
Diameter: Sea level: 0.92 m (3.0 ft); Vacuum: 3.3 m (11 ft)
Throttle range: Sea level: 845 to 482 kN (190,000 to 108,300 lbf) (57%); Vacuum: 981 to 626 kN (220,500 to 140,679 lbf) (64%)