Sulzer RT-flex

The Sulzer RT-flex is a two-stroke, low-speed, crosshead engine that is a common-rail, electronically controlled version of the Sulzer RTA, designed by Wartsila and now WinGD. It removes the camshaft and its cam-driven jerk fuel pumps and exhaust-valve actuators, replacing them with a high-pressure common rail charged by engine-driven supply pumps and solenoid-controlled injection and exhaust-valve units. Because injection timing and quantity per cylinder become software functions, the engine holds high injection pressure at low load and gives steadier slow-steaming combustion, lower smoke, and selectable economy or low-NOx tunings. It was the first commercial common-rail two-stroke, the architectural counterpart of the MAN ME engine.