Sulzer RTA series

The Sulzer RTA series is a family of two-stroke, low-speed, crosshead marine diesel engines designed by Sulzer, later Wartsila and now WinGD, with bores from roughly 380 to 960 mm including the 960 mm RTA96C once among the most powerful diesels built. RTA engines use a conventional camshaft driving cam-operated jerk fuel pumps and exhaust-valve actuators, so injection timing is set by cam geometry and trimmed by a VIT rack. Uniflow-scavenged and turbocharged, they powered a large share of the world tanker, bulk, and container fleet from the 1980s. The RTA is the mechanical-control predecessor of the common-rail RT-flex, which replaced the camshaft with electronic control.