Tag: Wartsila

Electronic low speed engines added Wärtsilä has increased its offering in the mid-size, low-speed engine sector by adding new 62- and 72-bore low-speed engines with electronic control to its portfolio.The new range is designed to offer high propulsion efficiency, reliability, and optimised total cost of ownership for customers in the bulker, tanker, and feeder container markets. Both engines employ Wärtsilä's standardised low-speed technology, and incorporate electronically-controlled fuel supply and control.The 620mm-bore engine has four to eight cylinders, each with an output of 2,660kW at 97-103rpm. The 720mm version will also be produced with four to eight cylinders, each with an output of 3,610kW at 84-89rpm.The stroke/bore ratio was chosen for good internal efficiency with a gain of 1%-2% compared to current engines, and depending on the vessel type, the lower engine speeds make it possible to improve propulsion efficiency by 2%-6%.As with the 82-bore engine family, the layout fields of both new engines are extended to maintain output, while allowing an increased shaft speed. The extended fields are said to give flexibility to select the optimum propeller speed for low fuel consumption, across a variety of propulsion systems and vessel types.The new engine designs also offer de-rating possibilities, which can ...