Swiss-based engine designer WinGD (Winterthur Gas & Diesel Ltd) has unveiled four new short-stroke engines to address economic engine speeds and accommodate space constraints on several vessel types, including ro-ros.
The range, starting with the X52-S2.0 and X62-S2.0 and their dual-fuel counterparts X52DF-S1.0 and X62DF-S1.0, feature a short piston stroke that is claimed to be ideal for vessels with a shallow draught, small propeller diameter or low main deck height.
For the new X62-S2.0 and X62DF-S1.0 engines, the piston stroke has been reduced by 413 mm compared to the standard X62 and X62DF– offering a substantial saving in the engine room deck head height needed for installation, the company said.
“Our new short-stroke engine series offers a tailored solution for smaller vessels that still require the efficiency and power of 2-stroke marine engines,” said Volkmar Galke, Global Director, Sales, WinGD. “Many of these vessel types are part of an ageing fleet that means we expect significant fleet renewal – and a big opportunity for our new engines – over the next few years.”
As well as making the engines more compact, the new stroke-to-bore ratio also reduces manufacturing and component cost. Along with design improvements to reduce maintenance and cut operating costs, the new liquid fuel engines will be fitted with an integrated selective catalytic reduction (iSCR) system. They will be among the first engines to offer the new, compact solution to meeting IMO Tier III NOX limits, the company claimed.
“Both the iSCR and the short-stroke series highlight our commitment to simplifying engine installation for shipyards and therefore reducing costs for owners and operators,” Galke added.
The X62-S2.0 engine has a cylinder bore diameter of 620 mm and a piston stroke of 2,245 mm –compared to a stroke of 2,658 mm on the standard X62 – with a maximum continuous power of 2,685 kW per cylinder at 108 rev/min. It will be available with five to eight cylinders, covering an overall power range of 7,600-21,480 kW at 85-108 rev/min.
The X62DF-S1.0 engine has similar dimensions and a maximum continuous power of 2,110 kW per cylinder, for an overall power range of 6,925-16,880 kW.
As for the X52-S2.0 engine, this has a cylinder bore diameter of 520 mm and a piston stroke of 2,045 mm, with a maximum continuous power of 1,910 kW per cylinder at 120 rev/min. This engine will be available with five to eight cylinders, covering an overall power range of 5,425-15,280 kW at 95-120 rev/min.
The X52DF-S1.0 version has a maximum continuous power of 1,500 kW per cylinder and covers an overall power range of 4,950-12,000 kW.
The first of the new engines, a six-cylinder version of the X62-S2.0 engine, will be tested at the end of 2021, while the first X52-S2.0 engine will follow six months later.