New diesel engine V28AHX has been launched into the market
- World’s best fuel economy in the class is achieved -

 NIIGATA Power Systems Co., Ltd., (Niigata) has developed the model V28AHX (4,140-6,660 kW) as the high power version of the medium-speed diesel engine 28AHX series (2,070-3,330 kW), Niigata’s main product.
This engine has been developed, incorporating the technologies on the engine performance developed for the in-line type, with the Vee-type for use not only as main propulsion engines but also as large diesel-electric marine propulsion engines and stationary engines. Shipment of this engine will start in 2015, and annual sales of 50 units are projected five years later in 2019. The scale model of this new engine was displayed in SMM 2014, the leading international maritime trade fair, held on September 9 through 12, 2014, in Hamburg, Germany.

 This new Vee-type engine meets the IMO Tier II NOX limit and achieves the world’s best fuel economy in the class as in-line 28AHX engine, a large number of which were produced and delivered as the main propulsion engine owing to its superior performance and light weight and compact design. A 15% reduction in weight is also achieved compared with the conventional engines in the same class by Niigata. Development of this new engine is supported as a part of the by the development program of “the Research and Development of Electrical Propulsion System for Large Supply Vessels” under the technology research and development support program of the Ministry of Land, Infrastructure, Transport, and Tourism (MLIT).

 With the development of this Vee-type engine, the product line of the 28AHX series with the best-in-class fuel economy expanded to 6,660 kW as the single unit output. Owing to the expanded selection in the number of cylinders, flexible adaptation of the engine to the required output becomes possible by changing the number of cylinders while maintaining the interchangeability of the main component. Such a feature of the 28AHX series will make this engine available as the main engine for large offshore support vessels, a prime mover of the electric propulsion system, and a generator set for land use in addition to its primary application in tugboats.

 Niigata continues to supply products to society that are environmentally conscious with the minimum lifecycle costs that include newly developed environmentally friendly V28AHX.

Model V28AHX L28AHX
Application Marine main
propulsion/ generator
Marine auxiliary generator,
Power generation
Marine main propulsion Marine auxiliary generator
No. of cyl. 12/16/18 6/8/9
Cyl. Bore mm 280 280
Piston Stroke mm 390 390
Engine Speed min-1 750 800 720 750 750 800 720 750
Engine output kW/cyl 345 370 350 365 345 370 350