Uprated MAN Diesel V28/33D Tier-II engine launched

The new version of MAN Diesel’s 28/33D engine boasts an improved design and is available in 12-, 16- and 20-cylinder versions, with respective power outputs of 5,460, 7,280 and 9,100 kW. With a 10% overload possible for one hour every six hours, these outputs rise to 6,000, 8,000 and 10,000 kW respectively, thereby making the 20-cylinder version the first 10 MW engine at 1,000 rpm.

The V28/33D engine features state-of-the-art design and has the highest power density in its class while maintaining full compliance with IMO-II and EPA Tier-II legislation. Its compact design is tailored for three main segments: multiple propulsion applications, including all types of fast ferry, naval ships, super-yachts, an STC edition; and as gensets for offshore applications.

Additional design features include the new, in-house-developed, engine-mounted SaCoSone safety and control system, and the new, TCA33 turbocharger, which has been especially tuned for the V28/33D engine as it is a light, high-efficiency turbocharger with a compact design.

Other, major design optimisations include a one-part air-manifold of symmetrical design, an optimised crankshaft design with reduced stresses and improved lubrication, and an oil sump with increased volume to accommodate inclination requirement. A rolling dynamic of 22° and pitching static of 5° are allowed with an additional dynamic of +/- 7.5° while an improved connection rod with a straight-cut design gives high reliability, better balance and lower engine vibrations

The challenge of meeting new emissions regulation (IMO II and EPA Tier II), while maintaining the excellent fuel-consumption and smoke-emission levels enjoyed by the 28/33D, has been achieved through the intensive development of an ‘Emission Tier II package’. This includes an optimised injection system, a combustion chamber, Miller cycling, a high-efficiency charge-air cooler and an improved NOx/SFC/soot trade-off.

The new engine is available in an STC (Sequential Turbocharging) version that offers optimal engine-turbocharger matching. For naval applications in particular, this gives the engine an extended torque envelope that offers economical operating modes and improved engine-acceleration characteristics. The MAN Diesel STC system consists of two identical, standard turbochargers, one providing copious charge-air at low- and medium-speed, with the second cutting in at higher speeds.

MAN Diesel is simultaneously introducing the genset versions of the V28/33D engine to the market, tailor-made for the offshore segment. Special features include fast starting possibility, high loading step, integrated design with reduced interface, high dynamic load response and will be easy to install owing to several factors.