Feature 2 | HIGH-SPEED DIESEL ENGINES
standard, MTU has also carried out a study to evaluate the future potential of the series 4000 engine concept. Te series 4000 was the first off-highway engine series introduced with common-rail injection as standard, and entered full production in 1997. In the marine sector, the design has found favour in fast ferries, yachts, authority vessels, and others. In a presentation on the series 4000 at
CIMAC 2007, MTU said that a long-stroke version had been developed, wherein the stroke had been increased to 210mm, as ref lected in engine deliveries through 2007. However, for marine engines with higher running speeds, the original stroke of 190mm is being retained, albeit with a larger bore of 170mm, compared with 165mm hitherto. In future, all series 4000 diesel and gas engines will be of 170mm bore. Investigations revealed scope for a 26%
power increase to 215kW/cyl at a higher speed of 2170rev/min, with an increase in mean effective pressure to 27.4bar. Notwithstanding the significantly higher output and lower noxious emissions, fuel consumption has been kept in check. Apart from a moderate amount of
component modification, no further measures were required to retain the safety factors proven with the existing series. Te combustion development showed that fuel consumption could be kept constant for applications with low load factors (the M93 models of the series 4000), and could be reduced for applications with high load factors (the M73 models). Similarly good results were achieved for particulate matter (PM) emissions. Te 12V and 16V versions of the series
4000 now cover the 1920kW-3440kW power band. In addition, a 20-cylinder engine has been developed, taking the unit power range to 4300kW. Te trial phase began with the 20V prototype in Septem- ber 2006, and an intensive test programme was conducted through 2007. Series delivery of 20V engines was expected to start in April or May 2008.
Research and development MTU is unequivocal as to the commer- cial importance of the environmental performance of its engines. As well as high power-to-weight ratios and high power
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The MTU 20V4000 M93L engine.
densities, emissions and consumption are increasingly becoming the market- shaping factors influencing high-speed diesel engine development and business success. Until recently, R&D investments by
MTU in key technologies focused on fuel injection systems, turbocharging, and engine electronics, and on materi- als and strength issues. MTU has now added exhaust aſter-treatment to its key technologies for in-house development. Te rationale for this is that the company believes that future exhaust emission limits will call for widespread application of exhaust aſter-treatment technologies. Terefore, while the R&D strategy covers
further development of turbocharger and injection technologies and electronic governing and monitoring devices, the intention is to be able to deliver exhaust aſter-treatment systems as part of MTU’s off-highway product portfolio. Te company has also recently taken
steps to expand its core competencies in the propulsion system business through the development of new engine mounting arrangements in conjunction with the companies Paulstra and Stop-Choc. Te innovative concept of ‘active’ mountings has been successfully trialled at sea as well as on test benches, and is claimed to significantly reduce structure-borne noise from diesel engines. The new active mountings support
and augment the special, passive rubber mountings, and render the latter’s noise suppression far more effective. Te innova- tive nature of the concept is that the active mountings create sound waves with the same amplitude and opposite polarity to the original structure-borne noise waves of the engine. Tis technology, whereby noise and anti-noise largely cancel each other out, is being applied to marine diesel engines for the first time. Te concept has now reached product
stage in application to large yachts and naval ships. MTU has entered into an exclusive distribution agreement with Paulstra and Stop-Choc for the active engine mountings.
Emission compliance In addition to being moulded to clients’ rising expectations as to reliability, durability, and competitive ownership costs, Cummins’ QSK38, and QSK50 marine engines have been designed to ensure compliance with 2007 US EPA Tier 2 and EU Stage IIIA emission regula- tions. The Quantum System family builds
upon the reputation of the well-established KTA19, KTA38, and KTA50 designs. Te QSK19 was the first of the new breed to be introduced, ensuring continuity in the 19litre displacement sector, and the 38litre QSK38 and 50litre QSK50 may be viewed as the long-term successors to the KTA38
Ship & Boat International May/June 2008
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