Feature 2 | HIGH-SPEED DIESEL ENGINES
genset market at 540ekW-800ekW in 1500rev/min 50Hz installations, and at 625ekW-910ekW in 1800rev/min 60Hz duty. Conf igured as a vee-12, twin
turbocharged and aſter-cooled engine, the C32 ACERT is modelled on the Cat 3412, drawing on the latter’s attributes as regards durability and reliability. The new type is compliant with US
EPA and EU marine emission regulations as well as those of IMO, and the reduced pollutant impact includes a claimed virtual absence of smoke or soot. Comparing maximum power outputs,
the C32 ACERT can deliver more power than either the 3412E or the C32 Tier I engines, while being similar in size and weight due to a ‘V’ block design. Te mechanically-actuated, electron-
ically-controlled unit injection (MEUI) system, along with the specially-designed camshaſt, ensures precise control over the high-pressure injection. Te new A4 electronic control unit (ECU) technology coordinates the combustion process, and has increased processing power, memory, and fuel mapping capability relative to the preceding A3 device.
Successful application In the buoyant newbuild sector for large yachts or superyachts, among the first C32 ACERT engines to be commissioned at the new, high-performance E-rating were the two units installed in Moonen Shipyards’ 28m Nilo. Te plant imbues the aluminium yacht with a top speed in excess of 26knots, some 1.5knots more than expected, in addition to the requisite acceleration properties. Dutch builder Moonen’s production programme includes a 30m aluminium design, for which twin Cat C32 ACERT engines have also been specified. The Caterpillar marque has long
found wide favour in the Dutch marine industries, and a recent new expres- sion of that receptivity is provided by the nomination of the 3512B high-speed diesel for the innovative Damen Fast Crew Supplier 5009 Axe Bow class of workboat. Four 3512B engines ensure a top speed
of 30knots, and the (WOSR) wide operat- ing speed range characteristic provides
32
Cummins’ QSK 38 (pictured) and the QSK50 comply with 2007 US EPA Tier 2 and EU stage IIIA emission regulations.
a f latline power curve from approxi- mately 1200rev/min to 1800rev/min. Damen’s two smaller FCS designs also rely on Cat power. UK-based producer Perkins Sabre
achieved another important export reference last year for its M130C natural ly-aspirated marine diesel through the re-powering of an Austral- ian commuter ferry. Two new examples of the six-cylinder
design, each producing 130hp (96kW) at 2600rev/min, replaced a pair of older units of the type that had clocked up over 43,000 service hours. Re-engining was central to the decision to extend the life of the ferry, the 148 passenger- capacity Shelly Taylor-Smith, which makes 30-40 crossings per day of the Swan River in Sydney. The original engines were reported
to have required nothing more than routine servicing over 10 years’ intensive utilisation. The fact that the design achieves maximum output at what is described as a ‘low-stressed’ 2600rev/ min had a signal bearing on the decision to keep faith with the M130C for the re-power scheme. Three other models are available in the Perkins Sabre range for marine propulsion applications, up to the M215C type, turning out 158kW (215hp) at 2500rev/min.
Alternative fuels Volvo Penta is a partner in an evalua- tion programme for Neste Oil’s second generation of biofuel, which is reckoned to have considerably improved features relative to its predecessor. Developed by the Finnish energy group, NExBTL (Next Generation Biomass to Liquid) is a new bio-based diesel fuel claimed to offer quality and performance at least equivalent to that of conventional fossil fuel-derived diesel. As part of a larger EU-backed
research project, NExBTL is to be tested for a period in two Volvo Penta- powered Waxholm passenger boats operated in the Stockholm area. Volvo Penta engineers will follow-up the in-service tests, studying the emissions performance while investigating the affects of the fuel on the engines. The project is scheduled to last for three years, from an implementation date towards the end of 2007. The first of two NExBTL renewa-
ble diesel product ion plants to be establ ished at Neste’s Porvoo ref inery in Finland was completed in the summer of 2007. The second Finnish unit is due to be opened in 2009, fol lowed by a plant in Singapore, expected to be ready by the end of 2010. SBI
Ship & Boat International May/June 2008
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