MAN reports interest in ultra-long stroke

28 Nov 2012
Layout diagram of G-type engine

Layout diagram of G-type engine

MAN Diesel & Turbo says it has received “a healthy interest” in its ultra-long-stroke G-type engine with several new orders, bringing the current number of G-type orders up to 70 just one year after its market release.

The new contracts include orders from Piraeus-based Polembros and U-ming of Taiwan, which have contracted a further six engines, of G70ME-C9.2 type, destined for 186,300dwt Capesize bulk carriers. The engines will be built by Chinese licensee CSSC-MES Diesel (CMD), with the first scheduled for delivery in December 2013 and the remaining five due during 2014. The vessels will all be built at Shanghai Waigaoqiao Shipyard (SWS).

The company says that for a typical Capesize bulker, for which the 6S70ME-C8.2 is a traditional choice, the 6G70ME-C9.2 type offers a 6.5% fuel saving in comparison to the S-engine, of which 4.5% stemmed from the improved propeller efficiency – which is a consequence of the lower rpm – and 2.0% from the actual engine.

The G type’s longer stroke results in a lower rpm for the engine driving the propeller: this lower optimum engine speed allows the use of a larger propeller and is, ultimately, significantly more efficient in terms of engine propulsion. Together with an optimised engine design, this can cut both fuel consumption and CO2 emissions.

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