A fast ferry version of the engine has been progressively refined since entering service in 1990, with aluminium alloy specified in non-stressed areas and fabrications replacing castings where feasible. ![]() ![]() The RK270 retained well-proven features of its predecessor but exploited new components to underwrite a higher performance and achieve enhanced lightness and compactness. The RK270 engine entered service in 1982, the 270 mm bore/ 305 mm stroke design inheriting the pedigree of the 254 mm bore RK series which originated in the 1930s and continued in the programme as an upgraded RKC series also with a 305 mm stroke. ![]() A programme embracing three medium speed designs-the RK215, RK270 and RK280 series-was developed and produced by Ruston Diesels, a pioneering British enginebuilder which was a member of the Alstom Engines group until acquired by MAN B&W Diesel AG of Germany in June 2000.
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