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ENGINES AND GENERATING SETSTypical BSFC curves to illustrate Standard Tuning,Delta Tuning, Delta Bypass Tuning and Low-Load TuningThe BSFC guarantee is possible at several load points between50–100%.Standard Tuning, Delta Tuning, Delta Bypass Tuning and Low-LoadTuning are available for all Wärtsilä low-speed diesel engines to provideoptimum fuel consumption and flexibility for different engine loads. DeltaTuning focuses on reducing fuel consumption in the operating rangebelow 90% engine load. Delta Bypass Tuning provides increased steamproduction between 50 and 100% engine power. Low-Load Tuningreduces fuel consumption below 75% engine load.Dual tuning is available on request and in cooperation withClassification Societies.Cylinder lubricationThe Pulse Lubricating System is the standard for the 2-stroke engineportfolio. It electronically controls the injection timing and the loaddependent feed rate.The feed-rate set point can be adjusted between 0.6 g/kWh and1.2 g/kWh. The actual feed-rate is dependent on the residual BN takenfrom the drain oil samples coming from the piston underside. Thisincreases the safe operation of piston running performance againstthe negative influences from the Sulphur content in the fuel, ambientconditions, and other detrimental factors.The graph below illustrates the theoretical sulphur dependentfeed-rates based upon BN 100 cylinder lubrication oil. These threemeasured points represent various engine feed-rate settings, whichhave been adjusted according to the unique results from the pistonunderside drain oil analysis of each engine.84