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Injector nozzle coking can severely limit engine performance by limiting the amount of fuel delivered to the combustion chamber and altering the spray pattern. Injector nozzle coking is also one of the most sensitive measures of diesel fuel quality. Formation of deposits within the holes of the injector nozzle or on the outside of the injector nozzle may have an adverse effect on overall system performance. There is no single factor that results in nozzle coking but can be classified in four major areas e.g. spray hole geometry, application duty cycle, nozzle localized temperature and the fuel quality. This paper provides a critical review of the current understanding of the main factors affecting the deposit formation. Engine was tested by motoring dynamometer using test cycle generated by Cummins Inc, as an attempt to try to simulate field conditions.

Fracture split connecting rod has developed for commercial diesel engines for its advantage in improve engine performance and reduce production costs. Engine up rating is done as the need is arise for more energy output from the same volume of the cylinder. This connecting rod is made of high carbon micro-alloyed steel with controlled cooling and the blank is forged in one die mold and later fracture splitted. This connecting rod needs no additional rod and Cap contact face milling which means a substantial savings in Machining cost. A better contact between rod and cap improves stiffness and compatibility with crank train moving parts. This connecting rod is designed for Brake Main Effective Pressure (BMEP) 2.0 MPa and peak firing pressure of 180 bar. Analysis and optimization are done for tensile and compressive strength in both max. torque and over speed condition.