Using Software Simulation for Comparative Analysis of Operating Parameters of V8 and L6 Diesel Engines Having the Same Displacement and Power

The goal of this paper was to estimate a gain in fuel efficiency of a truck V8 turbocharged diesel engine if it is replaced by a L6 diesel engine having the same displacement and power. For this, a V8 engine with two turbochargers and L6 engine with one turbocharger were compared by simulation using the AVL BOOST software. Both engines had a similar torque by the full load characteristic. The factors influencing the fuel efficiency: indicator efficiency, pumping losses, turbocharger efficiency and others were analyzed. The L6 engine demonstrated a uniform pattern of pressure pulsations in the exhaust manifold and at the turbine inlet. The V8 engine had an uneven pattern and higher amplitude of pulsations which resulted in higher pumping losses and lower turbine efficiency. The brake specific fuel consumption of the L6 engine was by 3.5-7.0 percent lower than that of the V8 engine.