Optimising the Performance of 110cc Engines for Fuel-Efficient Vehicle Design in the Shell Eco-Marathon

Abstract

The Shell Eco-Marathon (SEM) is an internationally recognised competition that inspires higher education students to develop innovative, fuel-efficient vehicle designs, emphasising sustainability and engineering excellence. A major challenge in this endeavour lies in optimising engine performance, particularly for small-capacity engines such as the 110cc, which require precise tuning to achieve superior thermal efficiency and minimal fuel consumption. This study addresses this challenge by developing detailed brake-specific fuel consumption (BSFC) and brake thermal efficiency maps through dynamometer testing of a 110cc engine. The results demonstrated a maximum torque of 7.31 Nm at 5500 RPM, a peak brake power of 5.33 kW at 7500 RPM, and optimal operating conditions at 5000 RPM with a load of 5.42 Nm, achieving a minimum BSFC of 347.3 g/kWh and a maximum thermal efficiency of 23.87%. These findings provide practical insights into the engine’s most efficient operating range, enabling the design of optimised drivetrains that enhance vehicle performance and reduce energy consumption. By harnessing these insights, SEM participants can contribute to advancing sustainable engineering solutions while achieving competitive excellence.