Optimisation of Gas Exchange Process on a Single Cylinder Small 4-Stroke Engine by Intake and Exhaust Tuning: Experimentation and Simulation

A 1-D Thermodynamic analytical model is developed using commercially available code, to study the gas-exchange process in a 125cc, single cylinder 4-stroke engine. Model is validated against the experimental results by comparing the pressure traces inside the cylinder, intake and exhaust pipe. Detailed parametric study has been conducted using the analytical model to optimise the valve timing, elements of intake and exhaust manifold.

Design of experiment (DOE) technique is used to find the effect of individual parameter and optimum combination is obtained for the desired performance level. The results from analytical predictions are in good agreement with the experimental results for the optimised combination.