In this thesis the methodology for performance optimization of a three cylinder internal combustion engine is presented. The engine is meant to be used in the Formula Student competition series. The optimization is based on numerical analysis of intake and exhaust system geometry variation. The numerical model of the whole engine is first validated with the data measured in the most relevant specific operating points, which presents the basis for estimating the improvement of engine performance due to variation of the intake and exhaust system geometry. Results reveal the following main conclusions:
- The primary intake pipe geometry has the largest impact on the scavenging efficiency.
- Whole intake system geometry generally has a greater influence on cylinder scavenging than the exhaust system geometry.
- With geometry optimization, it is possible to improve the engine`s performance characteristics and increase the engine`s maximum power all in one.
- Intake air restrictor drastically decreases volumetric efficiency of the cylinders at crankshaft speeds above 10000 min-1.