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- Squish Band Influence on a Piston Ported 2-Stroke Engine PerformancePublication . Silva, Vítor Alexandre Pinheiro da; Brojo, Francisco Miguel Ribeiro ProençaTwo-stroke engines are widely used worldwide in applications where lightweight design, high power-to-weight ratio, and simplicity are essential. Common modern uses include motorcycles, marine engines, and small machinery. In the aeronautical sector, they are especially valuable in unmanned aerial vehicles (UAVs) for both civilian and military purposes, where their high power-to-weight ratio is critical for performance. They are also used in ultralight aircraft, aeromodelling, and experimental aviation due to their compact design and cost-effectiveness. Advances in technology continue to improve their performance, solidifying two-stroke engines as a reliable and indispensable part of both aviation and the entire transport sector. This study intends to analyse the influence of the squish band on the combustion efficiency and performance of two-stroke engines. For that, a small 50cc two-stroke piston ported SI engine was designed from scratch to serve as the base for the analysis. The squish band of the designed engine was then altered in three different characteristics: the gap to the piston crown at top dead center (TDC), the angle of the squish band and the percentage of the piston’s bore area where a squish band was present. With these modifications, a total of six different variations of the base engine were created and analysed. The numerical simulations were performed in ANSYS Fluent. In this CFD software, the engine’s motion through its cycle and the species movement and combustion were modelled and the different calculations were computed. The results revealed that the designed engine performed as expected and the different squish band variations provided interesting results.