tætningsforhold

Tætningsforhold, also known as compression ratio, is a critical parameter in the design and operation of internal combustion engines, particularly those utilizing the Otto cycle, such as gasoline engines. It refers to the ratio of the volume of the combustion chamber when the piston is at its closest position (top dead center) to the volume when the piston is at its farthest position (bottom dead center). A higher compression ratio generally results in more efficient combustion, as it increases the temperature and pressure within the cylinder, promoting better fuel ignition and power output. However, excessively high compression ratios can lead to engine knocking, pre-ignition, or even engine damage due to the increased stress on the components. The optimal compression ratio is a balance between efficiency and durability, and it is typically determined through a combination of engineering calculations, testing, and empirical data. In modern engines, compression ratios often range from 8:1 to 12:1 for gasoline engines and can be even higher for diesel engines.