Why can't the compression ratio be increased too high?

[AthenaLee]

Increasing the compression ratio too high can easily cause knocking. A high compression ratio is one of the factors that lead to knocking. For engines of the same displacement, a higher compression ratio results in better power and fuel economy. However, there are limits to everything. Simply increasing the compression ratio to pursue high performance while ensuring normal operation presents exponentially increasing difficulties. Below is an introduction to compression ratio: 1. The compression ratio is a parameter that can basically reflect the efficiency of an engine. For naturally aspirated engines, without considering other factors, an increase in the compression ratio means that the engine's performance and efficiency are also improved accordingly. 2. However, the compression ratio cannot be increased too high because it can cause knocking in gasoline engines. This phenomenon can severely affect the working life of gasoline engines, so it is often necessary to use higher-octane gasoline to reduce the likelihood of knocking.