Engine testing is the process of evaluating the performance and reliability of an engine under various conditions. This testing helps engineers identify any issues, measure efficiency, and ensure that the engine meets safety and regulatory standards. It typically involves running the engine on a dynamometer, which measures power output and other critical parameters. During engine testing, different factors such as fuel type, temperature, and load conditions are varied to assess how the engine responds. This information is crucial for improving engine design and performance, ultimately leading to better vehicles and machinery, including those used in automotive and aerospace industries.