An engine dynamometer is a device used to measure the power output and performance of an engine. It works by applying a load to the engine while measuring parameters such as torque and RPM (revolutions per minute). This data helps engineers and manufacturers assess engine efficiency and make necessary adjustments. There are two main types of engine dynamometers: absorber dynamometers and in-line dynamometers. Absorber dynamometers use a braking system to create resistance, while in-line dynamometers are connected directly to the engine's output shaft. Both types are essential tools in automotive testing and development, ensuring engines meet performance standards.