In a mechanical governor system, increasing engine speed affects which part first?

In a mechanical governor system, increasing engine speed first affects the flyweights. These flyweights are a crucial component of the governor mechanism. As the engine speed increases, the centrifugal force acting on the flyweights causes them to move outward. This movement serves as the initial response to changes in speed and is what ultimately triggers adjustments in the other components of the governor system.

Once the flyweights move outward due to increased speed, their position affects the governor arm and the spring linkage, which subsequently leads to the adjustment of the throttle plate to regulate the airflow and fuel into the engine. However, the flyweights react immediately to changes in RPM, making them the first part of the system to respond to increased engine speed. This mechanism is essential for maintaining the desired engine performance and stability.