FAA Powerplant Written Practice Test

Which of the following is a requirement for carburetor synchronization on a light sport aircraft?

1. Only idle speed adjustment is necessary

2. The engine should be cold during synchronization

3. Both carburetors must be checked at high rpm

4. Mechanical synchronization should occur before any other adjustments

The correct answer is: Mechanical synchronization should occur before any other adjustments

Mechanical synchronization of carburetors is critical in ensuring that both carburetors are working in harmony to provide optimal performance for the engine. This process involves adjusting the throttle linkages and ensuring that both carburetors open and close simultaneously in response to throttle movement. When the carburetors are synchronized mechanically, it sets a solid foundation for further adjustments like idle speed or mixture settings, enabling the engine to operate smoothly across various power settings. Performing mechanical synchronization before any other adjustments is essential because if the carburetors are not synchronized, any subsequent adjustments may not yield the desired results or could lead to uneven running characteristics. Therefore, establishing correct mechanical synchronization contributes to balanced airflow and fuel delivery to the engine, promoting efficiency and reliability in light sport aircraft. Moreover, it is beneficial to perform this synchronization with the engine warm, as components might expand and perform differently when heated. Therefore, monitoring performance at high RPMs later on is crucial, but it hinges on the initial correct mechanical setup.