FAA Powerplant Written Practice Test

What can be a potential result of operating an engine with inadequate air flow due to a clogged air filter?

1. Increased power output

2. Reduced engine efficiency

3. Improved fuel economy

4. No significant effects

The correct answer is: Reduced engine efficiency

Operating an engine with inadequate airflow due to a clogged air filter can lead to reduced engine efficiency. The air filter's primary function is to remove dirt and debris from the air entering the engine, which is crucial for maintaining optimal combustion. When the airflow is restricted because of a clogged filter, the engine does not receive the necessary amount of air to mix with fuel for efficient combustion. This reduction in airflow can cause several issues, such as incomplete combustion, which in turn leads to a less efficient engine operation. The engine may struggle to produce the power it is designed for, often working harder and longer to achieve desired performance levels, ultimately leading to poor fuel utilization. As a result, the engine may experience a decrease in overall performance and an increase in exhaust emissions. In summary, inadequate airflow due to a clogged air filter indeed leads to reduced engine efficiency, affecting performance and fuel usage adversely.