What is the primary purpose of an air filter in an engine?

The primary purpose of an air filter in an engine is to filter air from dust and debris before it enters the engine. The air filter ensures that only clean air reaches the engine's combustion chamber, where it mixes with fuel to create the combustion process that powers the engine. By removing particulates and contaminants from the air, the air filter plays a crucial role in maintaining engine efficiency and longevity. Dust and debris can cause wear and tear on engine components and lead to reduced performance or even engine damage over time. Therefore, a clean air supply is essential for optimal engine function and performance.

The other options may involve aspects related to engine performance, but they do not directly pertain to the primary function of an air filter. Some may contribute to engine effectiveness, but they do not align with the specific role of the air filter.