What is the primary function of the carburetor in an engine?

The primary function of the carburetor in an engine is to mix petrol with air. This process is crucial for proper engine operation because the correct air-fuel mixture allows for efficient combustion within the engine cylinders. The carburetor draws in air through an intake and uses a venturi effect to create a low-pressure area, which atomizes the petrol and mixes it with air. This mixture is then delivered to the engine for combustion, enabling the engine to generate power.

By controlling the ratio of air to fuel, the carburetor plays a key role in ensuring the engine runs smoothly and efficiently under various operating conditions, such as idle, acceleration, and full throttle. This makes it essential for the performance of both two-stroke and four-stroke engines, particularly in older vehicles where fuel injection systems are not used.

While filtering exhaust gases, circulating coolant, and regulating oil flow are important functions in overall engine operation, they do not pertain to the primary responsibility of the carburetor. Understanding the carburetor's role in facilitating the right air-fuel mixture is fundamental for anyone studying engine mechanics or automotive maintenance.