What is the primary function of the exhaust manifold?

The primary function of the exhaust manifold is to collect and direct exhaust gases from the engine cylinders. It plays a critical role in channeling the exhaust gases, which are produced during the combustion process in the engine, to the exhaust system. This allows for the efficient removal of these gases from the engine, which is essential for maintaining optimal engine performance and reducing emissions.

By gathering exhaust gases from multiple cylinders and directing them through a single outlet, the exhaust manifold ensures that the gases are expelled properly from the engine. This action not only helps in preventing a buildup of pressure within the engine, which could lead to inefficiency or damage, but also contributes to effective routing of the gases to components like the catalytic converter, which further processes the exhaust before it is released into the atmosphere.

The other functions mentioned, such as regulating the air-fuel mixture, controlling engine temperature, and filtering fuel impurities, are duties handled by different components of the engine system, such as the fuel injectors, cooling system, and fuel filter, respectively. Thus, the role of the exhaust manifold is specifically focused on exhaust gas management.