What is the function of the exhaust manifold in an engine?

The function of the exhaust manifold is to collect exhaust gases produced during the combustion process from the engine's cylinders and direct them into the exhaust system. As the fuel ignites in the cylinders, it creates gases that need to be expelled to maintain engine efficiency and prevent damage. The exhaust manifold is typically made from cast iron or stainless steel and is designed to withstand high temperatures.

By efficiently collecting and channeling these gases away from the engine, the exhaust manifold helps reduce back pressure, which can improve engine performance. Additionally, it plays a role in optimizing the flow of exhaust gases, which can influence turbocharger efficiency in turbocharged engines. Understanding this function helps in comprehending how the exhaust system contributes to the overall performance and emissions management of the vehicle.

The other options describe components and functions that don't relate to the exhaust manifold—such as cooling systems, fuel vaporization, and oil filtration—making them unsuitable in this context.