Cars have become the most important means of transportation and everyone's preferred choice when travelling. So, what is the role of the engine intake manifold? The operation of a car depends on multiple components, and each one has its own function, including the indispensable role of the engine intake manifold.
Generally, the intake manifold is made of cast iron, and the engine inlet manifold is made of aluminum alloy, which can be cast as a whole or separately. The intake and exhaust manifolds are usually fixed to the cylinder body or cylinder head with bolts, and an asbestos gasket is installed on their mating surfaces to prevent gas leakage. The intake manifold in car engine supports the carburetor by a flange, and the exhaust manifold communicates with the exhaust pipe downwards.
For a carbureted or throttle-body fuel-injected engine, the engine inlet manifold refers to the intake pipe from the rear of the carburetor or throttle body to the front of the cylinder head intake port. Its function is to distribute the air-fuel mixture from the carburetor or throttle body to the intake ports of each cylinder. For an intake port fuel-injected engine or diesel engine, the engine inlet manifold only distributes clean air to each cylinder's intake port. The engine intake manifold must make every effort to evenly distribute air, fuel mixture, or clean air to each cylinder. Therefore, the length of the gas passage in the engine intake manifold should be as equal as possible. In order to reduce airflow resistance and improve intake capacity, the inner wall of the intake manifold should be smooth.
The role of the engine inlet manifold is to distribute the combustible mixture supplied by the carburetor to each cylinder. The role of the exhaust manifold is to collect the exhaust gas from each cylinder, transfer it to the exhaust pipe and muffler, and then discharge it into the atmosphere.
The design of the engine intake manifold is also of great significance. In order to achieve the same combustion condition for each cylinder, the length and curvature of each manifold should be as equal as possible. As the engine operates through four strokes, each cylinder will intake air in a pulsating manner. According to experience, longer manifolds are suitable for low-speed operation, while shorter manifolds are suitable for high-speed operation. Therefore, some car models use variable-length engine inlet manifolds or continuously variable-length intake manifolds to allow the engine to perform better in different speed domains.
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