What is the function of the intake and exhaust manifold?

The function of the intake and exhaust manifold of Pacific Auto Network is to distribute the combustible mixture provided by carburetor to each cylinder, collect the exhaust gas from each cylinder, send it to the exhaust pipe and muffler, and then discharge it to the atmosphere.

At present, car travel has become the most important travel tool and the first choice for everyone to travel. Today, the car editor needs to give you a brief introduction to the role of the engine intake manifold. The driving of a car also depends on various parts, which are indispensable, and each part has its own function, and the engine intake manifold also plays an irreplaceable role. Let's have a look.

Function of engine intake manifold: For carburetor or throttle body gasoline injection engine, intake manifold refers to the intake pipe from carburetor or throttle body to the intake port of cylinder head. Its function is to distribute the mixture to the intake of each cylinder from the carburetor or throttle body. For port fuel injection engines or diesel engines, the intake manifold only distributes clean air to the intake of each cylinder. The intake manifold must do its best to distribute air, fuel mixture or clean air evenly to each cylinder. In view of this, the lengths of gas channels in the intake manifold should be as equal as possible. In order to reduce airflow resistance and improve intake capacity, the inner wall of intake manifold should be smooth.

The function of intake manifold is to distribute the combustible mixture provided by carburetor to each cylinder. The function of the exhaust manifold is to collect the exhaust gas discharged from each cylinder, send it to the exhaust pipe and muffler, and then discharge it to the atmosphere.

Function of engine intake manifold: Introduction The intake manifold is generally made of cast iron, and the intake manifold is also made of aluminum alloy, which can be cast as a whole or separately. The intake manifold and exhaust manifold are basically bolted to the cylinder block or cylinder head, and asbestos gaskets are installed on the joint surface to prevent air leakage. The intake manifold is equipped with a carburetor with flange, and the exhaust manifold communicates with the exhaust pipe downward.

At present, there are six intake pipes in Jiefang CA6 120Q engine and Dongfeng E6 100Q engine, and the intake pipes are arranged in a rake pattern (streamlined, with low intake resistance), so that each cylinder can take gas independently, which is also conducive to improving the distribution uniformity.

Engine intake manifold function: plastic material requirements for engine intake manifold

1) High temperature resistance: the plastic intake manifold is directly connected with the engine cylinder head, and the temperature of the engine cylinder head can reach 130 ~ 150℃, so the plastic intake manifold material is required to withstand the high temperature of 180℃.

2) High strength: When the plastic manifold is installed on the engine, it needs to bear the vibration load of the automobile engine, the inertia load of the throttle valve and sensor, the pulsating load of the intake pressure, etc. It is also necessary to ensure that the engine will not be crushed by high-pressure pulsation when abnormal backfire occurs.

3) Dimensional stability: The dimensional tolerance of the connection between the intake manifold and the engine is very strict, and the installation requirements of sensors and actuators on the manifold are very accurate.

4) Chemical stability: the plastic intake manifold is in direct contact with gasoline and antifreeze when working. Gasoline is a strong solvent, and ethylene glycol in antifreeze will also affect the properties of plastics. Therefore, the chemical stability of plastic intake manifold materials needs to be very high and must be strictly tested.

5) Thermal aging stability; The working environment temperature of the engine is harsh, and the working temperature changes back and forth between 30 C-130 C. The plastic material must be able to ensure the long-term reliability of the manifold.

So much for today's brief introduction of car editors.

(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)