The main functions of the intake mixing pipe include: Intake: Introducing outside air into the engine system through the intake pipe. Mixing: In the intake mixing tube, air and fuel are mixed to form a flammable mixture. Delivery: Delivers the mixture into the engine's combustion chamber to support the combustion process. Gravity casting creates fewer pores and internal defects, which is important to ensuring the integrity and durability of the intake manifold. Lower porosity helps avoid gas leakage and ensures stable engine operation. Gravity casting is a relatively efficient casting method that can produce large quantities of parts in a relatively short period of time, ensuring a sufficient supply of engine parts.