What are the materials used for the intake manifold? Why?
Due to the high temperature around the engine parts at work will be 220 degrees and still has high modulus, high strength, at -40 degrees still have good mechanical properties and no cracks toughness for glass fiber reinforced nylon is not the best material. Abroad has useful PPA resin (P o er you first amine) molding used to manufacture automobiles manifold, and has been applied to the Corvette, kamailuo, Firebird models LS1 and LS6 engine with intake manifold. This type of intake manifold is usually designed in three parts and bolted together to the engine. Under high temperature and high humidity, the tensile strength of PPA is 20% higher than nylon 6, and higher than that of nylon 66. In addition, the flexural (flexural) modulus of the PPA material is 20% higher than that of nylon, greater hardness, and more resistant to tensile creep for a long time. PPA has a better ability to resist gasoline, grease and coolant than PA. The most important thing is to reduce weight, intake manifold with aluminum manufacturing, weighs 26 pounds, and with PPA resin molded into three pieces of the same type of intake manifold air weighs less than 11 pounds, can produce 25% more. Moreover, the cast aluminum products will also heat the inhaled air and reduce power. As the plastic is a poor conductor of heat, it is insulated.
The intake manifold for automotive powertrain systems has always been made of metal. Because of the complex shape of the manifold, it was made of aluminium alloy before, but the inner wall is rough. The resistance to air is very large and noise is large when it is used. The combustion is not enough and the exhaust gas is exhausted. At the beginning of the last century in 80s, Europe began to lose core manufacturing method (CoreMelt), so the manifold made of not only the high cost, but also some scrap, because manifold materials of PA66 (or PA6) reinforced by glass, the processing temperature at 250 to 260 degrees Celsius, while the contact time in mold and core only a few minutes, but part of the core will inevitably be melting, the size of the inner wall manifold is difficult to control. In recent years, due to the development of vibration welding technology, the welding technology of large-size glass fiber reinforced PA66 becomes more and more mature. For this reason, the manifold can be molded into two MANIFOLD Parts by vibration welding and become one. Most manufacturers in the world use this method to produce manifolds to make metal manifolds plastic.
