Air induction port system for internal combustion engines has exhaust gas return passage made in one piece with casing, and exhaust gas return valve and throttle valve are constructed as cartridge valve for insertion in holes in casing

摘要

The air induction port system (1) comprises a casing (2) with an upper (3) and lower (4) shell interconnected to form an induction manifold (5). The system has an exhaust gas return valve (29), an exhaust gas cooler, exhaust gas return passage (7), and an exhaust gas guiding device through which exhaust gas is directed into the induction manifold. A throttle valve (40) regulates the amount of air drawn in and is rigidly connected to the air induction port system. The exhaust gas return passage is made in one piece with the casing, and the exhaust gas return valve and throttle valve are constructed as a cartridge valve which can be inserted in corresponding holes in the casing.