A system and methods for a vehicle are provided for adjusting each of a speed of a radiator fan and a position of grille shutters of the vehicle responsive to a temperature at a wastegate exceeding a temperature threshold. In one example, a system may include a radiator fan at a front end of a vehicle, an engine coupled to an exhaust passage, a turbine in the exhaust passage having a bypass conduit, a wastegate positioned in the turbine conduit, and the wastegate receiving airflow from downstream of the radiator fan via a cooling duct.

A hollow poppet valve (10) is provided with an additional flange shape cavity (S1a), in addition to an ordinary valve head cavity (S1) formed in the valve head (14) of the valve (10) in communication with a valve stem cavity (S2) formed in a valve stem (12). A coolant (19) is loaded in the cavities to facilitate dissipation of heat out of the valve. This flange shape cavity (S1a) extends radially outwardly round a bottom portion of the valve head cavity (S1), extending close to a valve seat, thereby significantly facilitating heat transfer between the coolant (19) and the valve seat of the valve, yet, since the flange shape cavity (S1a) does not influences the thickness of other regions of the valve, it does not degrade durability of the valve.

A cooling air intake device is mounted to a frame of a vehicle and includes a base plate and an intake box. The intake box is mounted on the base plate that includes a first admission section and a blocking section adjacent to the first admission section. The intake box includes a first intake compartment and a second intake compartment. The first intake compartment corresponds to the first admission section of the base plate. The first intake compartment includes a first baffle plate mounted therein. The first intake compartment has a side wall in which a first discharge section is formed. The second intake compartment is arranged above the first intake compartment in such a way that a second baffle plate is arranged between the first intake compartment and the second intake compartment. The second intake compartment includes a second admission section and a second discharge section.

A cooling air intake device is mounted to a frame of a vehicle and includes a base plate and an intake box. The intake box is mounted on the base plate that includes a first admission section and a blocking section adjacent to the first admission section. The intake box includes a first intake compartment and a second intake compartment. The first intake compartment corresponds to the first admission section of the base plate. The first intake compartment includes a first baffle plate mounted therein. The first intake compartment has a side wall in which a first discharge section is formed. The second intake compartment is arranged above the first intake compartment in such a way that a second baffle plate is arranged between the first intake compartment and the second intake compartment. The second intake compartment includes a second admission section and a second discharge section.