Abstract: A air supplying structure for multi-cylinder engine comprising six pieces of high-pressure stage superchargers 51, six pieces of low-pressure stage superchargers 52, two pieces of intercoolers 63 arranged between the high-pressure stage and low-pressure stage superchargers, and six pieces of aftercoolers 62 arranged between the high-pressure stage superchargers and cylinders, in which each high-pressure stage supercharger 51 is connected with three pieces of cylinders, each aftercooler 62 is connected with each high-pressure stage supercharger 51, the two pieces of intercoolers 63 are arranged at opposite sides of the engine body 2 along the arranging direction of the cylinders, each intercooler 63 is connected with three pieces of low-pressure stage superchargers 52, and the three pieces of the low-pressure stage superchargers 52 are connected to the three pieces of cylinders in the right bank and the six pieces of cylinders in the left bank, which cylinders are arranged near the associated intercooler 63.

Abstract: A air supplying structure for multi-cylinder engine comprising six pieces of high-pressure stage superchargers 51, six pieces of low-pressure stage superchargers 52, two pieces of inter coolers 63 arranged between the high-pressure stage and low-pressure stage superchargers, and six pieces of after coolers 62 arranged between the high-pressure stage superchargers and cylinders, in which each high-pressure stage supercharger 51 is connected with three pieces of cylinders, each after cooler 62 is connected with each high-pressure stage supercharger 51, the two pieces of inter coolers 63 are arranged at opposite sides of the engine body 2 along the arranging direction of the cylinders, each inter cooler 63 is connected with three pieces of low-pressure stage superchargers 52, and these three pieces of the low-pressure stage superchargers 52 are connected to those three pieces of cylinders in the right bank and those six pieces of cylinders in the left bank, which cylinders are arranged near the associated inter

Abstract: More than two damping chambers 2A to 2C), a communicating pipe (6) for intercommunicating the damping chambers (2A, 2B) and another communicating pipe (7) for intercommunicating the damping chambers (2B, 2C) are provided. Both ends of the communicating pipes (6, 7) are closed by an end plate (9) and the respective damping chambers (2A to 2C) and inside of the communicating pipes (6, 7) are intercommunicated by communicating holes (8A) on an outer circumference of the communicating pipes (6, 7). Exhaust gas flows from the damping chamber (2A) to communicating holes (8A1), inside of the communicating pipe (6), communicating holes (8A2), the damping chamber (2B), communicating holes (8A3), inside of the communicating pipe (7), communicating holes (8A4), and the damping chamber (2C), thus damping exhaust noise by repeated effective contraction and expansion.