Patent ID: 7856813
Filing Date: 2010-12-28
Classification: F01N,F02B,Y02T

Abstract:
1. An exhaust device of an eight-cylinder engine, comprising first through eighth cylinders ignited in that order, each cylinder having an exhaust port, and an exhaust manifold communicating with the exhaust ports of the first to eighth cylinders, the exhaust manifold comprising first through eighth upstream exhaust pipes extending respectively from the exhaust ports of the first through eighth cylinders, first through fourth midway exhaust pipes extending respectively from a joint of downstream ends of the first and fifth upstream exhaust pipes, a joint of downstream ends of the second and sixth upstream exhaust pipes, a joint of downstream ends of the third and seventh exhaust pipes, and a joint of downstream ends of the fourth and eighth upstream exhaust pipes, and first and second downstream exhaust pipes extending respectively from a joint of downstream ends of the first and third midway exhaust pipes and a joint of downstream ends of the second and fourth midway exhaust pipes for communicating the respective joints to the ambient atmosphere.