The exhaust of a multi-cylinder engine

Japanese Patent JP5910034

B2

An exhaust device includes a plurality of independent exhaust passages connected to an exhaust port of one cylinder or a plurality of cylinders that are non-sequential in exhaust order, and a mixing pipe into which exhaust that has passed through the respective independent exhaust passages flows. The downstream ends of the respective independent exhaust passages are connected in a bundled form to the upstream end of the mixing pipe. A cavity expansion chamber is disposed in an exhaust passage downstream from the mixing pipe. The cavity expansion chamber is disposed in a position (at a distance L2) such that, in the intermediate speed range, a negative pressure wave generated due to an exhaust pressure wave generated by opening an exhaust valve being reflected by the cavity expansion chamber reaches the exhaust port during an overlap period of the exhaust valve and an intake valve of the cylinder.

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Takamasa Matsumoto
Mitsuo Nakamura
Fujii Mikiko
Souaki Nobuhiro
Toshiki Okazaki
Wakabayashi Yoshitsugu

JP2011260600A

April 27, 2016

November 29, 2011

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Mazda Corporation Inc

F02D13/02; F01N5/00; F01N13/02; F01N13/10; F02B27/04

JP3229918A
JP64019118A
JP2005248814A
JP2011214438A
JP2011111932A
JP2000154715A

Etsushi Kotani
Masataka Otani
Ko Sato

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