Patent ID: 7171804
Filing Date: 2007-02-06
Classification: F01N,F02B,F02D,F02M,Y02T

Abstract:
1. An exhaust system for a multi-cylinder engine having a plurality of exhaust pipes with first ends connected to exhaust openings of a multi-cylinder engine, and a collecting pipe connected to second ends of the exhaust pipes for collecting exhaust introduced from the exhaust pipes and directing it to a silencer, the collecting pipe having: a front-end portion communicating to at least four exhaust passages of the exhaust pipes; a middle portion configured to merge the at least four exhaust passages into at least two merged exhaust passages and to collect exhaust introduced from the front-end portion; and a rear-end portion for further collecting the exhaust introduced from the middle portion, the middle portion being provided with an exhaust control module for controlling the area of the at least two merged exhaust passages in accordance with engine conditions.