Importance

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Abstract

An exhausting apparatus for a four-cycle four-cylinder engine having four cylinders each provided with an exhaust port comprises four exhaust pipes connected to corresponding exhaust ports of the engine cylinders. The four exhaust pipes are classified into first and second groups in accordance with ignition timings and the first and second groups of two exhaust pipes each are shifted in connection with the ignition timings by means of an angle of 360.degree. with respect to each other. Exhaust chamber members including two exhaust chambers each, are in communication with front portions of the exhaust pipes respectively through means of communication holes and two communication pipes, one connecting the first group of the exhaust pipes and the other connecting the second group of the exhaust pipes. The downstream ends of the exhaust pipes are connected to a collecting cylinder having its interior separated by means of a separator into two sections into which the first and second groups of the exhaust pipes are arranged, respectively. A collecting exhaust pipe is connected to a downstream end of the collecting cylinder member and a muffler is mounted upon the collecting exhaust pipe.

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First Claim