Patent ID: 6349541
Filing Date: 2002-02-26
Classification: F01N,F02B

Abstract:
An internal combustion engine having a two stroke mode or a four stroke mode selective capacity, to operate in more than one stroke modes, and including an electronic control unit which has operational characteristic maps for load, engine speed, and stoke modes, an improved exhaust gas silencer apparatus having variable operational characteristics conforming to different stroke modes of the associated engine, the improved silencer comprising:a silencer enclosure having an apertured wall member separating the interior into first and second volumetric chambers; said silencer enclosure having an inlet to said first chamber for receiving exhaust gas from the engine and an outlet from said first chamber for discharging exhaust gas; and a valve member normally covering said aperture in said wall member when the associated engine is operated in a first stroke mode and with the valve member being selectively, movable to open said aperture in said wall member when the associated engine is operated in a second stroke mode.