Patent ID: 7156202
Filing Date: 2007-01-02
Classification: F01N

Abstract:
1. A muffler for coupling to an exhaust port of an internal combustion engine, said muffler comprising a housing forming at least one internal expansion chamber configured to receive exhaust gas from said engine and directing the exhaust gas to an exhaust outlet, the muffler having a trap chamber, a restricted throat having a cross-sectional area smaller than a cross-sectional area of the trap chamber and positioned downstream from the trap chamber such that the exhaust gas flows into the trap chamber and then out of the trap chamber through the restricted throat, and an ejector portion downstream from the restricted throat, the ejector portion being configured to draw in ambient air through an air inlet to cool the exhaust gas as the exhaust gas passes through the exhaust outlet, wherein the restricted throat increases the velocity of the exhaust gas as it enters the ejector portion so as to aid in drawing in ambient air.