Abstract: An improved muffler and energy saving device for diesel engines comprising a housing having an inlet passageway for admitting gases into the interior of the housing and an outlet passageway for discharging gases from the housing, an alcove, near the entrance of the housing, to capture unburned components from the exhaust stream which are returned to the air induction manifold of the engine. Baffles disposed within the housing break up the exhaust pulses to reduce sound emission while permitting the free flow of exhaust gases between the inlet and outlet ports of the muffler. The muffler creates negligible internal back pressure due to the large passageways provided and is therefore not subject to the problems associated with plugging or clogging.

Abstract: A muffler for internal combustion engines and comprising a housing having an inlet passageway for admitting exhaust gases into the interior of the housing and an outlet passageway for discharging the exhaust gases from the housing, the interior of the housing providing a fluid passageway having a cross-sectional area greater than the cross-sectional area of the inlet and outlet passageways for reducing back pressure as the gases move through the muffler, baffles disposed within the housing and in the fluid passageway for providing a tortuous path of travel for the gases moving between the inlet and outlet passageways to increase the length of the travel of the gases through the muffler and to provide alcoves or pockets in the interior of the housing for cushioning the flow of the gases therethrough in order to equalize the pressure within the muffler, and a passageway providing communication between the interior of the housing and the combustion chamber of the engine for directing a portion of the hot exhaust