Patent ID: 8469142
Filing Date: 2013-06-25
Classification: F01N

Abstract:
1. A muffler assembly for exhaust gas flow communication with an engine exhaust, the assembly comprising: a muffler having inlet and outlet ports located at opposite ends of the engine exhaust, first and second flow passages in common fluid communication with the outlet port and in variable fluid communication with the inlet port, the first and second flow passages meeting at first and second connecting points, the first connecting point being located in the proximity of the inlet port at one end of the muffler, the second connecting point being located in the proximity of the outlet port at a distal end of the muffler, the first flow passage having a higher resistance to fluid flow than the second flow passage; and a valve means generally located past the first connecting point inside the second flow passage for selectively proportionating exhaust gases passing through the passages, the first flow passage including three or more conduits, wherein the three or more conduits are in series fluid communication with each other and no portion of any one of the three or more conduits is contained within any of the remaining conduits.