Tuned exhaust system for small engines
AssigneeTecumseh Products Company
InventorsDavid R. Brower, John R. Mason
Life of this patent
Estimating the term…
Abstract
A tuned exhaust system for small two cylinder engines, the exhaust system including a pair of exhaust passage through which exhaust gasses pass. The exhaust passages are dimensioned to providing a tuning effect to the exhaust gasses for enhanced engine performance. The exhaust passages are not straight and elongated, but rather are sprialed, scrolled, coiled, or otherwise folded upon themselves at least twice. In this manner, the exhaust passages may be housed at least in part within a muffler having a significantly reduced overall size or profile, such that the muffler may be used in small engines.
Claims13
A muffler for a two cylinder internal combustion engine, comprising:
- a housing having two muffler inlets respectively connected to the engine cylinders, and at least one muffler outlet;
- two exhaust passages disposed within said housing, one associated with each inlet, said exhaust passages each folded upon themselves at least twice and shaped to provide an exhaust tuning effect to increase the output power of the engine, each said exhaust passage shaped as a spiral, including an exhaust passage inlet communicating with a respective said muffler inlet, and an exhaust passage outlet communicating with a respective said muffler outlet;
- and
- a pair of tubes disposed within said muffler housing around which said spiral exhaust passages are respectively disposed, said exhaust passage outlets in communication with a respective said tube, each tube in communication with a muffler outlet.
A muffler for a two cylinder internal combustion engine, comprising:
- a muffler housing having two inlets in respective communication with the engine cylinders and at least one muffler outlet;
- two exhaust passages disposed within said muffler housing, each said exhaust passage folded upon itself at least twice, said exhaust passages in respective communication with said inlets and in communication with said at least one outlet, wherein said muffler includes a pair of housing halves connected to one another with a dividing wall therebetween, with one each of said muffler inlet, exhaust passage, and muffler outlet disposed on each side of said dividing wall.
A muffler for a two cylinder internal combustion engine, comprising:
- a muffler housing having two inlets in respective communication with the engine cylinders and at least one muffler outlet;
- two exhaust passages disposed within said muffler housing, each said exhaust passage folded upon itself at least twice, said exhaust passages in respective communication with said inlets and in communication with said at least one outlet wherein said exhaust passages each have a spiral share disposed about a central axis, including an exhaust passage inlet in communication with a respective said muffler inlet and an exhaust passage outlet in communication with said at least one muffler outlet;
- and
- a pair of tubes disposed centrally within said muffler housing along said central axis of said exhaust passages and around which said spiral exhaust passages are respectively disposed, said exhaust passage outlets in communication with a respective said tube, each tube in communication with a muffler outlet.
Dependencies are inferred from the claim text.