A high performance muffler, e.g., for an internal combustion engine, reduces exhaust or other gas noise while maintaining a low backpressure to prevent engine power loss. A side inlet pipe connects gas to a muffler body. The inlet pipe is flared at its connection to the muffler body to direct flow o
A high performance muffler, e.g., for an internal combustion engine, reduces exhaust or other gas noise while maintaining a low backpressure to prevent engine power loss. A side inlet pipe connects gas to a muffler body. The inlet pipe is flared at its connection to the muffler body to direct flow of the gas through an inlet chamber of the muffler in a spiral path. In an example embodiment, the muffler body includes three chambers separated by panels. An inlet expansion chamber is adjacent to the inlet and includes a first pipe with a perforated portion. An intermediate expansion chamber adjacent to the inlet chamber receives the gas from the first pipe. Four small pipes at the exit end of the intermediate chamber extend into an outlet expansion chamber. The gas in the outlet expansion chamber exits the muffler body by an outlet pipe at the other end of the outlet expansion chamber. The muffler achieves a high sound reduction without increasing backpressure.
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1. A muffler for use in attenuating a sound induced by or associated with discharging gas produced by a machine, comprising:an body having a first axis along its length and including a first partition for defining an inlet chamber, the body having an inlet opening on a side and an outlet opening at
1. A muffler for use in attenuating a sound induced by or associated with discharging gas produced by a machine, comprising:an body having a first axis along its length and including a first partition for defining an inlet chamber, the body having an inlet opening on a side and an outlet opening at one end; an inlet pipe connected at one end to the inlet opening for delivering the gas into the inlet chamber at an angle to the first axis greater than zero degrees; a first pipe extending from the inlet chamber through the first partition into a second chamber, the first pipe including one or more perforations at a first portion of the first pipe in the inlet chamber, wherein the one or more perforations permit gas in the inlet chamber to flow into the first pipe and into the second chamber; a second partition defining the second chamber as an intermediate chamber and separating the intermediate chamber from an outlet chamber that includes the outlet opening, wherein a length of the intermediate chamber is about one half a length of the inlet chamber; and an outlet pipe connected to the outlet opening for discharging muffled gas from the body. 2. The muffler in claim 1, wherein the one end of the inlet pipe connecting to the body is flared.3. The muffler in claim 1, wherein a cross-section of the inlet pipe is square or rectangular.4. The muffler in claim 1, wherein a cross-section of the inlet pipe is circular or elliptical.5. The muffler in claim 1, wherein the muffler body is cylindrically-shaped.6. The muffler in claim 1, wherein a cross-section of the muffler body is elliptical.7. The muffler in claim 1, wherein the muffler is a reactive muffler.8. The muffler in claim 1, wherein the inlet pipe is connected to the inlet opening at an angle substantially greater than zero degrees so that gas delivered by the inlet pipe moves in a spiral type path in the inlet chamber.9. The muffler in claim 8, wherein the inlet pipe is connected to the inlet opening at an angle of 90 degrees.10. The muffler in claim 1, wherein a length of a portion of the first pipe that extends into the intermediate chamber is on the order of about one half the length of the intermediate chamber.11. The muffler in claim 1, further comprising:one or more second pipes extending from the intermediate chamber through the second partition into the outlet chamber. 12. The muffler in claim 11, wherein a length of the intermediate chamber is about one half a length of the inlet chamber and a length of the outlet chamber is less that the length of the intermediate chamber and is based on the length of the inlet chamber.13. The muffler in claim 11, wherein a length of a portion of one or more of second pipes inside the intermediate chamber is about one quarter of the length of the intermediate chamber.14. The muffler in claim 12, wherein a number of second pipes is four.15. The muffler in claim 12, wherein a length of the one or more second pipes is less than a length of the first pipe.16. The muffler in claim 1, wherein the inlet pipe being coupled to the side of the body is configured to attenuate the sound of the gas without increasing back pressure associated with that sound attenuation in a direction opposite to that of the gas flowing in the inlet pipe.17. An exhaust muffler for use in attenuating a sound associated with exhaust gas produced by an internal combustion engine, comprising:an elongated body having a first axis along its length and including a first partition for defining an inlet chamber, the body having an inlet opening on a side and an outlet opening at one end; a side inlet pipe connected at one end to the inlet opening for delivering the exhaust gas into the inlet chamber from the side of the body; a first pipe extending from the inlet chamber through the first partition into a second chamber, the first pipe including a peforated first portion in the inlet chamber, wherein the perforated portion permits exhaust gas in the inlet chamber to flow into the first pipe and into the second chamber; a second partition defining the second chamber as an intermediate chamber and separating the intermediate chamber from an outlet chamber that includes the outlet opening, wherein a length of the intermediate chamber is about one half a length of the inlet chamber; and an outlet pipe connected to the outlet opening for discharging muffled exhaust gas from the body. 18. The muffler in claim 17, wherein the one end of the inlet pipe is flared.19. The muffler in claim 17, wherein a cross-section of the inlet pipe is square or rectangular.20. The muffler in claim 17, wherein a cross-section of the inlet pipe is circular or elliptical.21. The muffler in claim 17, wherein the muffler body is cylindrically-shaped.22. The muffler in claim 17, wherein a cross-section of the muffler body is elliptical.23. The muffler in claim 17, wherein the muffler is a reactive muffler.24. The muffler in claim 17, wherein the inlet pipe is connected to the inlet opening at an angle to the first axis greater than zero degrees so that exhaust gas delivered by the side inlet pipe moves in a spiral type path in the inlet chamber.25. The muffler in claim 24, wherein the inlet pipe is connected to the inlet opening at an angle of at or near 90 degrees.26. The muffler in claim 17, wherein a length of a portion of the first pipe that extends into the intermediate chamber is on the order of about one half the length of the intermediate chamber.27. The muffler in claim 17, further comprising:one or more second pipes extending from the intermediate chamber through the second partition into the outlet chamber. 28. The muffler in claim 27, wherein a length of the intermediate chamber is about one half a length of the inlet chamber and a length of the outlet chamber is less that the length of the intermediate chamber and is based on the length of the inlet chamber.29. The muffler in claim 28, wherein a length of a portion of one or more of second pipes inside the intermediate chamber is about one quarter of the length of the intermediate chamber.30. The muffler in claim 27, wherein a number of second pipes is four.31. The muffler in claim 27, wherein a length of the one or more second pipes is less than a length of the first pipe.32. The muffler in claim 27, wherein the inlet pipe being coupled to the side of the body is configured to attenuate the sound of the exhaust gas without increasing back pressure associated with that sound attenuation to the internal combustion engine.
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