Abstract: A muffler for large high r.p.m. internal combustion diesel engine in which the structure cancels sound waves by interference. The gases generally flow in one direction through the muffler with intermittant flow reversal occurring only upon acceleration. The muffler is formed with a plurality of longitudinal chambers divided by reflection walls. Edge echo openings in the reflection wall permit limited gas entry into the chambers. A plurality of helical members surrounded by a large open tube and pierced by a small open tube channel a substantial portion of all of the gases through a bulkhead wall which divides the muffler housing into two large open chambers and a smaller percentage of gases flows through one or more large open tubes.

Abstract: A muffler for large internal combustion diesel engines in which the structure cancels sound waves by interference. The gases generally flow in one direction through the muffler with intermittant flow reversal occurring only upon acceleration. The muffler is formed with a plurality of longitudinal chambers divided by reflection walls. Edge echo openings in the reflection walls permit limited gas entry into the chambers. A plurality of helical members surrounded by a large open tube and pierced by a small open tube channel all of the gases through a bulkhead wall which divides the muffler housing into two volumetrically generally equal portions. The chambers on either side of the tube and helical member cluster are substantially longer than the tubes joined by the helix members.

Abstract: A muffler for internal combustion engines in which the structure cancels sound waves by interference. The gases generally flow in one direction through the muffler with intermittant flow reversal occurring only upon acceleration. The muffler is formed with a plurality of longitudinal chambers divided by reflection walls. Edge echo openings in the reflection walls permit limited gas entry into the chambers. A plurality of helical members surrounded by a large open tube and pierced by a small open tube channel all of the gases through a bulkhead wall which divides the muffler housing into two volumetrically generally equal portions.

Abstract: A muffler for automobile internal combustion engines consisting briefly of a housing having an inlet end where the exhaust gases are channeled through a tubular member having a helical member so that the gases are forced into a spiral flow pattern. The helical member extends beyond the end of the tubular member so that the gases are then permitted to follow a larger spiral pattern where they reflect against the walls of the housing. The housing has an outlet opening which is smaller than the housing diameter which causes compression of the gases and further reflection and interference of the sound waves. The muffler is formed with a counterflow reverberation chamber, a central chamber and a directional-flow reverberation chamber.