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in automobiles, device designed to reduce the noise from the exhaust of an internal-combustion engine. When the exhaust gases from an internal-combustion engine are released directly into the atmosphere, they create a loud noise, caused by the passage of the exhaust gases from the high pressure of the cylinder to the normal pressure of the atmosphere. To eliminate or tone down the noise, the gases are led through a pipe to a muffler. Typically a muffler consists of a tubular metal jacket containing perforated pipes and chambers through which the exhaust gases flow before entering the atmosphere. The pipes and chambers are arranged so that the noise from the exhaust gases is reflected back toward the engine or back and forth among the chambers, reducing greatly the amount of noise that is radiated into the environment.


A device to deaden the noise produced by escaping gases or vapors.

sound attenuator

In ductwork, a device (usually prefabricated) especially designed to provide much greater sound attenuation than would be provided by an equal length of ductwork; the pressure drop through the device is greater than for an equal length of ductwork.


US and Canadian any device designed to reduce noise, esp the tubular device containing baffle plates in the exhaust system of a motor vehicle
References in periodicals archive ?
This bill seeks to regulate the use of mufflers, those that are missing, defective, and their modifications that increase the sound emitted by a motor vehicle, contributing to noise pollution, penalizing owners and drivers that contribute to the sound that exacerbate noise pollution to our environment,' said Gatchalian in his bill.
During a scheduled inspection, the right engine's rear muffler was discovered to be separated internally.
Lai and Soedel (1996a, 1996b, 1996c, 1996d) applied the same approach to analyze 2D mufflers with uniform and non-uniform thicknesses and the gas pulsations in such mufflers.
Razorback Muffler officials asked Razorback Exhaust to stop using the name and logo, but Razorback Exhaust owner Jason Fields continued, according to the lawsuit Razorback Muffler filed April 11 in Pulaski County Circuit Court.
The mufflers, produced between June and November 2003, have defective metal components that fit to the chassis of vehicles, Toyota Technocraft said.
Although Missouri does not have environmental regulations dealing with waste mufflers or catalytic converters specifically, they must be handled so they do not become an environmental or public health hazard.
Some 20 million mufflers have been produced using the Silentex sound dampening system in 2003 and if the cascading switch to absorptive muffler designs continues, there will surely be many more to come.
The mufflers connect directly with the purifier bodies by means of quick-release clamps.
The mufflers were carefully designed and painted with acrylic paints and sealed with a protective finish to protect them from the weather.
Not through law enforcement or by sponsoring a ban on loud music systems, but by installing quality mufflers on automobiles in this small coastal community.
Welding-wire solution for an underwater muffler A design change in the Kawasaki Jet Ski watercraft has made the water mufflers on these sport vehicles quieter and last longer.
The mufflers in this standard line offer a low-cost, high-performance, alternative to custom designed OEM mufflers to maximize value to the customer.