\n<\/strong><\/p>\n
\n
– Use \u201cWide-Band\u201d style clamps instead of U-Bolt style clamps when installing replacement components. The resulting joint
\nwill be leak-tight and more easily serviceable on future jobs. \u201cWide-Band\u201d clamps provide the user full wrap-around
\ninstallation, no pipe distortion when sealing and minimizes exhaust leaks and eliminates the need for welding.<\/p>\n
– Eliminate the exhaust system as a source of cab noise by isolating pipe and mufflers with \u001fexible hangers and brackets. On
\ninstallations where isolation mounts are not practical, use double wrapped muf\u001fers.<\/p>\n
– Exhaust gases are passed through the muf\u001fer to reduce the noise of engine combustion. At the same time, back pressure
\ncauses exhaust gases to remain in the engine cylinder after the exhaust stroke. And, while a certain amount of backpressure
\nis vital to optimal performance, too much can result in loss of horsepower and excessive engine\/turbocharger operating
\ntemperatures. When this occurs, performance and fuel economy can suffer.<\/p>\n
– Remember to always replace components with like components in the exhaust system. By replacing an exhaust system part
\nwith a like component, you can be assured of the most efficient performance on your engine.<\/p>\n
– Contact our Customer Assistance team for any exhaust queries that you have<\/p>\n
1. Fan Noise \u2013 Excessive fan speed is the biggest noise 2. Air Intake \u2013 Both the type of system and the location of 3. Mechanical Noise \u2013 The engine and drive train are the 4. Tyres \u2013 Many times this is the major noise source at high 5. Exhaust System \u2013 Worn or inadequate exhaust systems 1 . Worn or leaking \u001fexible tubing is a common noise source. 2. The entire exhaust system should be well supported. This 3. The addition of an universal resonator in the system will 4. Change from a single to a dual system. For maximum 5. On horizontal systems, the tail spouts should be pointed 6. On vertical systems, straight stacks will yield lower sound <\/p>\n
\nReducing Noise Levels
\n<\/strong><\/p>\n
\n
\nThere are five major sources that contribute to the noise level of a highway.
\n<\/em><\/p>\n
\nsource in this area. This can be controlled by the use of a
\ntemperature-controlled or thermostatic fan. Other noise
\nconcerns are bent fan blades and broken or missing
\nshrouds.<\/p>\n
\nthe inlet affect the truck noise level. Air inlets that open to
\nthe side are generally noisier than those that do not.<\/p>\n
\nmajor source of the noise. Operating speed, type of engine, and drive train all affect the total noise level. Shielding the
\nexposed areas with acoustic barriers will reduce noise
\nlevels. Generally, any part of the engine or drive train that
\ncan be seen while standing away from the truck will
\ncontribute toward the total vehicle noise level.<\/p>\n
\nspeeds. The condition of the tyres and the tread pattern
\naffect the noise level. At low speeds, this is not a large
\nnoise source.<\/p>\n
\nare the largest and the most frequent contributor to high
\nnoise levels. A visual inspection and repair of leaking
\nconnections or replacement of failed components will
\nnoticeably reduce noise levels. If the noise level is still
\ntoo high, the addition of resonators, packed stacks, or a
\nchange in muf\u001fers is recommended. The muf\u001fer
\napplication and performance section of this catalog will
\ngive you the recommended muf\u001fers for your particular
\nengine and system configuration.<\/p>\n
\nSPECIFIC WAYS TO REDUCE EXHAUST NOISE LEVELS
\n<\/strong><\/p>\n
\nReplace the part if necessary. The service life of \u001fexible
\ntubing can be improved if it is installed in a relaxed
\nposition. Bending, stretching and compressing all reduce
\nlife because they limit the tubing\u2019s ability to \u201cflex\u201d.<\/p>\n
\nwill reduce the noise generated by the exhaust pipes and
\nthe muf\u001fer shell. Care must be taken to isolate engine
\nvibration from the exhaust system and to provide for
\nexpansion when the system is hot.<\/p>\n
\ngenerally reduce the exhaust noise level from 3 to 6 dBA.
\nPacked stacks would reduce the noise level 3 to 4 dBA.
\nBoth items have a minimal effect on engine backpressure.<\/p>\n
\nbene\u001et, special \u201cdual only\u201d mufflers are usually
\nrecommended. Lower system backpressure is generally
\nan additional bene\u001et of dual systems.<\/p>\n
\ntowards the center of the roadway. This reduces the noise
\nre\u001fected off the road surface and perceived by kerbside
\nobservers to be quieter.<\/p>\n
\nlevels than will curved stacks. Straight stacks direct the
\nnoise upward, where curved stacks direct noise towards
\nthe observer<\/p>\n
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