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The updated sound law 2005 Wisconsin Act 210 was signed into law by Governor Jim Doyle March 27, 2006. This establishes reasonable sound limits for snowmobiles, and a simple stationary test that can be done in the field by law enforcement personnel.
SAE standard test J192 is used as it was previously, to test the overall vehicle noise produced by a snowmobile that is accelerating at full throttle on a flat surface, approximately 50 feet away from the sound meter. The previously existing decibel limits continue to be used.
The new January of 2004 SAE standard test J2567 is used to test the exhaust and engine noise produced by a snowmobile while it is stationary. This test can be performed pretty easily and safely in the field. 1976 and newer snowmobiles have a maximum of 88db, older models have a max. of 90db.
It continues to be against the law to modify a trail used snowmobile in any manner that increases total vehicle noise above that emitted by the snowmobile as originally manufactured, as measured by SAE standard J192
In late 2003, Karl Brooks (former DNR Snowmobile/ ATV Administrator) prepared an early document regarding Stationary Snowmobile Sound Testing. The testing procedure was basically an early draft of the January 2004 SAE Standard J2567. Some of the decibel limits in the document do NOT reflect the current law. It is a Microsoft Word document that can be downloaded LE-40-03 MS Word document.
For those that don't like the virus checking time of an MS Word Document, here it is in
LE-40-03 Adobe .pdf
72k 4 pages
Section 3 describes the J2567 stationary test procedure
Section 4 (6) explains about the DNR right to inspect and test with the cooperation of the operator or owner.
Here is a general summary of the Jan. 2004 SAE J2567 stationary test procedure: The sound meter microphone is placed 4 feet above the ground, inline with the exhaust outlet/center point of multiple exhaust outlets, on the side of the snowmobile toward which the exhaust is directed, 4 meters distance from the snowmobile longitudinal centerline. The operator holds the brake during the test, starts and runs the engine up to normal operating temperature, then slowly opens the throttle until a steady 3,750 to 4,000 rpm is achieved for not less than 4 seconds. The test shall be repeated immediately and then the two readings averaged.
You can see this law's passage by checking the History and status of AB-566.
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