Tag Archives: SAE J2825

Sound – Winter 2014 Update

FAQs

1. What are the road side or trail side sound test procedures?

The sound test procedure for Motorcycles, ATV’s, ROV’s and  MUVs is SAE J1287. This is a stationary testing method where the measurement is taken close to the vehicle.

This procedure is outlined in numerous vehicle operational codes and in sporting regulations.

SoundFAQ1a SoundFAQ1b

On Highway Motorcycles and Dual Sport Motorcycles – These vehicles are becoming very popular. The testing procedure for these on highway legal vehicles is covered in the SAE Test procedure, SAE J1287.

On Highway Motorcycles “Street Bikes”  – Be advised that an SAE test procedure has been developed specifically for On-Highway motorcycles. The test procedure is SAE J2825.
(Technical report issued, summary available upon request) (Video: http://www.youtube.com/watch?v=2KdYUhH3JSo)

SoundFAQ1c P100117 v118-6 PassCar-MS.indd

2.  Are new designs of vehicles required to be noise compliant?

SoundFAQ2a SoundFAQ2b

Yes, Side by Side ATV’s also known as ROV’s  “Recreational Off Highway Vehicles” / MUVs “Multi Use Vehicles” are becoming very popular.

These vehicles are subject to the same noise and spark arrester regulations as other OHV’s and the test procedures and sound limits apply.

 It is possible that these Off-Highway vehicles may have On Highway / limited street use privileges in some communities, therefore, noise control levels for street registered vehicles apply.    (Video Available)

Other Street / On Highway registered vehicles such as Jeeps and Sand Rails and Hot Rods must conform to noise control and adequate muffler requirements.

Refer to the appropriate vehicle code sections.  The sound measurement test procedures are published by the SAE.

For California and many other states and sections of Canada the common automotive roadside sound test methods for automobiles are SAE J1169 or SAE 1492, or the ISO counterpart.  This is a 20” test method and is very similar to the sound testing methods utilized for Off Highway Motorcycles and ATVs / MUVs. (Video available)

SoundFAQ2c SoundFAQ2d

 3. Are Mufflers and a Spark Arresters the same thing?

SoundFAQ3a SoundFAQ3b

No, Off Highway Vehicle exhaust systems have several components.  First is the Muffler. The muffler is for reducing the sound level.

The second component is often a Spark Arrester.

The Spark arrester is intended to minimize the potential for discharging particulates that can be an ignition source.  These are individual components often.  Each component requires maintenance to function properly.

4. What are the sound measuring equipment requirements?

For Enforcement purposes, an ANSI Type 1 instrument is needed.  The “evidence level” instruments require calibration to be utilized for evidence gathering purposes.   When selecting instruments, be sure to consider the required performance level and calibration maintenance costs.  The evidence equipment calibration term is yearly.

For Awareness measuring purposes, an ANSI Type 2 instrument is suitable.  These instruments are frequently utilized by trail volunteers and clubs.  These instruments when calibrated and used by trained personnel provide reasonably accurate data.  These instruments have a recommended calibration term of every other year.

5. Are sound measuring equipment programs available?

Yes, several equipment programs are available, ranging from equipment accuracy verification programs (Calibration) and “loaner” equipment kits for special events.

Complete sound measuring instrument kits are available for purchase.

 6. How do you get more information or training?

Instruction and training for noise control is available.  DPS Technical coordinates these training sessions.  Currently a schedule of live on location classes is being developed for the season.

A web based training module is available as well as several field training refresher and outreach sessions.

In the event your agency needs people trained please send an e-mail to us and we will send you the training schedule.

 

It is my hope that this information is beneficial. In the event you require more information, please do not hesitate to contact me directly.

Respectfully,

Chris F. Real, CLS
President, DPS Technical, Inc.
Chris.Real@DPSTechnical.com

 

 

 

 

Resources

American Motorcyclist Association

American Motorcyclist Magazine

Arizona Roddin’ and Ridin’

Auto Week Magazine

ATV

Cycle Magazine

Cycle News

Dealer News

Dirt Bike Magazine

Dirt Rider Magazine

Dirt Wheels Magazine

DPS Technical, Inc.

EPA

Honda

Honda Red Rider

Motorcycle Consumer News

Racer X Illustrated

SAE

Side x Side Action Magazine

Sound

Torco Oil

U.S. Department of Justice

  • DOJ Press Release (03/27/2006) – United States vs. Andrew Wright, re: importation and sale of grey market motorcycles into the United States under false pretenses.

Sound Measuring Equipment

DPS Technical supports responsible OHV recreation and believes that excessive sound levels are a main cause of complaints against the sport.

Since 2004 DPS Technical, Inc. has supplied equipment and training for hundreds of OHV law enforcement officers and civilians throughout North America and these dedicated individuals perform sound level tests when possible.

A need for more citizen involvement in voluntary OHV testing has been identified. To remedy the lack of equipment for citizens to provide voluntary OHV sound level testing, DPS is implementing a Sound Testing Equipment Kit Program.  The testing kit includes a Calibrated Type ll sound meter, tachometer, tape measure, storage box and other items necessary to perform spark arrestor inspections, or the SAE 1287 OHV field sound test or the SAE 2825 On Highway Motorcycle sound test procedure.

For further information on the program or to apply contact DPS Technical, Inc. – Chris Real at (909) 981-5228.

DPS Technical also has sound measurement training classes for civilians and law enforcement personnel. Many of the classes are held under contract and sponsored by The State of California OHV Division. To receive information on our training schedule in your area contact DPS Technical for details.

Chris Real, CLS   President
DPS Technical, Inc.
1160 Dewey Way, Suite D
Upland, CA 91786
(909) 981-5228 T

Development of the J2835 On-Highway Motorcycle Sound Test Procedure

motorcycle-industry-council-logo1The MIC, MIC consultant Tom Austin (Sierra Research), MIC member Chris Real (DPS Technical, Inc.), and SAE Motorcycle Technical Steering Committee Chairman John Lenkeit (Dynamic Research Inc.) co-authored a paper on the development of the SAE J2825 on-highway stationary sound test procedure. The SAE published the paper, which was presented at the 2011 SAE Noise and Vibration Conference in Grand Rapids, Michigan on May 17th. The 14-page paper details the field testing, data analysis, evaluation of test site conditions, validation testing and even field testing.

In response to a growing need for a practical and technically valid method for measuring exhaust sound pressure levels (SPL) of on-highway motorcycles, the SAE Motorcycle Technical Steering Committee has developed Surface Vehicle Recommended Practice J28251, “Measurement of Exhaust Sound Pressure Levels of Stationary On-Highway Motorcycles,” which includes a new stationary sound test procedure and recommendations for limit values. Key goals of the development process included: minimal equipment requirements, ease of implementation by non-technical personnel, and consistency with the federal EPA requirements; in particular, vehicles compliant with the EPA requirements should not fail when assessed using J2825. Development of the recommended practice involved a comprehensive field study of 25 motorcycles and 76 different exhaust systems, ranging from relatively quiet OEM systems to unbaffled, aftermarket exhaust systems. For the various motorcycle/exhaust system configurations, SPL measurements were made using the EPA pass-by procedure and several different stationary measurement methods.

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