Regulation No. 92-01

Name:Regulation No. 92-01
Description:Exhaust Silencer Replacement Systems (NORESS) - Motorcycles.
Official Title:Uniform Provisions Concerning the Approval of: Non-original Replacement Exhaust Silencing Systems (NORESS) for Vehicles of Categories L1, L2, L3, L4 and L5 with Regards to Sound Emission.
Country:ECE - United Nations
Date of Issue:2012-12-05
Amendment Level:01 Series, Supplement 2
Number of Pages:22
Vehicle Types:Component, Motorcycle
Subject Categories:Emissions and Fuel Consumption, Noise
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Keywords:

approval, regulation, vehicle, type, noress, sound, silencing, system, amendments, manufacturer, exhaust, paragraph, requirements, series, components, number, test, replacement, date, gear, engine, speed, component, annex, force, granted, level, emission, approved, non-original, entry, vehicles, accordance, thereof, systems, mark, production, representative, supplement, extension, provisions, means, tests, maximum, fitted, fibrous, power, average, position, model

Text Extract:

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E/ECE/324
) Rev.1/Add.91/Rev.1/Amend.2
E/ECE/TRANS/505 )
December 7, 2017
STATUS OF UNITED NATIONS REGULATION
ECE 92-01
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
NON-ORIGINAL REPLACEMENT EXHAUST SILENCING SYSTEMS (NORESS) FOR
VEHICLES OF CATEGORIES L , L , L , L AND L WITH REGARDS TO SOUND EMISSION
Incorporating:
00 series of amendments
Date of Entry into Force: 01.11.93
Supplement 1 to the 00 series of amendments
Date of Entry into Force: 07.02.99
Supplement 2 to the 00 series of amendments
Date of Entry into Force: 09.11.05
Corr. 1 to Supplement 2 to the 00 series of amendments
Dated: 07.04.06
Supplement 3 to the 00 series of amendments
Date of Entry into Force: 10.10.06
01 series of amendments
Date of Entry into Force: 18.11.12
Supplement 1 to the 01 series of amendments
Date of Entry into Force: 09.02.17
Supplement 2 to the 01 series of amendments
Date of Entry into Force: 10.10.17

REGULATION NO. 92-01
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF
NON-ORIGINAL REPLACEMENT EXHAUST SILENCING SYSTEMS (NORESS) FOR
VEHICLES OF CATEGORIES L , L , L , L AND L WITH REGARDS TO SOUND EMISSION
CONTENTS
1.
Scope
2.
Definitions
3.
Application for Approval
4.
Markings
5.
Approval
6.
Specifications
7.
Modification and extension of the Approval of NORESS and Extension of Approval
8.
Conformity of Production
9.
Penalties for Non-conformity of Production
10.
Production Definitively Discontinued
11.
Names and Addresses of Technical Services Responsible for Conducting Approval Tests and of
Type Approval Authorities
ANNEXES
Annex 1
Annex 2
Annex 3
Annex 4
– Communication
– Examples of the approval mark
– Requirements for fibrous absorbent materials used in NORESS
– Statement of Compliance with the Additional Sound Emission Provisions

2.6. "Vehicle type" means vehicles, falling under the scope of this Regulation, which do not differ
in such essential respects as:
(a)
(b)
(c)
The type of engine (two-stroke of four-stroke with reciprocating or rotary pistons;
number and capacity of cylinders; number and type of carburettors or injection
systems; arrangement of valves; maximum net power and corresponding engine
speed). For rotary piston engines, the cubic capacity should be taken to be double of
the volume of the chamber;
Drive train, in particular the number and ratios of the gears of the transmission and the
final ratio;
Number, type and arrangement of exhaust silencing systems.
2.7. "Rated engine speed" means the engine speed at which the engine develops its rated
maximum net power as stated by the manufacturer.
The symbol n denotes the numerical value of the rated engine speed expressed in
revolutions per minute.
3. APPLICATION FOR APPROVAL
3.1. The application for approval of a NORESS or components thereof shall be submitted by its
manufacturer or by his duly accredited representative.
3.2. It shall be accompanied by the under mentioned documents in triplicate and the following
particulars:
(a)
(b)
(c)
A description of the vehicle type(s) on which the NORESS or components are intended
to be fitted, with regard to the items referred to in Paragraph 2.6. above. The numbers
and/or symbols identifying the engine type and the vehicle type shall be specified and
the vehicle type approval number, if necessary;
A description of the complete NORESS showing the relative position of each of its
components, together with instructions for their assembly;
Detailed drawings of each NORESS component to enable it to be easily located and
identified, and specification of the materials used. These drawings shall also indicate
the location for the mandatory affixing of the approval number.

4.6. The manufacturer shall provide:
(a)
(b)
(c)
Instructions explaining in detail the correct method of mounting on the vehicle,
Instructions for handling the silencing system,
A list of components with the numbers of the corresponding parts, excluding retainers.
4.7. The approval mark.
5. APPROVAL
5.1. If the NORESS or component thereof submitted for approval under this Regulation meets the
requirements of Paragraph 6. below, approval for that type shall be granted.
5.2. An approval number shall be assigned to each NORESS type approved. Its first two digits (at
present 01 corresponding to the 01 series of amendments to the Regulation) shall indicate the
series of amendments incorporating the most recent major technical amendments made to
the Regulation at the time of issue of the approval. The same Contracting Party may not
assign the same number to another type of NORESS or component designed for, the same
type(s) of vehicle.
5.3. Notice of approval or extension or refusal of approval of a NORESS or component thereof
under this Regulation shall be communicated to the Parties to the Agreement which apply this
Regulation, by means of a form conforming to the model in Annex l to this Regulation.
5.4. There shall be affixed to every NORESS and component thereof conforming to a type
approved under this Regulation an international approval mark consisting of:
(a)
(b)
(c)
A circle surrounding the Letter "E" followed by the distinguishing number of the country
which has granted approval;
The number of this Regulation, followed by the Letter "R", a dash and the approval
number to the right of the circle prescribed in (a) above;
The approval number shall be indicated in the approval form, together with the method
used for the approval tests.
5.5. The approval mark shall be easily legible when the NORESS is fitted to the vehicle, and shall
be indelible.
5.6. A component may be marked with more than one approval number if it has been approved as
a part of more than one NORESS; in this case the circle need not be repeated. Annex 2 to
this Regulation gives an example of the approval mark.

6.3.2. Multi-mode NORESS
NORESS with multiple, manually or electronically adjustable, rider selectable operating
modes shall meet all requirements in all operating modes. The reported sound levels shall be
those resulting from the mode with the highest sound levels.
6.3.3. Prohibition of Defeat Devices
The NORESS manufacturer shall not intentionally alter, adjust or introduce any device or
procedure solely for the purpose of fulfilling the sound emission requirements of this
Regulation, which will not be operational during typical on-road operation.
6.3.4. Additional Sound Emission Provisions (ASEP)
The requirements of Paragraph 6.3. of the 04 series of amendments to UN Regulation No. 41
shall also be fulfilled for the NORESS, if it is designed to be used on vehicles that are type
approved according to the 04 series of amendments to UN Regulation No. 41 and are subject to
the requirements of Paragraph 6.3. of the 04 series of amendments to UN Regulation No. 41.
If tests are to be performed, the vehicle as described in Paragraph 3.3. (c) shall be used.
The Type Approval Authority may require any relevant test to verify the compliance of the
NORESS to these requirements.
The manufacturer shall provide a statement in conformity with Annex 4 of this Regulation, that
the NORESS or components to be approved comply with the additional sound emission
provision requirements of Paragraph 6.3. of the 04 series of amendments to UN Regulation
No. 41.
6.4. Measurement of Vehicle Performance
6.4.1. The NORESS or its components shall be such as to ensure that the vehicle's performance is
comparable with that achieved with the original exhaust silencing system or components
thereof.
6.4.2. The NORESS or, at the manufacturer's choice, the components thereof shall be compared
with an original silencing system or components, also in new condition, successively fitted to
the motorcycle, moped or three-wheeled vehicle referred to in Paragraph 3.3. (c).
6.4.3. The verification shall be carried out by measuring the output curve in accordance with
Paragraph 6.4.4.1. or 6.4.4.2. The maximum power and the engine speed at maximum power
measured with the NORESS shall not exceed the net power and the speed measured under
the conditions set out below with the original equipment exhaust system by more than ± 5%.

7. MODIFICATION AND EXTENSION OF THE APPROVAL OF NORESS AND EXTENSION
OF APPROVAL
7.1. Every modification of the type of NORESS or its components shall be notified to the Type
Approval Authority which approved the type of NORESS. The said Authority may then either:
(a)
(b)
Consider that the modifications made are unlikely to have an appreciable adverse
effect, or
Require a further test report from the Technical Service responsible for conducting the
tests.
7.2. The manufacturer of the NORESS or component thereof or his duly accredited representative
may ask the Type Approval Authority which has granted the approval of the NORESS for one
or several types of vehicle for an extension of the approval to other types of vehicle. The
procedure shall be as described in Paragraph 3 above.
7.3. Confirmation or refusal of approval, specifying the modifications, shall be communicated in
accordance with the procedure specified in Paragraph 5.3. above to the Contracting Parties to
the Agreement applying this Regulation.
7.4. The competent authority issuing the extension of approval shall assign a series number to
each communication form drawn up for such an extension.
8. CONFORMITY OF PRODUCTION
The conformity of production procedures shall comply with those set out in the Agreement,
Appendix 2 (E/ECE/324-E/ECE/TRANS/505/Rev.2), with the following requirements:
(a)
(b)
(c)
(d)
The NORESS approved to this Regulation shall be so manufactured as to conform to
the type approved by meeting the requirements set out in Paragraph 6. above;
The holder of the approval shall ensure that for each type of NORESS at least the tests
prescribed in Paragraph 6 of this Regulation are carried out;
The authority which has granted type approval may at any time verify the conformity
control methods applied in each production facility. The normal frequency of these
verifications shall be once every two years;
The production is considered to conform to the requirements of this Regulation, if the
provisions of UN Regulation Nos. 9, 41 and 63, corresponding to the type of vehicle,
are complied with and if the sound level measured by the method described in the
given Regulations during the test in motion does not exceed by more than 3dB(A) the
sound level measured during the type approval and does not exceed by more than
1dB(A) the limits prescribed in UN Regulation Nos. 9, 41 and 63 as applicable.

ANNEX 1
PART A. FOR NORESS FOR VEHICLE TYPES APPROVED ACCORDING
TO THE 04 SERIES OF AMENDMENTS TO UN REGULATION NO. 41
COMMUNICATION
(Maximum format: A4 (210 × 297mm))
issued by:
Name of administration:
.....................................
.....................................
.....................................
concerning:
APPROVAL GRANTED
APPROVAL EXTENDED
APPROVAL REFUSED
APPROVAL WITHDRAWN
PRODUCTION DEFINITIVELY DISCONTINUED
of a vehicle type with regard to a type of NORESS or component thereof pursuant to UN Regulation No. 92
Approval No ...................................................... Extension No ...................................................
1. Trade name or mark of the vehicle: ...............................................................................................
2. Vehicle type: ...................................................................................................................................
3. Manufacturer's name and address: ................................................................................................
4. If applicable, name and address of manufacturer's representative: ..............................................
5. Engine
5.1. Manufacturer: .................................................................................................................................
5.2. Type: ..............................................................................................................................................
5.3. Model: .............................................................................................................................................
5.4. Rated maximum net power: ................................. kW at ..................................................... min
5.5. Kind of engine (e.g. positive-ignition, compression ignition, etc.) : ..............................................
5.6. Cycles: two-stroke/four-stroke

13. Vehicle speeds of measurements in gear (i)
13.1. Vehicle speed at the beginning of the period of acceleration (average of 3 runs) for gear (i):
............................................................................................................................................... km/h
13.2. Pre-acceleration length for gear (i): ........................................................................................... m
13.3. Vehicle speed v (average of 3 runs) for gear (i): ............................................................... km/h
13.4. Vehicle speed v (average of 3 runs) for gear (i): ............................................................... km/h
14. Vehicle speeds of measurements in gear (i+1) (if applicable)
14.1. Vehicle speed at the beginning of the period of acceleration (average of 3 runs) for gear (i+1):
............................................................................................................................................... km/h
14.2. Pre-acceleration length for gear (i+1): ....................................................................................... m
14.3. Vehicle speed v (average of 3 runs) for gear (i+1): ........................................................... km/h
14.4. Vehicle speed v (average of 3 runs) for gear (i+1): ........................................................... km/h
15. Accelerations are calculated between Lines AA' and BB'/PP' and BB'
15.1. Description of functionality of devices used to stabilize the acceleration (if applicable): ...............
16. Sound levels of moving vehicle
16.1. Wide-open-throttle test result L : ....................................................................................... db(A)
16.2. Constant speed test results L : .......................................................................................... db(A)
16.3. Partial power factor k : ......................................................................................................... db(A)
16.4. Final test result L : ........................................................................................................... db(A)
17. Sound level of stationary vehicle
17.1. Position and orientation of microphone (according to Appendix 2 of Annex 3 of 04 series of
UN Regulation No. 41): ..................................................................................................................
17.2. Test result for stationary test: ............................... db(A) at ................................................. min
18. Additional sound emission provisions:
See manufacturer's statement of compliance (attached)

PART B. FOR NORESS FOR VEHICLE TYPES APPROVED ACCORDING
TO UN REGULATION NO. 9 OR UN REGULATION NO. 63
COMMUNICATION
(Maximum format: A4 (210 × 297mm))
Issued by:
Name of administration
.....................................
.....................................
.....................................
concerning:
APPROVAL GRANTED
APPROVAL EXTENDED
APPROVAL REFUSED
APPROVAL WITHDRAWN
PRODUCTION DEFINITELY DISCONTINUED
of a vehicle type with regard to a type of NORESS or component there of pursuant to UN Regulation No. 92.
Approval No. ................................... Extension No. ...........................................
1. Trade name or mark of the vehicle: ...............................................................................................
2. Vehicle type: ...................................................................................................................................
3. Manufacturer's name and address: ................................................................................................
4. If applicable, name and address of manufacturer’s representative: ..............................................
5. Engine
5.1. Manufacturer: .................................................................................................................................
5.2. Type:
5.3. Model: .............................................................................................................................................
5.4. Rated maximum net power: ....................................... kW at ................................................ min
5.5. Kind of engine (e.g. positive-ignition, compression ignition, etc.): ..............................................

12. Vehicle length: ............................................................................................................................ m
13. Sound level of the vehicle in motion: ................................................................................... dB(A)
13.1. Gear (i) for the test of the vehicle in motion: ..................................................................................
13.2. Vehicle speed at the beginning of the period of acceleration (average of three runs) for
gear (i): .................................................................................................................................. km/h
14. Sound level of the stationary vehicle: .................................................................................. dB(A)
14.1. at engine speed: .................................................................................................................... min
14.2. Position and orientation of microphone: .........................................................................................
15. In-use compliance reference data
15.1. Gear (i) or, for vehicles tested with non-locked gear ratios, the position of the gear selector
chosen for the test: .........................................................................................................................
15.2. Vehicle speed at the beginning of the period of acceleration (average of three runs) for
gear (i): .................................................................................................................................. km/h
15.3. Sound pressure level L : ..................................................................................................... dB(A)
16. Date of submission of vehicle for approval: ...................................................................................
17. Technical Service performing the approval tests: ..........................................................................
18. Date of report issued by that Service: ............................................................................................
19. Number of report issued by that Service: .......................................................................................
20. Approval granted/extended/refused/withdrawn: ..........................................................................
21. Position of approval mark on the vehicle: ......................................................................................
22. Place: .............................................................................................................................................
23. Date:
24. Signature: .......................................................................................................................................
25. The following documents, bearing the approval number shown above, are annexed to this
communication:
Drawings, diagrams and plans of the engine and of the sound reduction system;
Photographs of the engine and of the exhaust or silencing system;
List of components, duly identified constituting the sound reduction system.

ANNEX 3
REQUIREMENTS FOR FIBROUS ABSORBENT MATERIALS USED IN NORESS
(See Paragraph 6.5. of this Regulation)
1. Fibrous absorbent material shall be asbestos-free and may be used in the construction of
silencers only if suitable devices ensure that the fibrous absorbent material is kept in place for
the whole time that the silencer is being used and it meets the requirements of any one of
Sections 2, 3, 4 or 5 according to the manufacturer's choice.
2. After removal of the fibrous material, the sound level shall comply with the requirements of
Paragraph 6.2 of this Regulation.
3. The fibrous absorbent material may not be placed in those parts of the silencer through which
the exhaust gases pass and shall comply with the following requirements:
(a)
(b)
(c)
The material shall be heated at a temperature of 650 ± 5°C for 4h in a furnace without
reduction in average length, diameter or bulk density of the fibre.
After heating at 650 ± 5°C for 1h in a furnace, at least 98% of the material shall be
retained in a sieve of nominal aperture size 250μn complying with ISO Standard 3310/1
when tested in accordance with ISO Standard 2599.
The loss in weight of the material must not exceed 10.5% after soaking for 24h at
90 ± 5°C in a synthetic condensate of the following composition:
(i) 1N hydrobromic acid (HBr) 10ml
(ii) 1N sulphuric acid (H SO ) 10ml
(iii) Distilled water to make up to 1,000ml
Note: The material shall be washed in distilled water and dried for 1h at 105°C before
weighing.
4. Before the system is tested in accordance with Paragraph 6.2. of this Regulation it shall be
put into a normal state for road use by one of the conditioning methods in accordance with
and as described in Paragraph 5.1.4. of Annex 3 of UN Regulation Nos. 9 or 63 or in
Paragraph 1.3. of Annex 5 of UN Regulation No. 41, whatever is applicable.
5. Exhaust gases are not in contact with fibrous materials and fibrous materials are not under
the influence of pressure variations.

Exhaust Silencer Replacement Systems (NORESS) - Motorcycles.