Regulation No. 92-01

Name:Regulation No. 92-01
Description:Exhaust Silencer Replacement Systems - Motorcycles.
Official Title:Uniform Provisions Concerning the Approval of: Non-original Replacement Exhaust Systems (RESS) for Motorcycles, Mopeds and Three-wheeled Vehicles.
Country:ECE - United Nations
Date of Issue:2012-12-05
Amendment Level:01 Series, Supplement 1
Number of Pages:24
Vehicle Types:Component, Motorcycle
Subject Categories:Emissions and Fuel Consumption, Noise
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Keywords:

approval, regulation, type, ress, vehicle, exhaust, motorcycle, test, system, engine, number, silencing, components, paragraph, manufacturer, requirements, speed, conditioning, amendments, series, gear, replacement, component, three-wheeled, load, accordance, fitted, duration, vehicles, date, thereof, systems, table, conditions, force, cycle, level, annex, granted, exceed, measured, entry, phase, production, extension, sound, time, moped, runs, supplement

Text Extract:

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E/ECE/324
) Rev.1/Add.91/Rev.1/Amend.1
E/ECE/TRANS/505 )
February 22, 2017
STATUS OF UNITED NATIONS REGULATION
ECE 92-01
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF:
NON-ORIGINAL REPLACEMENT EXHAUST SILENCING SYSTEMS (RESS)
FOR MOTORCYCLES, MOPEDS AND THREE-WHEELED VEHICLES
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

REGULATION NO. 92-01
UNIFORM PROVISIONS CONCERNING THE APPROVAL OF
NON-ORIGINAL REPLACEMENT EXHAUST SILENCING SYSTEMS (RESS)
FOR MOTORCYCLES, MOPEDS AND THREE-WHEELED VEHICLES
CONTENTS
1.
Scope
2.
Definitions
3.
Application for Approval
4.
Markings
5.
Approval
6.
Specifications
7.
Modification and extension of the Approval of RESS 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
– Communication
– Example of the approval marks
– Requirements for fibrous absorbent materials used in RESS
Appendix
– Conditioning Methods

2.6. "Motorcycle, moped or three-wheeled vehicle" means motorcycles, mopeds or
three-wheeled vehicles 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;
Number and ratio of gears,
Number, type and arrangement of exhaust silencing systems.
3. APPLICATION FOR APPROVAL
3.1. The application for approval of a RESS or components thereof shall be submitted by its
manufacturer or by his duly accredited representative.
3.2. It shall be accompanied by the undermentioned documents in triplicate and the following
particulars:
(a)
(b)
(c)
A description of the motorcycle type(s) on which the RESS 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 motorcycle type shall be specified
and the motorcycle type approval number, if necessary;
A description of the complete RESS showing the relative position of each of its
components, together with instructions for their assembly;
Detailed drawings of each RESS 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.
3.3. At the request of the Technical Service conducting the tests for approval, the manufacturer of
the RESS shall submit:
(a)
(b)
Two samples of the RESS or its components submitted for approval;
A sample of the original exhaust silencing system with which the motorcycle was
equipped when submitted for type approval;

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 RESS 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 RESS 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 RESS or component designed for, the same
type(s) of motorcycle.
5.3. Notice of approval or extension or refusal of approval of a RESS 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 RESS 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 RESS 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 RESS; in this case the circle need not be repeated. Annex 2 to this
Regulation gives an example of the approval mark.

6.2. Specifications Regarding Sound Levels
The acoustic efficiency of the RESS or components thereof shall be verified by means of the
methods described in Regulation Nos. 9, 41 or 63. In particular, for the application of this
Paragraph reference shall be made to the series of amendments to Regulation No. 92 which
was in force at the time of type approval of the new vehicle. When the RESS or its
components is fitted to the motorcycle, moped or three-wheeled vehicle described in
Paragraph 3.3. (c), the sound level values obtained using the two methods (stationary and
running vehicle) shall satisfy the following condition:
They shall not exceed the values measured in conformity with the requirements of
Paragraph 3.3. (c), for the same moped, motorcycle, or three-wheeled vehicle when fitted with
the original silencing system during either the running test or the stationary test.
6.3. Measurement of Vehicle Performance
6.3.1. The RESS or its components shall be such as to ensure that the motorcycles, mopeds or
three-wheeled vehicles performance is comparable with that achieved with the original
exhaust silencing system or components thereof.
6.3.2. The RESS 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 3.3.3. above.
6.3.3. The verification shall be carried out by measuring the output curve in accordance with
Paragraph 6.3.4.1. or 6.3.4.2. The maximum power and the maximum power speed
measured with the RESS 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%.
6.3.4. Test Method
6.3.4.1. Engine Test Method
The measurements shall be carried out on the engine referred to in Paragraph 3.3. (d) or, if it
is not available, on the engine of the motorcycle referred to in Paragraph 3.3. (c), the engine
being in both cases mounted on a dynamometer.
6.3.4.2. Motorcycle Test Method
The measurements shall be carried out on the motorcycle referred to in Paragraph 3.3. (c).
The values obtained with the original silencing system shall be compared with those obtained
with the RESS. The test shall be conducted on a roller dynamometer.
6.4. Additional provisions regarding the RESS or its components filled with fibrous materials
The use of fibrous absorbent material shall be permitted in the construction of the RESS only
if the requirements in Annex 3 are met:
6.5. Evaluation of the Emission of Pollutants of Vehicles Equipped with Replacement
Silencer System
The vehicle referred to in Paragraph 3.3. (c) exhaust silencing system (RESS) of the type for
which approval is requested, shall fulfil the pollution requirements according to the type
approval of the vehicle. The evidence shall be documented in the test report.

9. PENALTIES FOR NON-CONFORMITY OF PRODUCTION
9.1. The approval granted in respect of a type of RESS or its components under this Regulation
may be withdrawn if the requirements laid down in Paragraph 8 above are not complied with,
or if the RESS or its components fail to pass the tests provided for in Paragraph 8. (b) above.
9.2. If a Contracting Party to the Agreement applying this Regulation withdraws an approval it has
previously granted, it shall forthwith so notify the other Contracting Parties to the 1958
Agreement applying this Regulation, by means of a communication form conforming to the
model contained in Annex 1 to this Regulation.
10. PRODUCTION DEFINITIVELY DISCONTINUED
If the holder of the approval completely ceases to manufacture a type of replacement
silencing system or components thereof approved in accordance with this Regulation, he shall
so inform the authority which granted the approval which shall in turn inform thereof the other
Contracting Parties to the 1958 Agreement applying this Regulation, by means of a copy of
the communication form conforming to the model contained in Annex 1 to this Regulation.
11. NAMES AND ADDRESSES OF TECHNICAL SERVICES RESPONSIBLE FOR
CONDUCTING APPROVAL TESTS, AND OF TYPE APPROVAL AUTHORITIES
The Contracting Parties to the 1958 Agreement which apply this Regulation shall
communicate to the United Nations Secretariat the names and addresses of the Technical
Services responsible for conducting approval tests and of the Type Approval Authorities
which grant approval and to which forms certifying approval or extension or refusal or
withdrawal of approval, or production definitively discontinued issued in other countries, are to
be sent.

6. Transmission
6.1. Type of transmission: non-automatic gearbox/automatic gearbox: ...............................................
6.2. Number of gears: ...........................................................................................................................
7. Equipment
7.1. Exhaust silencer
7.1.1. Manufacturer or authorized representative (if any): .......................................................................
7.1.2. Model: .............................................................................................................................................
7.1.3. Type: ......................... in accordance with Drawing No. ................................................................
7.2. Intake silencer
7.2.1. Manufacturer or authorized representative (if any): .......................................................................
7.2.2. Model: .............................................................................................................................................
7.2.3. Type: ................... in accordance with Drawing No. .....................................................................
8. Gears used for test of motor cycle in motion: ................................................................................
9. Final drive ratio(s): .........................................................................................................................
10. ECE type approval number of tyre(s): ............................................................................................
If not available, the following information shall be provided:
10.1. Tyre manufacturer: .........................................................................................................................
10.2. Commercial description(s) of the type of tyre (by axle), (e.g. trade name, speed index, load
index): .............................................................................................................................................
10.3. Tyre size (by axle): .........................................................................................................................
10.4. Other type approval number (if available): .....................................................................................
11. Masses
11.1. Maximum permissible gross weight: ......................................................................................... kg
11.2. Test mass: ................................................................................................................................. kg
11.3. Power to mass ratio index (PMR): .................................................................................................
12. Vehicle length: ............................................................................................................................ m
12.1. Reference length l : .................................................................................................................. m

19. In-use compliance reference data
19.1. Gear (i) or, for vehicles tested with non-locked gear ratios, the position of the gear selector
chosen for the test: .........................................................................................................................
19.2. Pre-acceleration length l : ........................................................................................................ m
19.3. Vehicle speed at the beginning of the period of acceleration (average of 3 runs) for gear (i):
............................................................................................................................................... km/h
19.4. Sound pressure level L : .................................................................................................. dB(A)
20. Deviations in calibration of sound level meter: ..................................................................... dB(A)
21. Date of submission of vehicle for approval: ...................................................................................
22. Technical Service performing the approval tests: ..........................................................................
23. Date of report issued by that Service: ............................................................................................
24. Number of report issued by that Service: .......................................................................................
25. Approval granted/extended/refused /withdrawn : .........................................................................
26. Position of approval mark on the motorcycle: ................................................................................
27. Place: .............................................................................................................................................
28. Date: ...............................................................................................................................................
29. Signature: .......................................................................................................................................
30. The following documents, bearing the approval number shown above, are annexed to this
communication:
Drawings, diagrams and plans of the engine and of the noise reduction system;
Photographs of the engine and of the exhaust or silencing system;
List of components, duly identified constituting the noise reduction system.

ANNEX 3
REQUIREMENTS FOR FIBROUS ABSORBENT MATERIALS USED IN RESS
(See Paragraph 6.4. 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 following conditioning methods in accordance
with the manufacturer's choice in accordance with the Appendix.
5. Exhaust gases are not in contact with fibrous materials and fibrous materials are not under
the influence of pressure variations.

1.3. Three-wheeled Vehicles
1.3.1. Depending on the category of vehicle, the minimum distance to be completed during
conditioning shall be in accordance with Table 2.
Table 2
Category of Vehicle and Minimum Distance to be Completed During Conditioning
Category of vehicle
according to cylinder capacity (cc)
Distance
(km)
≤250 4 000
>250 ≤500 6 000
>500 8 000
1.3.2. 50% ± 10% of this conditioning cycle shall consist of town driving and the remainder of
long-distance runs at high speed; the continuous road cycle may be replaced by a
corresponding test-track programme.
1.3.3. The two speed regimes shall be alternated at least six times.
1.3.4. The complete test programme shall include a minimum of 10 breaks of at least 3h duration in
order to reproduce the effects of cooling and condensation.
2. CONDITIONING BY PULSATION
2.1. The exhaust system or components thereof shall be fitted to the motorcycle or to the engine.
In the former case, the motorcycle shall be mounted on a roller dynamometer. In the second
case, the engine shall be mounted on a test bench.
The test apparatus, a detailed diagram of which is shown in Figure 1, is fitted at the outlet of
the exhaust system. Any other apparatus providing equivalent results is acceptable.
2.2. The test equipment shall be adjusted so that the flow of exhaust gases is alternatively
interrupted and restored 2,500 times by a rapid-action valve.
2.3. The valve shall open when the exhaust gas back-pressure, measured at least 100mm
downstream of the intake flange, reaches a value of between 0.35 and 0.40bar. Should such
a figure be unattainable because of the engine characteristics, the valve shall open when the
gas back-pressure reaches a level equivalent to 90% of the maximum that can be measured
before the engine stops. It shall close when this pressure does not differ by more than 10%
from its stabilised value with the valve open.
2.4. The time-delay switch shall be set for the duration of exhaust gases calculated on the basis of
the requirements of Paragraph 4.2.3 above.
2.5. Engine speed must be 75% of the speed (S) at which the engine develops maximum power.
2.6. The power indicated by the dynamometer must be 50% of the full-throttle power measured at
75% of engine speed (S).

3.2.3. Each test-bench cycle consists of six phases. The engine conditions for and the duration of
each phase shall be in accordance with Table 4.
Phase
Table 4
Engine Conditions for and the Duration of Each Phase for Motorcycles
Conditions
Duration of phase
(minutes)
PMR ≤ 50 PMR > 50
1 Idling 6 6
2 25% load at 75% S 40 50
3 50% load at 75% S 40 50
4 100% load at 75% S 30 10
5 50% load at 100% S 12 12
6 25% load at 100% S 22 22
Total Time 150 150
3.2.4. During this conditioning procedure, at the request of the manufacturer, the engine and the
silencer may be cooled so that the temperature recorded at a point not more than 100mm
from the exhaust gas outlet does not exceed that measured when the motorcycle is running at
110 km/h or 75% of S in top gear. The engine and/or motorcycle speeds are determined to
within ± 3%.
3.3. Mopeds
3.3.1. Conditioning consists of three test cycles.
3.3.2. Each test-bench cycle shall be followed by a break of at least 6h duration in order to
reproduce the effects of cooling and condensation.

3.4.3. Each test-bench cycle shall consist of six phases. The engine conditions for and the duration
of each phase shall be as given in Table 7.
Phase
Table 7
Engine Conditions for the Duration of Each Phase for Three Wheeled Vehicles
Conditions
Engines of less
than 250 cm
Duration of phase
(minutes)
Engines of not less
than 250 cm
1 Idling 6 6
2 25% load at 75% S 40 50
3 50% load at 75% S 40 50
4 100% load at 75% S 30 10
5 50% load at 100% S 12 12
6 25% load at 100% S 22 22
Total Time 150 150
3.4.4. During this conditioning procedure, at the request of the manufacturer, the engine and the
silencer may be cooled in order that the temperature recorded at a point not more than
100mm from the exhaust gas outlet does not exceed that measured when the vehicle is
running at 110 km/h or 75% of S in top gear. The engine and/or vehicle speeds shall be
determined to within ± 3%.

Exhaust Silencer Replacement Systems - Motorcycles.