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The Recreational Craft Regulations 2017

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2.EXHAUST EMISSION REQUIREMENTS

Propulsion engines shall be designed, constructed and assembled so that when correctly installed and in normal use, emissions shall not exceed the limit values obtained from point 2.1, Table 1 and point 2.2, Tables 2 and 3:

2.1.Values applying for the purposes of Article 55(2) and Table 2 of point 2.2:
Table 1
(g/kWh)
TypeCarbon monoxideHydrocarbonsNitrogen oxidesNOxParticulatesPT
ABnABn
Two-stroke spark ignition150,0600,01,030,0100,00,7510,0Not applicable
Four-stroke spark ignition150,0600,01,06,050,00,7515,0Not applicable
Compression ignition5,0001,52,00,59,81,0

Where A, B and n are constants in accordance with the table, PN is the rated engine power in kW.

2.2.Values applying from 18 January 2016:
Table 2

Exhaust emission limits for compression ignition (CI) engines(2)

a
+

Alternatively, compression-ignition engines with rated engine power at or above 37 kW and below 75 kW and with a swept volume below 0,9 L/cyl shall not exceed a PT emission limit of 0,20 g/kWh and a combined emission limit of 5,8 g/kWh.

b
++

Any compression-ignition engine shall not exceed a Carbon monoxide (CO) emission limit of 5,0 g/kWh.

Swept VolumeSV(L/cyl)Rated Engine Power PN(kW)ParticulatesPT(g/kWh)Hydrocarbons + Nitrogen Oxides(g/kWh)
The values referred to in table 1
(1)0,34,7
0,155,8
0,145,8
0,125,8
0,125,8
0,115,8
Table 3

Exhaust emission limits for spark ignition (SI) engines

Type of engineRated EnginePower PN(kW)Carbon monoxideCO(g/kWh)Hydrocarbons + Nitrogen Oxides(g/kWh)
Stern-drive and inboard engines755
35016
35022
Outboard engines and PWC engines30
300
2.3.Test cycles:

Test cycles and weighting factors to be applied:

The following requirements of ISO standard 8178-4:2007 shall be used, taking into account the values set out in the table below.

For variable speed CI engines test cycle E1 or E5 shall be applied or alternatively, above 130 kW, test cycle E3 may be applied. For variable speed SI engines test cycle E4 shall be applied.

Cycle E1, Mode number12345
SpeedRated speedIntermediate speedLow-idle speed
Torque, %1007575500
Weighting factor0,080,110,190,320,3
SpeedRated speedIntermediate speedLow-idle speed
Cycle E3, Mode number1234
Speed, %100918063
Power, %100755025
Weighting factor0,20,50,150,15
Cycle E4, Mode number12345
Speed, %100806040Idle
Torque, %10071,646,525,30
Weighting factor0,060,140,150,250,4
Cycle E5, Mode number12345
Speed, %100918063Idle
Power, %1007550250
Weighting factor0,080,130,170,320,3

[F1Notified] [F1Approved] bodies may accept tests carried out on the basis of other tests cycles as specified in a [F2harmonised] [F2designated] standard and as applicable for the engine duty cycle.

2.4.Application of the propulsion engine family and choice of parent propulsion engine

The engine manufacturer shall be responsible for defining those engines from his range which are to be included in an engine family.

A parent engine shall be selected from an engine family in such a way that its emissions characteristics are representative for all engines in that engine family. The engine incorporating those features that are expected to result in the highest specific emissions (expressed in g/kWh), when measured on the applicable test cycle, should normally be selected as the parent engine of the family.

2.5.Test fuels

The test fuel used for exhaust emission testing shall meet the following characteristics:

Petrol Fuels
PropertyRF-02-99UnleadedRF-02-03Unleaded
minmaxminmax
Research Octane Number (RON)9595
Motor Octane Number (MON)8585
Density at 15 oC (kg/m3)748762740754
Initial boiling point (°C)24402440
Mass fraction of sulphur (mg/kg)10010
Lead content (mg/l)55
Reid vapour pressure (kPa)5660
Vapour pressure (DVPE) (kPa)5660
Diesel Fuels
PropertyRF-06-99RF-06-03
minmaxminmax
Cetane number52545254
Density at 15 oC (kg/m3)833837833837
Final boiling point (°C)370370
Flash point (°C)5555
Mass fraction of sulphur (mg/kg)To be reported300 (50)10
Mass fraction of ash (%)To be reported0,010,01

[F3Notified] [F3Approved] bodies may accept tests carried out on the basis of other tests fuel as specified in a [F4harmonised] [F4designated] standard.

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