# Commission Implementing Regulation (EU) 2018/988 of 27 April 2018 amending and correcting Implementing Regulation (EU) 2017/656 laying down the administrative requirements relating to emission limits and type-approval of internal combustion engines for non-road mobile machinery in accordance with Regulation (EU) 2016/1628 of the European Parliament and of the Council (Text with EEA relevance), Annex VIII

Extent: E+W+S+N.I.

Points 2.4.4 to 2.4.4.3 of Annex IX to Implementing Regulation (EU) 2017/656 are replaced by the following:
‘2.4.4.
Swept volume per cylinder
2.4.4.1.
Engine with a swept volume per cylinder ≥ 750 cm3
In order for engines with a swept volume per cylinder of ≥ 750 cm3 to be considered to belong to the same engine family, the spread of their swept volume per cylinder shall not exceed 15 per cent of the largest swept volume per cylinder within the engine family.
2.4.4.2.
Engine with a swept volume per cylinder < 750 cm3
In order for engines with an individual cylinder swept volume of < 750 cm3 to be considered to belong to the same engine family, the spread of their swept volume per cylinder shall not exceed 30 per cent of the largest swept volume per cylinder within the engine family.
2.4.4.3.
Engine with greater spread in swept volume per cylinder
Notwithstanding points 2.4.4.1 and 2.4.4.2, engines with a swept volume per cylinder that exceeds the spread defined in paragraphs 2.4.4.1 and 2.4.4.2 may be considered to belong to the same engine family subject to the approval of the approval authority. The approval shall be based on technical elements (calculations, simulations, experimental results etc.) showing that exceeding the spread does not have a significant influence on the exhaust emissions.’.

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Source: https://www.legislation.gov.uk/eur/2018/988/annex/VIII (the official version)
Page: https://openlegislation.uk/eu-regulation-2018-988/annex-VIII
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.