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Commission Directive 2005/78/EC of 14 November 2005 implementing Directive 2005/55/EC of the European Parliament and of the Council on the approximation of the laws of the Member States relating to the measures to be taken against the emission of gaseous and particulate pollutants from compression-ignition engines for use in vehicles, and the emission of gaseous pollutants from positive ignition engines fuelled with natural gas or liquefied petroleum gas for use in vehicles and amending Annexes I, II, III, IV and VI thereto (Text with EEA relevance) · European Union

Section 2.1 is replaced by the following: ‘2.1. Engine Test Conditions 2.1.1. The absolute temperature (T a) of the engine air at the inlet to the engine expressed in Kelvin, and the dry atmospheric pressure (p s), expressed in kPa shall be measured and the parameter f a shall be determined according to the following provisions. In multi-cylinder engines having distinct groups of intake manifolds, for example, in a “V” engine configuration, the average temperature of the distinct groups shall be taken. 2.1.2. Test Validity For a test to be recognised as valid, the parameter f a shall be such that: 0,96 ≤ f a ≤ 1,06’ for compression-ignition engines: Naturally aspirated and mechanically supercharged engines: Text of image Turbocharged engines with or without cooling of the intake air: Text of image for spark-ignition engines: Text of image

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Source: EUR-Lex (Cellar) · retrieved 2026-11-10 · Text as adopted (Official Journal); later amendments are not incorporated in this text.