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ISO 8178

ISO standard

Wikipedia contributorsAdapted for Fathomly · View authors
1 min read
Source updated November 26, 2025

ISO 8178 is a collection of steady state test cycles used for defining emission standards for non-road engines in the European Union, United States, Japan and other countries. Test cycle ISO 8178 C1 is also referred to as "Non-Road Steady Cycle" and used extensively. The Non-road Transient Cycle is supplementing it in some modern emission standards.

It is defined by the International Organization for Standardization (ISO).

01Parts

The ISO 8178 Reciprocating internal combustion engines, Exhaust emission measurement standard comes in 11 parts:

  • ISO 8178-1:2020 Part 1: Test-bed measurement systems of gaseous and particulate emissions
  • ISO 8178-2:2008 Part 2: Measurement of gaseous and particulate exhaust emissions under field conditions
  • ISO 8178-3:2019 Part 3: Test procedures for measurement of exhaust gas smoke emissions from compression ignition engines using a filter type smoke meter
  • ISO 8178-4:2020 Part 4: Steady-state and transient test cycles for different engine applications
  • ISO 8178-5:2021 Part 5: Test fuels
  • ISO 8178-6:2018 Part 6: Report of measuring results and test
  • ISO 8178-7:2015 Part 7: Engine family determination
  • ISO 8178-8:2015 Part 8: Engine group determination
  • ISO 8178-9:2019 Part 9: Test cycles and test procedures for test bed measurement of exhaust gas smoke emissions from compression ignition engines operating under transient conditions
  • ISO 8178-10:2002 Part 10: Test cycles and test procedures for field measurement of exhaust gas smoke emissions from compression ignition engines operating under transient conditions (Withdrawn in 2019)
  • ISO 8178-11:2006 Part 11: Test-bed measurement of gaseous and particulate exhaust emissions from engines used in nonroad mobile machinery under transient test conditions (Withdrawn in 2014-08-13)
Watch videos about ISO 8178Explainers and documentaries on YouTube (opens in a new tab)

Sources and credits

This article is adapted from the Wikipedia article “ISO 8178”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.

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