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).


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

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