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Beginning in 1996 the exhaust emissions of off-highway heavy-duty diesel engines between 130-560 kW (175-750hp) will be regulated by the EPA, (1). Along with the emission regulations comes the difficulty of establishing a set of standard test procedures which allow engine manufacturers and regulatory agencies to compare emissions data based on similar test methods. In order to remedy this problem, the International Organization for Standardization (ISO) has come up with an exhaust measurement procedure, ISO 8178, that can be applied worldwide to off-highway heavy-duty diesel engines, (2). The ISO 8178 procedure is based on steady-state operating modes combined with weighting factors that together represent a cycle for a specific engine application. The ISO 8178 test procedure allows the exhaust emissions to be sampled with either a full flow dilute or raw sampling system.