Engine Exhaust System. The test engine shall be equipped with an exhaust system presenting an exhaust back pressure at the upper limit specified by the manufacturer for the engine operating conditions which result in maximum declared power.
Engine Exhaust System. Visually check for leak corrosion, check condensation trap and muffler condition.
Engine Exhaust System. An exhaust system must be used presenting an exhaust back pressure within ± 1000 Pa of the upper limit of the engine operating at the speed of declared maximum power and full load and a volume within ± 40 per cent of that specified by the manufacturer. A test shop system may be used, provided it represents actual engine operating conditions. The exhaust system must conform to the requirements for exhaust gas sampling, as set out in annex 4, appendix 4, paragraph 3.4. and in annex 4, appendix 7, paragraph 2.2.1., EP and paragraph 2.3.1., EP. If the engine is equipped with an exhaust after-treatment device, the exhaust pipe must have the same diameter as found in-use for at least 4 pipe diameters upstream to the inlet of the beginning of the expansion paragraph containing the after-treatment device. The distance from the exhaust manifold flange or turbocharger outlet to the exhaust after- treatment device must be the same as in the vehicle configuration or within the distance specifications of the manufacturer. The exhaust back-pressure or restriction must follow the same criteria as above, and may be set with a valve. The after-treatment container may be removed during dummy tests and during engine mapping, and replaced with an equivalent container having an inactive catalyst support.
