DIESEL ENGINE SMOKE AND THE UNO-EEC CHECKING REGULATION No. 24

It was studied whether the actual smoke exhaust by Diesei wehicle engines - is it that in steady-state or in unsteady-state operation at free acceleration, or does it differ from either? Smoke values obtained in steady-state operation are in themselves not typical of those in unsteady-state operation (e. g. urban traffic). No direct relationship can be found between smoke values in either operation. To check real (unsteady-state) smoke exhaust, Diesel engines have to be cycle tested - similar as for Qtto engines