CHASSIS MODIFICATIONS 2-49 E URO C ARGO E URO 4 - 5 Modification to the Engine Air Intake and Exhaust System 2.13 Modification to the Engine Air Intake and Exhaust System Modification which would alter the characteristics of the air intake and exhaust systems may not be carried out without prior IVECO authorisation. Any modifications must not alter the existing vacuum values of the intake or the exhaust back pressure shown in the table. Table 2.16 - Maximum back-pressure permitted at rated speed and full load The routing of the tubing must be as even as possible. Bends must not have an angle of less than 90є and the radii should not be lower than 2.5 times the external diameter.
Avoid kinks and use cross-sections which are no smaller than those correspondingto the original system. Anyconnections on the intake duct must guarantee resistance of the tube to penetration by water or dust and absence of sharp edges or welding burrs inside the tube. Sufficient clearance should be maintained (min. 150 mm) between the exhaust pipe and the electrical system, plastic hoses, the spare wheel, the plastic fuel tank, etc. Lower values (e.g. 80 mm) may be permitted if suitable sheet metal shielding is used. Further reductions require the use of heat insulation and the substitution of the plastic tubes with steel pipes.
Any work done on the exhaust system of the vehicle requires that the vehicle be homologated again with regard to noise and smoke wherever government regulations require it. The air intake must be positioned to avoid the intake of hot air from the engine and/or of dusty air or snow and rain. The apertures for the intake of air which may have to be made in the bodies of vans, must have a working surface of not less than twice that of the master hose located upstream of the filter and in any case not less than the original one. These apertures (e.g. openings in the grill) must be of such a dimension that they do not become obstructed.
It is not permissible to modify or substitute the original air filter; the silencer body cannot be altered. Modifications to the equipment (injectors, engine control unit etc.) are not permissible as this may alter the correct functioning of the engine and adversely affect the emissions of gases from the exhaust. Modification to the Engine Air Intake and Exhaust System Print 603.93.431 Base - July 2006 Revi - June 2007 Engine Engine Code Maximum exhaust back pressure (kPa) Maximum intake back pressure (kPa) E14 F4AE3481C 10 6 ,3 E16 F4AE3481D E18 F4AE3481B E19 F4AE3481A E19 F4AE3681C 28 6,3 E22 F4AE3681B E25 F4AE3681D E28 F4AE3681E E30 F4AE3681A