DAILY MCA2014 4x4 ‒ BODYBUILDER INSTRUCTIONS
CHASSIS INTERVENTIONS
2.10 MODIFYING THE ENGINE AIR INTAKE AND EXHAUST SYSTEMS
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– Printed 603.95.994 – 1 Ed. - Base 05/2015
2.10 MODIFYING THE ENGINE AIR INTAKE AND EXHAUST SYSTEMS
Note
The characteristics of the engine air intake and exhaust systems must not be modified. Modifications, if authorised by IVECO, must
not vary the original intake vacuum and exhaust counter-pressure values.
Table 2.10 - Maximum allowed back pressure at intake and exhaust under normal operating condi-
tions and at full load
engine Engine code Exhaust back pressure [kPa] Min - max intake back pressure [kPa]
.17 Euro VI F1CFL411F*A 40 1 - 9
.15 Euro III F1CE3481J*LF 15 1 - 8
Intake
The air intake must be mounted as to avoid intake of hot air from the engine compartment, or dust and water.
The intake compartment must be sealed airtight and fitted with rubber gaskets that prevent hot air recirculation. The gaskets must
be of high quality as to support a steady temperature of 100 ºC, with short durations of 120 ºC, without undergoing visible de-
formations or deteriorations. The compartment must keep airflow sections efficient for the entire circuit.
The holes that must be made in the box part of the van must have an area of about twice that of the cross-section of the pipe
upstream of the filter; these openings (e.g. grille holes) must have minimal dimensions to prevent possible clogging.
The following are not allowed:
● alterations or replacement of the original air filter with one of lower capacity;
● modifications to the silencer body;
● intervene on equipment (injection pump, regulator, injectors, etc.) that may compromise good engine performance and affect
exhaust gas emissions.
● change the Humidity sensor → Blow-by sequence in the segment between the air filter and turbine.
Lastly, it is necessary to check if new system approval is required in relation to specific national standards (sound level, smokiness).
Engine exhaust
If it is necessary to change the pipe layout despite the availability of various optional solutions in the catalogue, it is advisable to en-
visage:
● the simplest possible route (curvatures with radii of no less than 2.5 times the outer diameter, passage sections no smaller
than those of the original solution, absence of throttling);
● suitable distances (min. 150 mm) from electrical systems and plastic pipes (shorter distances progressively require plate guards,
thermal insulators or the replacement of plastic pipes with steel ones).
Authorisation must always be obtained from IVECO.
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