1. Combustion engines main principles and definitions
Reciprocating combustion engines architecture
Reciprocating engines dynamic properties
Engine components and systems
The engine management system for gasoline and Diesel engines
The emission Requirements & Technology
Engine vehicle integration
7.1 Engine layout and mounting
7.2 Engine-vehicle cooling system
7.3 Intake system
7.4 Exhaust system

2. Main functions
The main function of an engine intake system is to deliver combustion air to the engine.
To condition the air, just particulate removal, to protect engine parts from airborne impurities (dirt and other particulate matter).
To reduce noise transmitted from the engine intake.
To give a positive contribution to the engine performance
Composition
The intake snorkel (opening for the intake air to enter the system)
Tube leading to the air filter (“dirty air line”)
Air filter
Tube leading to the engine (“clean air line”)
Air mass flow meter
Throttle body
Resonator (silencer) to minimize the noise entering the cabin
Blow by inlet

3. Typical engine intake system
snorkel
Dirty air
Filter box
Air filter
Clean air
Typical engine intake system

4. Intake system main design guidelines
5.0 ¸ 5.5 l/l of engine displacement
Resonator
Sizing for intake noise reduction
Technology / costy
Mean air flow rate (depending on engine diaplacement)
Airborn impurity (vehicle mission)
Replacemnet interval
Filter volume function of

5. Intake system main design guidelines
Example of the relation among filtering surface, dust concentration and service interval (air flow rate 220 m3/h)

6. Engine on-board air filter

7. Example of vehicle on-board air filter

8. Example of vehicle on-board air filter for a diesel engine

9. Intake line pressure drop minimization
Theoretical effect of the charge air pressure in the intake manifold on the engine maximum output motore

10. The air charge optimization
Various component effect on the engine torque and volumetric efficiency

11. Snorkel positioning
Intake opening point (snorkel) positioned just below the left front lights)

12. Snorkel positioning
Intake opening point (snorkel) positioned on the vehicle front end outside the engine compartment (fresh and dynamic air))

13. Mass flow meter positioning
blow-by inlet
connection
Compressor
inlet
Flow meter
Air filter
Air mass flow meter positioning
Flange-hose installation
Air mass flow meter positioning
Hose-hose installation