BMW N55 - Exhaust, Turbocharger, and Vacuum Systems

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N55 Engine
Air Intake and Exhaust System
Air Intake System
Several functions of the air intake system have been optimized for the N55 engine:
• The unfiltered air is routed up to the intake silencer (similar to the N54 engine).
• The filtered air duct is completely new and simplified to accommodate the new
turbocharger.
• The crankcase ventilation system has been redesigned.
• The diverter valve has been integrated into the compressor housing
of the turbocharger.
• The fuel tank ventilation has been correspondingly adapted.
The design layout of the air intake system has been simplified, compared to the dual
turbocharger set up of the N54.
N55, Air Intake System
Index Explanation Index Explanation
1
Intake snorkel
9
Charge-air pipe
2
Unfiltered air pipe
10
Intercooler
3
Intake silencer
11
Charge-air pipe
5
Air intake silencer cover
12
Boost pressure-temperature sensor
6
Hot-film air mass meter
13
Throttle valve
7
Crankcase ventilation connection
14
Intake manifold
8
Exhaust turbocharger