BMW N55 - Cylinder Head Cover

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N55 Engine
Cylinder Head Cover
The cylinder head cover is a new development. The accumulator for the vacuum system
is built into the cylinder head cover.
All components for crankcase ventilation and the blow-by channels are also integrated
into the cylinder head cover. The non-return valves ensure that the blow-by gasses are
reliably added to the intake air in both engine modes (NA and Boost)
The N55 engine is equipped with a vacuum-controlled crankcase ventilation system;
therefore, a regulated negative pressure of approximately 38 mbar is maintained.
N55, cylinder head cover with crankcase ventilation
Index Explanation
1
Connection, blow-by gas to clean air pipe
2
Connection, vacuum line to vacuum pump
3
Reserve, vacuum connection
4
Vacuum connection to electropneumatic pressure converter EPDW for wastegate valve
5
Duct for blow-by gas feed into intake system with integrated non-return valve
6
Blow-by gas duct with settling chamber, impact plate, pressure control valve and non-return valves
7
Pressure regulating valve