BMW N55 - Overview

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N55 Engine
Overview
The VANOS system has been optimized to provide even faster adjustment speeds of the
VANOS units. The aluminum VANOS units are much lighter and are also less susceptible
to soiling. It can be seen by comparing the N54 VANOS system with the N55 VANOS
that fewer oil passages are required and that the non-return valves are no longer on the
cylinder head but rather incorporated into the solenoid valves on N55.
N55, VANOS with oil supply
Index Explanation
1
Main oil duct
2
VANOS solenoid valve, intake side
3
VANOS solenoid valve, exhaust side
4
Chain tensioner
5
VANOS adjustment unit, exhaust side
6
VANOS adjustment unit, intake side