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N55 Engine
Cylinder Head
Direct fuel injection, turbocharging and Valvetronic systems are combined for the first time
on a BMW 6-cylinder engine. The cylinder head of the N55 engine is a new develop-
ment. It features a very compact design and is equipped with third generation Valvetronic.
The combination is referred to as Tu r b o -Val v e t ro n i c - D i re c t- I n j e c t i o n (TVDI).
This system reduces CO2 emission and fuel consumption by 3 - 6%.
There are now no connections for the VANOS non-return valves as they have been
integrated in the solenoid valves. The cylinder head also features cooling passages
near the fuel injectors; providing indirect cooling.
N55, cylinder head
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