Cylinder Head: Notes
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 development. It features a very compact design and is equipped with third generation Valvetronic.
The combination is referred to as Turbo-Valvetronic-Direct-Injection (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.