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N55 Engine
Combustion Chamber Geometry
The following graphic shows the arrangement of the individual components in the com-
bustion chamber. It can be seen that the BMW (spray-guided) high precision injection
(HPI) system is not used but rather a Bosch solenoid valve fuel injector with multi-hole
nozzle. The fuel injection is specially adapted to the combination of Valvetronic III and tur-
bocharging. For better illustration, a set of valves has been removed in the graphic.
N55, combustion chamber with components
Index Explanation
1
Valve seat, exhaust valve
2
Exhaust valve
3
Spark plug
4
Fuel injector
5
Intake valve
6
Valve seat, intake valve
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