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BMW N55 User Manual

BMW N55
100 pages
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Fuel supply system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90
Fuel quantity control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90
Boost pressure control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90
Engine cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
System Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92
Crankshaft Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92
Ignition Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
Oil Pressure Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95
Oxygen Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95
Oxygen sensor before catalytic converter . . . . . . . . . . . . . . . . . . .96
Oxygen sensor after catalytic converter . . . . . . . . . . . . . . . . . . . . .96
Hot-film air mass meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
High Pressure Fuel Injector Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98
Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
Cylinder Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
Cylinder Head Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
Fuel Injectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
Ignition Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
Subject Page

Table of Contents

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BMW N55 Specifications

General IconGeneral
Compression Ratio10.2:1
Redline7, 000 rpm
Fuel SystemDirect injection
Engine Block MaterialAluminum
Cylinder Head MaterialAluminum
Fuel TypePremium Unleaded
Displacement3.0 L (2, 979 cc)
Bore x Stroke84.0 mm x 89.6 mm (3.31 in x 3.53 in)
TurbochargerTwin-scroll turbocharger
ValvetrainDOHC, variable valve timing (VANOS)
Oil Capacity6.5 L (6.9 US qt)
Cooling SystemLiquid-cooled
Torque300-330 lb-ft (407-447 Nm)
Maximum Torque300-330 lb-ft (407-447 Nm)

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