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General| Engine Type | Inline-4 |
|---|---|
| Displacement | 1998 cc |
| Fuel Type | Petrol |
| Turbocharged | Yes |
| Compression Ratio | 11.0:1 |
| Fuel System | Direct Injection |
| Redline | 6500 rpm |
| Valvetrain | DOHC |
| Bore x Stroke | 82.0 mm x 94.6 mm |
Explains the warning symbol used to draw attention to important information.
Details technical improvements for the B46TU engine to meet emission requirements, including new features.
Highlights technical improvements for the B48TU engine, such as increased power, reinforced crankshaft, and new components.
Explains how to identify the B46TU and B48TU engines, covering numbering systems and location on the crankcase.
Provides key technical specifications for B46B2001 and B48B20T1 engines, including power, torque, and displacement.
Lists the vehicle models, such as G20 330i and G29 Z4, that use the new B46TU and B48TU engines.
Describes the engine housing, focusing on the cylinder head material and minor modifications for the B46TU.
Details the cylinder head, noting it is made of aluminum and has slight modifications compared to the B46.
Covers the crankshaft drive system, including revisions for the B46TU and reinforced crankshaft for B48A20T1.
Compares B46 and B46TU crankshafts, highlighting weight savings and material adaptations for improved performance.
Explains the connecting rod, its components, and the IROX-coated bearing shells used for reduced friction and wear.
Details the single-part chain drive for camshafts and oil/vacuum pump, including chain type, tensioner, and guide rails.
Discusses the valve gear system, focusing on the VANOS unit and its relation to the single-part chain drive.
Explains the VANOS unit and changes to camshaft sprockets (46 teeth) following the transition to a single-part chain drive.
Details the single-belt drive layout for ancillary components, its improvements in saving material and space, and automatic tensioning.
Introduces the split cooling concept as a new development for the B46TU engine, modifying the N63TU2 system for faster warm-up.
Describes the heat management module, which replaces the characteristic map thermostat and controls coolant flow via a rotary valve.
Details the coolant circulation and valve positions during the engine's cold-start phase, with coolant primarily bypassing the crankcase.
Explains the coolant flow and valve positions during the engine warm-up phase, routing coolant through the cylinder head, turbocharger, and oil/coolant HX.
Describes the coolant flow and valve positions when the engine is at operating temperature, managing circulation through different circuits based on load.
Illustrates coolant flow and valve positions during maximum cooling demand, opening the radiator connection fully and closing the bypass.
Explains the revised layout and function of the coolant pump, highlighting its pressure relief valve for efficient operation and leak reduction.
Details the exhaust turbocharger, its material, control via electrical wastegate valve, and design differences between B46TU and B48TU.
Describes fuel preparation adaptations for emission requirements, including high pressure pump and injectors designed for 350 bar injection pressure.
Explains the single-piston high pressure pump (HDP6), its drive via exhaust camshaft, modifications for 350 bar, and pressure control.
Covers the direct rail system, injector mounting, and potential issues with the fuel quantity control valve affecting pressure buildup.
Illustrates differences between HDVE5 and HDEV6 injectors used in B46TU engines, detailing injection patterns and volumetric distribution.
Explains the DME as the central control unit, its voltage range, integrated sensors, and its role in engine management.
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