BMW 3 Owners & Service Manuals

BMW 3: Innovations B46TU/B48TU

BMW 3 Series G20 (2018-2026) Training manual / B46TU-B48TU Engines / Introduction / Innovations B46TU/B48TU

Innovations B46TU

To meet the legal requirements for emissions, a number of technical improvements have been implemented. The technical updates for the B46TU engine include the following new features:

Innovations B46TU
New features

  1. Modified cylinder head
  2. Crankshaft weight reductions
  3. Single-part timing chain drive
  4. Modified belt guide
  5. Split cooling
  6. Heat management module with electrical Split Cooling Valve (SCV)
  7. Fuel preparation with 350 bar (5076 psi) injection pressure
  8. DME 8

Weight savings in the crankshaft drive area, injection pressure boosting in the fuel preparation area, and function changes in the engine cooling area have made it possible to reduce the CO2 emissions by 2.5 - 5%, while increasing engine performance by 5 kW/20 Nm (8 hp/15 lb-ft).

Innovations B48TU

The technical improvements made to the B48TU engine a highlighted below:

  • 302 hp (225 kW)
  • 332 lb-ft (450 Nm)
  • Reinforced crankshaft with larger main bearing diameter.
  • New piston with modified compression.
  • New connecting rods without a bearing on small end.
  • Newly developed larger exhaust turbocharger with integrated air-diverter valve.
  • Modified fuel injectors with increased flow rate and 350 bar pressure.
  • Newly developed intake air pipes for higher power and torque.
  • Modified exhaust system to minimize back pressure.
  • Engine cover with M Performance logo.

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     Engine identification

    B46TU engine Engine identification - transverse mounted shown B48TU engine Engine identification - transverse mounted shown Engine number Engine identification The 7-digit engine identification

     Engine Mechanical

     Engine housing, Crankshaft drive

    Engine housing Cylinder head The cylinder head is made of aluminum. Only slight modifications have been made to the B46TU head compared to the B46. Cylinder head Crankshaft drive Crankshaft Comparis

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     Heat management module

    The heat management module replaces the characteristic map thermostat. Heat management module Electrical Split Cooling Valve (SCV) Coolant output towards the coolant pump Electrical actuator Rotary valve A rotary valve inside the heat management module ensures needs-driven cooling of the var

     Maintenance

    BMW maintenance system The maintenance system indicates required maintenance measures, and thereby provides support in maintaining road safety and the operational reliability of the vehicle. In some cases, scopes and intervals of the maintenance system may vary according to the country version. Rep

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