BMW 3: Innovations B46TU/B48TU
BMW 3 Series G20 (2018-2025) 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:
New features
- Modified cylinder head
- Crankshaft weight reductions
- Single-part timing chain drive
- Modified belt guide
- Split cooling
- Heat management module with electrical Split Cooling Valve (SCV)
- Fuel preparation with 350 bar (5076 psi) injection pressure
- 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 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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Fuel recommendation
General information
Depending on the region, many gas stations sell
fuel that has been customized to winter or
summer conditions. Fuel that is available in winter,
for instance helps make a cold start easier.
Gasoline
General information
For the best fuel efficiency, the gasoline should
be sulfur-fr
Tire inflation pressure
General information
The tire characteristics and tire inflation pressure
influence the following:
The service life of the tires.
Road safety.
Driving comfort.
Fuel consumption.
Safety information
Warning
A tire with too little or no tire inflation pressure
may heat up significantly and sustai
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