Mercedes-Benz M256 engine

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Mercedes-Benz M256
Mercedes M256 engine.png
Overview
Manufacturer Mercedes-Benz
Production2017–present
Layout
Configuration Straight-six
Displacement 2.5 L (2,498 cc)
3.0 L (2,999 cc)
Cylinder bore 83 mm
Piston stroke 77 mm, 92.4 mm
Cylinder block material Aluminium alloy
Cylinder head materialAluminium alloy
Valvetrain DOHC 4 valves x cyl
Compression ratio 10.5:1
Combustion
Supercharger BorgWarner eBooster
Turbocharger Single-turbo twin-scroll
Fuel system Direct injection
Fuel type Petrol
Cooling system Water cooled
Output
Power output 230–320 kW (313–435 PS)
Torque output 450–520 N⋅m (332–384 lb⋅ft)
Chronology
Predecessor Mercedes-Benz M276

The Mercedes-Benz M256 engine is a turbocharged straight-six engine produced since 2017, when it was first introduced on the W222 S 450. [1] It replaces the previous M276 V6 engine, [2] and is Mercedes' first straight-six engine since the M104 engine. [3]

Contents

Design

The M256 shares a modular design with other inline-four and V8 engines, which are all 500 cc (31 cu in) per cylinder. [4] It uses an aluminium alloy block with dual overhead camshafts and has 4 valves per cylinder. [5] The M256 uses a 48V electrical system to operate a BorgWarner electric supercharger, [6] which can spin up to 70,000 rpm to reduce turbo lag. [7] In the S 500's G variant engine, an integrated starter alternator also provides up to 16 kW (22 PS) and 250 N⋅m (184 lb⋅ft) of boost, and replaces the drive belts by managing the water pump and air conditioning; allowing for a smaller and lighter engine. [8]

Models

Engine output excluding the additional 48V system boost available on the S 500: [9]

EnginePowerTorqueYears
M256 E25
DEH LA GR
230 kW (313 PS; 308 hp) - 270 kW (367 PS; 362 hp)
at 5,500–6,100 rpm
450 N⋅m (332 lb⋅ft)
at 1,600–4,000 rpm
2021–
M256 E30
DEH LA GR
270 kW (367 PS; 362 hp)
at 5,500–6,100 rpm
500 N⋅m (369 lb⋅ft)
at 1,600–4,000 rpm
2017–
M256 E30
DEH LA G
320 kW (435 PS; 429 hp)
at 5,900–6,100 rpm
520 N⋅m (384 lb⋅ft)
at 1,800–5,500 rpm

M256 E25 DEH LA GR

M256 E30 DEH LA GR

M256 E30 DEH LA G

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References

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