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The Mercedes-Benz M256 engine is a turbocharged straight-six engine produced since 2017, when it was first introduced on the W222 S450.[1] It replaces the previous M276 V6 engine,[2] and is Mercedes' first straight-six engine since the M104 engine.[3]

Mercedes-Benz M256
Overview
Manufacturer	Mercedes-Benz
Production	2017–present
Layout
Configuration	Straight-six engine
Displacement	3.0 L (2,999 cc)
Cylinder bore	83 mm (3.27 in)
Piston stroke	92.4 mm (3.64 in)
Block material	Aluminium alloy
Head material	Aluminium alloy
Valvetrain	DOHC 4 valves x cyl.
Compression ratio	10.5:1
Combustion
Supercharger	BorgWarner's eBooster® Mitsubishi Crankshaft ISG system
Turbocharger	Single-turbo twin-scroll
Fuel system	Direct injection
Fuel type	Petrol
Cooling system	Water cooled
Output
Power output	270–320 kW (367–435 PS)
Torque output	500–520 N⋅m (369–384 lb⋅ft)
Chronology
Predecessor	Mercedes-Benz M276 engine

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] 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:

Engine	Power	Torque	Years
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 E30 DEH LA GR

• 2017–2020 W222 S 450 / S 450 4MATIC (European models only)[9]
• 2018–present C257 CLS 450 / CLS 450 4MATIC[10]
• 2019–present X290 AMG GT 43 / GT 43 4MATIC+
• 2019–present X290 AMG GT 50 / GT 50 4MATIC+ (China only)
• 2019–present V167 GLE 450 4MATIC
• 2019–present X167 GLS 450 4MATIC
• 2019–present Austro Daimler Bergmeister PHEV
• 2020–present W213 E 450 4MATIC
• 2021–present W223 S 450 4MATIC
• 2021–present W223 S 580 e 4MATIC

M256 E30 DEH LA G

• 2017–2020 W222 S 500[11]
• 2018–present W213 E 53 4MATIC+[12]
• 2018–present C257 CLS 53 4MATIC+[13]
• 2018–present X290 AMG GT 53 4MATIC+[14]
• 2020–present V167 GLE 53 4MATIC
• 2021–present W223 S 500 4MATIC
• 2021–present Aston Martin DBX Straight-Six

References

External links

• Press release

На других языках

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- [en] Mercedes-Benz M256 engine

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[it] Mercedes-Benz M256

La sigla Mercedes-Benz M256 indica un motore a scoppio prodotto a partire dal 2017 dalla Casa tedesca Mercedes-Benz.

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[ru] Mercedes-Benz M256 (двигатель)

Mercedes-Benz M256 – это турбированный рядный шестицилиндровый двигатель. Был впервые представлен на W222 S450. Он заменяет предыдущий двигатель V6 M276, производится с 2017 года.

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