| Mercedes-Benz M256 | |
|---|---|
 | |
| Overview | |
| Manufacturer | Mercedes-Benz |
| Production | 2017–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 material | Aluminium 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. It replaces the previous M276 V6 engine, and is Mercedes' first straight-six engine since the M104 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. It uses an aluminium alloy block with dual overhead camshafts and has 4 valves per cylinder. The M256 uses a 48V electrical system to operate a BorgWarner electric supercharger, which can spin up to 70,000 rpm to reduce turbo lag. 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.
Models
Engine output excluding the additional 48V system boost available on the S 500:
| Engine | Power | Torque | Years |
|---|---|---|---|
| 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
- 2021-present S 400 L/S 450 L (China only)
M256 E30 DEH LA GR
- 2017–2020 W222 S 450 / S 450 4MATIC (European models only)
- 2018–2023 C257 CLS 450 / CLS 450 4MATIC
- 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
- 2018–2023 W213 E 53 4MATIC+
- 2018–2023 C257 CLS 53 4MATIC+
- 2018–present X290 AMG GT 53 4MATIC+
- 2020–present V167 GLE 53 4MATIC
- 2021–present W223 S 500 4MATIC
- 2021–present Aston Martin DBX Straight-Six
References
- "2018 Mercedes-Benz S500 European-Spec First Drive: Ice, Ice Baby. Too Cool, Too Cool". MotorTrend. 19 July 2017. Retrieved 2018-07-03.
- "Mercedes To Phase Out V6 Engines In Favor Of Straight-Sixes". Motor1.com. Retrieved 2018-07-03.
- "Mercedes-Benz M256 inline 6-cylinder gasoline engine - MarkLines Automotive Industry Portal".
- "Why Mercedes' new inline six matters, even if no one is sure when we'll see it". Autoweek. Retrieved 2018-07-03.
- "First Drive: 2018 Mercedes-Benz S-Class | Automobile Magazine". Automobile Magazine. 2017-07-18. Retrieved 2018-07-03.
- "This Little Fan Could Fix the Turbocharger's Biggest Problem—And Make Cars Way More Efficient". WIRED. Retrieved 2018-07-03.
- "Nine Things You Must Know about the New Mercedes Inline-Six". Car and Driver. Retrieved 2018-07-03.
- "Why Mercedes-Benz Is Going All In on Straight-Sixes". Road & Track. 2016-11-01. Retrieved 2018-07-03.
- Kuruvilla, George. "Everything you need to know about the all-new 2021 Mercedes-Benz S-Class". Khaleej Times. Retrieved 2022-12-18.
- "2018 Mercedes-Benz S 450". Car and Driver. Retrieved 2018-07-03.
- Kable, Greg (2017-11-19). "2018 Mercedes-Benz CLS review - Mercedes-Benz's new CLS from the passenger seat". Drive. Retrieved 2018-07-03.
- Panait, Mircea (2017-09-16). "Aston Martin Straight-6 Engine Could Come Back Thanks To Mercedes-Benz". autoevolution. Retrieved 2018-07-03.
- "The 2019 Mercedes CLS53 and E53 Bring Straight-Sixes Back to AMG". Road & Track. 2018-01-15. Retrieved 2018-07-03.
- "Hot Hybrids: Mercedes Launches Electrified AMG 53 Range". Motor1.com. Retrieved 2018-07-03.
- "630bhp Mercedes-AMG GT 4-door Coupé: Edition 1 version confirmed | Autocar". www.autocar.co.uk. Retrieved 2018-07-03.