Mercedes-Benz M256 engine

Last updated
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 (3.27 in)
Piston stroke 77 mm (3.03 in)
92.4 mm (3.64 in)
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
Oil system Dry sump. Oil supplied by Petronas
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 petrol-powered 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

Partial cutaway of an M256 engine IAA 2021, Munich (IAA10148).jpg
Partial cutaway of an M256 engine

2018–2023 C257 CLS 450 / CLS 450 4MATIC [11]

M256 E30 DEH LA G

References

  1. ↑ "2018 Mercedes-Benz S500 European-Spec First Drive: Ice, Ice Baby. Too Cool, Too Cool". MotorTrend. 19 July 2017. Retrieved 2018-07-03.
  2. ↑ "Mercedes To Phase Out V6 Engines In Favor Of Straight-Sixes". Motor1.com. Retrieved 2018-07-03.
  3. ↑ "Mercedes-Benz M256 inline 6-cylinder gasoline engine - MarkLines Automotive Industry Portal".
  4. ↑ "Why Mercedes' new inline six matters, even if no one is sure when we'll see it". Autoweek. Retrieved 2018-07-03.
  5. ↑ "First Drive: 2018 Mercedes-Benz S-Class | Automobile Magazine". Automobile Magazine. 2017-07-18. Retrieved 2018-07-03.
  6. ↑ "This Little Fan Could Fix the Turbocharger's Biggest Problem—And Make Cars Way More Efficient". WIRED. Retrieved 2018-07-03.
  7. ↑ "Nine Things You Must Know about the New Mercedes Inline-Six". Car and Driver. Retrieved 2018-07-03.
  8. ↑ "Why Mercedes-Benz Is Going All In on Straight-Sixes". Road & Track. 2016-11-01. Retrieved 2018-07-03.
  9. ↑ Kuruvilla, George. "Everything you need to know about the all-new 2021 Mercedes-Benz S-Class". Khaleej Times. Retrieved 2022-12-18.
  10. ↑ "2018 Mercedes-Benz S 450". Car and Driver. Retrieved 2018-07-03.
  11. ↑ Kable, Greg (2017-11-19). "2018 Mercedes-Benz CLS review - Mercedes-Benz's new CLS from the passenger seat". Drive. Retrieved 2018-07-03.
  12. ↑ Panait, Mircea (2017-09-16). "Aston Martin Straight-6 Engine Could Come Back Thanks To Mercedes-Benz". autoevolution. Retrieved 2018-07-03.
  13. ↑ "The 2019 Mercedes CLS53 and E53 Bring Straight-Sixes Back to AMG". Road & Track. 2018-01-15. Retrieved 2018-07-03.
  14. ↑ "Hot Hybrids: Mercedes Launches Electrified AMG 53 Range". Motor1.com. Retrieved 2018-07-03.
  15. ↑ "630bhp Mercedes-AMG GT 4-door Coupé: Edition 1 version confirmed | Autocar". www.autocar.co.uk. Retrieved 2018-07-03.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.