Mercedes-Benz M278 engine

The

The M278 is derived from the company's previous

The basic M278 has a displacement of 4,663 cc (4.7 L; 284.6 cu in) with a bore and stroke of 92.9 mm × 86 mm (3.66 in × 3.39 in). Output is 320 kW (429 bhp; 435 PS) at 5,250 rpm with 700 N⋅m (516 lb⋅ft) of torque at 1,800-3,500 rpm for S-Class, CL-Class, SL-Class, and GL-Class models.[2] CLS-Class, E-Class, and M-Class models are detuned to 300 kW (402 bhp; 408 PS) with 600 N⋅m (443 lb⋅ft) of torque at 1,600 rpm.^[5] Although it no longer corresponds with the engine displacement, all of the above models are still badged as "550". The GL-Class, besides the GL550 above, also features the GL450 trim that carries a detuned version of the 4.7 L engine making 270 kW (362 bhp; 367 PS) and 550 N⋅m (406 lb⋅ft)^[6]

For 2014 S-Class models (chassis code W222), power is increased to 335 kW (449 bhp; 455 PS) at 5,250 rpm, while torque remains at 700 N⋅m (516 lb⋅ft) between 1,800-3,500 rpm. .^[7]

These engines are mated to the

Applications:^[2]

• 2011–2017
  S 500/S 550
• 2011–2014
  CL 500/CL 550
• 2015–2017
  S 500 Coupé/S 550 Coupé
• 2011–2018
  CLS 500/CLS 550
• 2012–2020
  SL 500/SL 550
• 2012–2014
  E 500/E 550
• 2012–2014
  ML 500/ML 550
• 2013–2014
  GL 450
• 2013–2019
  GL 500/GLS 500/GL 550/GLS 550

M157 AMG

The second variant, designated M157,^[8] is tuned by Mercedes-AMG for use in higher-performance models. This version has a displacement of 5,461 cc (5.5 L) with a bore and stroke of 98 mm × 90.5 mm (3.86 in × 3.56 in).^[9] Increased power and torque comes from the increased displacement as well as higher boost pressure of 1 bar (15 psi).

There are six states of output with the M157. For the S-Class and CL-Class, power is 400 kW (544 PS; 536 bhp) at 5,500 rpm with 800 N⋅m (590 lb⋅ft) of torque at 2,000-4,500 rpm, or 420 kW (571 PS; 563 bhp) at 5,500 rpm with 900 N⋅m (664 lb⋅ft) of torque at 2,500-3,750 rpm with the optional AMG Performance Package.^[9] For the 2013-15 SL-Class, power is 395 kW (537 PS; 530 bhp) or 415 kW (564 PS; 557 bhp) with the optional AMG Performance Package. For the 2012-2013 E-Class and CLS-Class, power is 386 kW (525 PS; 518 bhp) with 700 N⋅m (516 lb⋅ft) of torque in standard tune, or 410 kW (557 PS; 550 bhp) with 800 N⋅m (590 lb⋅ft) of torque with the AMG Performance Package.^[10] Beginning with the 2014 E-Class and CLS-Class, power increases to 410 kW (557 PS; 550 bhp) 720 N⋅m (531 lb⋅ft) of torque for standard tune, or 430 kW (585 PS; 577 bhp) with 800 N⋅m (590 lb⋅ft) of torque for "S-Model" variants.^[11][12] At the same time for SL-Class, power increases to 430 kW (585 PS; 577 bhp) and 900 N⋅m (664 lb⋅ft).^{[13][14][15][16]}

These engines are mated to the

Applications:[8]

• 2011–2013
  S 63 AMG
• 2013–2017
  S 63 AMG
• 2011–2014
  CL 63 AMG
• 2012–2018
  CLS 63 AMG
• 2012–2015
  ML 63 AMG
• 2015–2019
  AMG GLE 63
• 2012–2016 GL 63 AMG
• 2016–2019 AMG GLS 63
• 2013–2018 G 63 AMG
• 2012–2016 E 63 AMG^[17]
• 2012–2019 SL 63 AMG

The M157 engine will replace the previous M156 in most of the AMG lineup. Despite the 5.5–litre displacement, all models are designated "63" for marketing purposes.^[19]

M152

The third variant, designated M152, is a naturally aspirated derivative of the M157 engine, sharing the same displacement, direct injection, and many other features. The M152 engine includes a cylinder deactivation variable displacement system for improved fuel economy^[20] (up to 30 percent better than the M113 E55 engine used in the previous model). Output is 310 kW (421 PS; 416 bhp) at 6,800 rpm, with 540 N⋅m (398 lb⋅ft) of torque at 4,500 rpm.^[21]

Applications

• 2012–2016
  SLK 55 AMG (R172)

References