The M278 is derived from the company's previous M273 V8 engine, sharing its bore pitch, aluminum engine block, and Silitec aluminum/silicon low-friction cylinder liners. In contrast to the naturally aspirated M273, however, the M278 features twin turbochargers, one per cylinder bank, producing up to 0.9 bar boost pressure. The M278 also features gasoline direct injection, with piezo-electrically actuated fuel injectors for more precise fuel delivery, and multi-spark ignition, which enables the spark plugs to be fired multiple times over the combustion sequence for more efficient combustion. Other changes relative to the M273 include an increased adjustment range for the variable valve timing system, a new timing chain arrangement, and new engine accessories (such as the oil pump, water pump, fuel pump, and alternator) which reduce parasitic loads. Many of these new features are shared with the M276 V6 engine family, which was announced at the same time.
2012 Mercedes-Benz E550
2012 Mercedes Benz SLK cars
Mercedes-Benz estimate that these changes, in conjunction with vehicle modifications such as a stop-start system, allow the 4.7 liter M278 to have 22% lower fuel consumption and CO2 emissions than the 5.5 liter M273 while producing more power (429 hp versus 382 hp) and torque (516 ft·lbf versus 391 ft·lbf).
2012 Mercedes Benz SLK cars
The entire M278 lineup avoids the United States Gas Guzzler Tax, a first for V8 production engines from Mercedes-Benz.
2012 Mercedes Benz C Class
The basic M278 has a displacement of 4.7 liters (4663 cc) with a bore of 92.9 mm and stroke of 86 mm. Output is 429 hp (320 kW, 435 PS) at 5250 rpm with 516 ft·lbf (700 N·m) of torque at 1800-3500 rpm for S-Class and CL-Class models, while CLS-Class models are derated to 402 hp (300 kW) with 443 ft·lbf (600 N·m) of torque at 1600 rpm.
2012 Mercedes S-Class
2012 Mercedes-Benz E350
The second variant, designated M157, is tuned by Mercedes-AMG for use in higher-performance models. This version has a displacement of 5.5 liters (5461 cc) with a bore of 98.0 mm and stroke of 90.5 mm. Increased power and torque comes from the increased displacement as well as higher boost pressure of 1.0 bar. Output is 536 hp (400 kW, 544 PS) at 5500 rpm with 590 ft·lbf (800 N·m) of torque at 2000-4500 rpm, or 563 hp (420 kW, 571 PS) at 5500 rpm with 664 ft·lbf (900 N·m) of torque at 2500-3750 rpm with the optional AMG Performance Package. The M157 engine in high-performance E-Class and CLS-Class models will produce 525 hp (386 kW) and 516 ft·lbf (700 N·m) of torque, or 557 hp (410 kW) and 590 ft·lbf (800 N·m) of torque with the AMG Performance Package. These engines are mated to the AMG Speedshift MCT 7-speed dual-clutch transmission.
Renderings: 2012 Mercedes Benz
Preview: 2012 Mercedes Benz
Review: 2012 Mercedes Benz SL
The M157 engine will replace the previous M156 in most of the AMG lineup. Despite the 5.5 liter displacement, all models are designated "63" for marketing purposes.
2012 Mercedes-Benz ML-Class
Renderings: 2012 Mercedes Benz
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 variable displacement system for improved fuel economy (up to 30 percent better than the M113 E55 engine used in the previous model). Output is 415 hp at 6800 rpm, with 390 ft·lbf of torque at 4500 rpm.
Mercedes-Benz used the 2011
Mercedes benz a class 2012
2012 Mercedes Benz CLS
Mercedes 2012
2012 Mercedes-Benz C-Class
2012 Mercedes-Benz E550
2012 Mercedes Benz SLK cars
Mercedes-Benz estimate that these changes, in conjunction with vehicle modifications such as a stop-start system, allow the 4.7 liter M278 to have 22% lower fuel consumption and CO2 emissions than the 5.5 liter M273 while producing more power (429 hp versus 382 hp) and torque (516 ft·lbf versus 391 ft·lbf).
2012 Mercedes Benz SLK cars
The entire M278 lineup avoids the United States Gas Guzzler Tax, a first for V8 production engines from Mercedes-Benz.
2012 Mercedes Benz C Class
The basic M278 has a displacement of 4.7 liters (4663 cc) with a bore of 92.9 mm and stroke of 86 mm. Output is 429 hp (320 kW, 435 PS) at 5250 rpm with 516 ft·lbf (700 N·m) of torque at 1800-3500 rpm for S-Class and CL-Class models, while CLS-Class models are derated to 402 hp (300 kW) with 443 ft·lbf (600 N·m) of torque at 1600 rpm.
2012 Mercedes S-Class
2012 Mercedes-Benz E350
The second variant, designated M157, is tuned by Mercedes-AMG for use in higher-performance models. This version has a displacement of 5.5 liters (5461 cc) with a bore of 98.0 mm and stroke of 90.5 mm. Increased power and torque comes from the increased displacement as well as higher boost pressure of 1.0 bar. Output is 536 hp (400 kW, 544 PS) at 5500 rpm with 590 ft·lbf (800 N·m) of torque at 2000-4500 rpm, or 563 hp (420 kW, 571 PS) at 5500 rpm with 664 ft·lbf (900 N·m) of torque at 2500-3750 rpm with the optional AMG Performance Package. The M157 engine in high-performance E-Class and CLS-Class models will produce 525 hp (386 kW) and 516 ft·lbf (700 N·m) of torque, or 557 hp (410 kW) and 590 ft·lbf (800 N·m) of torque with the AMG Performance Package. These engines are mated to the AMG Speedshift MCT 7-speed dual-clutch transmission.
Renderings: 2012 Mercedes Benz
Preview: 2012 Mercedes Benz
Review: 2012 Mercedes Benz SL
The M157 engine will replace the previous M156 in most of the AMG lineup. Despite the 5.5 liter displacement, all models are designated "63" for marketing purposes.
2012 Mercedes-Benz ML-Class
Renderings: 2012 Mercedes Benz
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 variable displacement system for improved fuel economy (up to 30 percent better than the M113 E55 engine used in the previous model). Output is 415 hp at 6800 rpm, with 390 ft·lbf of torque at 4500 rpm.
Mercedes-Benz used the 2011
Mercedes benz a class 2012
2012 Mercedes Benz CLS
Mercedes 2012
2012 Mercedes-Benz C-Class
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