Powertrain
The smallest available petrol engine is the 1.5-litre M264 engine offered in the C 180 model (rated power 125 kW),[7] and in the C 200 model (rated power 150 kW).[7] The C 300 model is powered by a 2.0-litre M254 petrol engine rated 190 kW. The M254 is equipped with a twin-scroll "segmented" turbocharger featuring an overboost function that allows it to produce an additional 26 kW for up to 30 seconds, as well as a 48V electric supercharger that provides assist at low engine speeds.[5]
Daimler initially offers two Diesel models, the C 220d, and the C 300d. Both models are powered by the same 1992 cm3 OM654 engine, rated 147 kW in the C 220d, and 195 kW in the C 300d. Compared with the preceding Diesel engine, the OM654 has a new crankshaft that increases the stroke to 94.3 millimeters, and a water-cooled, variable turbine geometry turbocharger.[8] In July 2021, the C 200d was introduced with a detuned version of the above engine, now producing 120 kW of power and 380 Nm of torque.
Daimler has announced that it will be offering a plug-in hybrid model with a petrol engine, the C 300e, as well as a plug-in hybrid model with a diesel engine, the C 300de. The mainline C-class 4Matic models and AMG C43 continue to use permanent AWD with an open double-planetary type center differential. The two axles are linked by a pre-loaded two plate clutch with a locking action of 50nM. Two versions of Magna's Trumax open center differential transfer case are used. The non-AMG models use the version geared for a 45/55 front-to-rear torque split. AMG C43 models are offered with the more rear-biased AMG-Performance Permanent AWD, which uses a center differential geared for a 31/69 front-to-rear torque split. The AMG C63 uses the AMG-Performance 4Matic+ AWD. This system replaces the open center differential with an electronically controlled multi-disc clutch which enables stepless coupling of the front axle to the drivetrain. The rear axle is permanently driven. Drive torque distribution to the front axle is infinitely variable throughout the range of between 0 and 50% of total gearbox output torque. The plug-in hybrid models are supposed to have an all-electric range of 100 kilometres.[9]
As of April 2022, AMG offers a new engine in the C 43 4MATIC: a turbocharged 2.0-litre 4-cylinder M139 engine + 48V electric motor, rated at a combined 320 kW.
The M139 4-cylinder engine in the C 63 S E-Performance produces 350 kW, giving it a specific output of 175 kW per litre or 87.5 kW per cylinder, making it the current most powerful four-cylinder engine in serial production.
