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Mercedes-AMG to use A45's 416-hp engine for RWD models

The small four-cylinder mill may be used for hybrids.

Mercedes-Benz apparently has more plans for the AMG A45's powerful four-cylinder turbocharged M139 engine.

The 2.0-liter unit is billed as the most powerful production four-cylinder ever, delivering 421 horsepower and 368 pound-feet of torque in the CLA 45 S.
Speaking to Paultan.org, AMG head Tobias Moers said the company designed the engine to deliver enough power for a wide range of configurations, "not necessarily east-west applications," seemingly confirming plans to use it in a longitudinal format for rear-wheel-drive models.
The AMG division earlier this year announced that all models will eventually be available with plug-in hybrid powertrains. The 2.0-liter engine could help offset the weight penalty associated with electric motors and batteries.
The company could also use the downsized powerplant with its 48-volt mild hybrid technology. A 48V starter/generator contributes 21 horsepower and 184 pound-feet of torque in the new GLE 53 crossover. A similar EQ Boost setup with the M139 could theoretically deliver a combined output of more than 440 horses and 550 pound-feet of torque.
Moers did not hint at which particular rear-wheel-drive models might receive the M139 engine, though the company will presumably debut new hybrids at a steady pace in the coming years.

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