Mercedes-Benz M139 engine

Mercedes-Benz M139
Overview
Manufacturer	Mercedes-AMG
Production	2019-present
Layout
Configuration	Straight-four engine
Displacement	2.0 L (1,991 cc)
Cylinder bore	83 mm (3.27 in)
Piston stroke	92 mm (3.62 in)
Cylinder block material	Aluminium alloy
Cylinder head material	Aluminium alloy
Valvetrain	DOHC
Compression ratio	9.0:1
Combustion
Turbocharger	One twin-scroll, electrically assisted
Fuel system	Combined Direct and Port Fuel Injection
Fuel type	Gasoline
Output
Power output	285 kW (387 PS; 382 hp) base version 310 kW (421 PS; 416 hp) S-model
Torque output	480 N⋅m (354 lb⋅ft) (base version) 500 N⋅m (369 lb⋅ft) (S-model)
Dimensions
Dry weight	160.5 kg (354 lb)
Chronology
Predecessor	Mercedes-Benz M133 engine

The M139 is a turbocharged straight-four engine produced by Mercedes-Benz. It is the successor of the M133 engine. It is also the first four-cylinder engine by AMG to be specified with two outputs, assembled by hand using "one man, one engine" philosophy, and equipped with combined a port and direct fuel injection system. At 310 kW (416 hp) on its introduction, M139 was the world's most powerful four-cylinder engine in serial production with specific output of 155 kW (208 hp) per litre or 78 kW (104 hp) per cylinder.^[1][2] The current top trim of the M139 produces 350 kW (469 hp), giving it a specific output of 175 kW (235 hp) per litre or 87.5 kW (117 hp) per cylinder, making it the current most powerful four-cylinder engine in serial production.