Mercedes-Benz M139 engine

Mercedes-Benz M139
Overview
Manufacturer	Mercedes-AMG
Production	2019-present
Layout
Configuration	Inline-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 inline-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, to be assembled by hand using "one man, one engine" philosophy, and to be equipped with combined 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 208 hp per litre or 104 hp per cylinder.^[1][2] The current top trim of the M139 produces 350 kW (469 hp), giving it a specific output of 235 hp (175 kW) per litre or 117 hp (87.5 kW) per cylinder, making it the current most powerful four-cylinder engine in serial production.