Mercedes-Benz M139 engine

The M139 is a successor of M133, a turbocharged inline-four engine produced by Mercedes-Benz, for the next generation A45 AMG and A45 S AMG. It is also a 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), M139 is 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]

Mercedes-Benz M139
Overview
ManufacturerMercedes-Benz
Production2019-present
Layout
ConfigurationInline-four engine
Displacement2.0 L (1,991 cc)
Cylinder bore83 mm (3.27 in)
Piston stroke92 mm (3.62 in)
Block materialAluminium alloy
Head materialAluminium alloy
ValvetrainDOHC
Compression ratio9.0:1
Combustion
TurbochargerOne twin-scroll
Fuel systemCombined Direct and Port Fuel Injection
Fuel typeGasoline
Output
Power output285 kW (387 PS; 382 hp) base version and 310 kW (421 PS; 416 hp) S-model
Torque output480 N⋅m (354 lb⋅ft) base version and 500 N⋅m (369 lb⋅ft) S-model
Dimensions
Dry weight160.5 kg (354 lb)
Chronology
PredecessorMercedes-Benz M133 engine

Design

The M139 engine is based on the current Mercedes-Benz M260 engine, which i an upgraded version of the outgoing M270, sharing the same bore and stroke dimension as well as the block. Unlike the normal M260, the AMG engineers rotated the engine block 180 degrees so that the intake system is in the front of the engine while the turbochargers and exhaust headers are situated between the engine and firewall.[3] The rotation optimises the air flow for higher performance and with shorter distance and fewer diversions. This also leads to the "allows the flattest possible and aerodynamically advantageous front section design."[4] The exhaust valves in M139 engine are bigger than ones in M133 engines for higher flow. The compression ratio is raised to 9.0:1 for M139 from 8.6:1 for M133. The two-stage fuel injection system, a first in AMG four-cylinder engine, has the piezo injectors delivering the fuel directly into the combustion chambers as first stage and solenoid valves in the manifolds as second stage for increased specific output.

Performance

The M139 engine has two specific outputs: 285 kW (382 hp) and 480 N⋅m (354 lb⋅ft) for the base version; and 310 kW (416 hp) and 500 N⋅m (369 lb⋅ft) for the S-model.

Models
Engine Power Torque Years
M139 285 kW (382 hp)
at 6,500 rpm		 480 N⋅m (354 lb⋅ft)
at 4,750-5,000 rpm		 2019-
310 kW (416 hp)
at 6,750 rpm		 500 N⋅m (369 lb⋅ft)
at 5,000-5,250 rpm		 2019-

M139 (285 kW version)

M139 (310 kW version)

References
  1. Patrick George (7 June 2019). "Good Gravy: AMG Is Getting 416 Horsepower Out of Just a 2.0-Liter Turbo Four". Jalopnik.
  2. Bob Sorokanich (7 June 2019). "How Mercedes-AMG Made the Most Powerful Production Four-Cylinder Ever". Road & Track.
  3. https://www.carthrottle.com/post/mercedes-amgs-new-20-inline-four-develops-416bhp-revs-to-7200rpm/
  4. "The world's most powerful four-cylinder engine in series production, made in Affalterbach". Mercedes-Benz USA. 6 June 2019.
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