Mercedes-AMG has officially introduced a 4-cylinder turbocharged engine in line with the new 2.0L capacity with the code name M139 strong to 420 horsepower and 500Nm.
Previously, in 2014, Mitsubishi had limited production of 40 Lancer Evolution FX-440 MR in the UK with a powerful 2.0L I4 I4 engine. Therefore, M139 at the present time is considered the most powerful commercial 2.0L I4 engine in the world. Mercedes-Benz representatives also said that this engine will soon appear on its small high-performance cars, including Mercedes-AMG A45, CLA 45 and GLB 45.
Engine block M139 is equipped with twin-scroll turbocharger with air-to-water intercooler. There will be 2 levels of output corresponding to the Standard and S versions. In particular, the turbocharger in the M139 Standard version can generate a maximum pressure of 27.6 psi (1.9 bar). The maximum capacity at this time is 382 hp at 6,500 rpm and the maximum torque reaches 480 Nm in the range of 4,750 to 5,000 rpm.
In version S, the highest pressure in the turbocharger is up to 30.5 psi (2.1 bar). Maximum capacity thus achieved 420 hp at 6,750 rpm and maximum torque of 500Nm in the 5,000 to 5,250 rpm rpm range. In addition, both engine versions are braked by the high-performance upgrade company of Mercedes-Benz (redline) at 7,200 rpm.
Overall, M139 weighs 160.5kg with body and piston made of aluminum alloy, which helps to reduce weight and increase the durability of the engine. The cylinder and piston stroke dimensions are 83mm and 92mm respectively. One notable point is that the fuel system of this engine is applied simultaneously with 2 types of injection, direct injection (direct injection) and indirect injection (indirect injection).
Regarding the gas distribution system, Mercedes-AMG engineers use a double camshaft system with 16 valves (4 valves per cylinder). Both intake and exhaust valves are controlled by variable valve technology to change the aperture more or less depending on operating conditions. In addition, the exhaust line adds Camtronic technology to control the valve opening time to optimize the engine’s fuel combustion efficiency.