Products

Excerpt

Mercedes-AMG has installed a new 2-l turbocharged gasoline engine in the A 45 and CLA 45. The inline four-cylinder engine comes in two output variants producing a maximum of 285 kW at 6500 rpm and 480 Nm of torque (4750 to 5000 rpm) or 310 kW at 6750 rpm and 500 Nm (5000 to 5250 rpm). One special feature of the new engine is its twin-scroll turbocharger with two flow passages that run parallel to one another and compressor and turbine shafts with roller bearings to reduce mechanical friction. The electronically controlled wastegate allows the boost pressure (up to 2.1 bar) to be controlled more precisely and flexibly which improves the engine's responsiveness. In the two-stage fuel injection process, fuel is supplied directly to the combustion chambers by piezo injectors and also injected into the intake manifold using solenoid valves. The all-aluminum closed-deck crankcase with coated cylinder liners and the crank assembly, which consists of a lightweight, forged steel crankshaft and forged aluminum pistons with optimized piston rings, are designed for high performance.

…