Just a few weeks before the most waited automotive event of the year, the 2013 Geneva Motor Show, Mercedes-Benz dropped a bombshell, in the name of the A45 AMG. That’s a normal A-Class, that comes with a 2.0l turbocharged 4 cylinder engine that develops 360hp and 450Nm at 1.8bar of boost pressure, an AWD system (5th generation Haldex) and enhanced looks.
As it’s supposed to be a direct competitor to the M135i and the upcoming RS3, the M133 engine is currently the most powerful four cylinder engine in production in the world, developing a maximum output of 265 kW (360 hp) and up to 450 Newton metres of torque. That’s a stunning 181hp per litre of displacement! Coming under the BlueDIRECT family of engines, the M133 features spray-guided direct petrol injection via piezo injectors positioned centrally in the four combustion chambers, as well as a gravity-die sandcast all-aluminium crankcase, weight-optimised crank assembly with forged steel crankshaft and forged pistons with friction-optimised piston rings, NANOSLIDE cylinder wall technology, air-water charge air cooling, generator management and ECO start/stop function. This combination improves fuel utilisation and increases thermodynamic efficiency substantially, leading to lower exhaust emissions.
The issue with the throttle response, or lag, with the high-boosted turbocharged engines, is resolved by using a twin-scroll turbocharger, aiming for a maximum derestriction of the exhaust system and implementing an innovative injection strategy. Finally, the, familiar from the SLK55, exhaust system features large pipe cross-sections and an automatically controlled exhaust flap. As far as the engine cooling is concerned, a low-temperature circuit is additionally deployed for air-water charge air cooling, coming straight from the SLS. Cooling of the transmission oil is integrated in the water cooling circuit for the engine.
The familiar AMG SPEEDSHIFT DCT 7-speed sports transmission is directly flange-mounted on the transversely installed M133 engine, featuring a dual clutch, seven gears, three driving programmes, a double-declutching function and a launch control function. The 4MATIC all-wheel drive comes as standard. According to MB: “The power flux to the rear powertrain is provided by a compact power take-off unit (PTU) which is fully integrated in the 7-speed sports transmission. It does not possess an oil circuit of its own. Instead, it is supplied with lubricant from the oil circuit of the sports transmission”.
For more details, please visit our official thread (here) or click more, to read the complete press release and see our photo gallery!
Source: [Daimler AG]
Posted in: Mercedes-Benz