According to the latest reports it appears that Bmw is currently working on a new 2.0-litre turbocharged four-cylinder powerplant, which will be introduced on the X1 crossover, Z4 coupe cabriolet and even the 5-Series later this year. Apparently, the new engine is seen as an indirect replacement for the least powerful version of the popular 3.0-litre in-line six-cylinder petrol engine.
Dubbed N20, the new engine will make its debut in the 2011 Bmw X1 xDrive28i, which will be introduced in March, at the 2011 Geneva Motor Show.
According to the manufacturer, the engine is the first one to carry the BMW TwinPower Turbo technology, and it is capable to deliver 180 kW/245 hp and 350 Nm of torque.
With these numbers, the X1 can accelerate from 0 to 100 km/h (62 mph) in just 6.1 seconds (6.5 with automatic transmission), and delivers a fuel consumption in EU test cycle of 7.9 litres/100 km or 35.7 mpg imp (an improvement of 1.5 litres / 5.7 mpg), CO2 emissions: 183 g/km (down by 38 g).
The car is offered as standard with six-speed manual transmission or optionally with eight-speed automatic, and features Auto Start-Stop function (manual transmission models).
Making a positive impact on its power development are the double-VANOS variable intake and exhaust camshaft timing plus the VALVETRONIC head-integrated fully cylinder variable valve control system. The engine even has the latest version of the VALVETRONIC system, that due to a sensor integrated to an optimized stepper motor, makes it even faster-acting. The engine even has the assembled intake and exhaust camshafts.
The use of the brand’s very own patented BMW VALVETRONIC system with its seamlessly variable intake valve lift control distributes with its throttle valve system that’s similar to the early versions of the engine. What happens instead is that the combustion air mass is regulated inside the BMW X1 xDrive28i’s engine and thus make it respond faster.
The engine is made more efficient by making sure that the pumping losses are minimized. While it is indeed a turbocharged unit, the engine has a rather high efficiency because of the petrol direct-injection High Precision Injection petrol direct-injection system.
Ensuring that the supply of fuel is controlled in a precise manner are the solenoid injectors, with their 200 bar maximum injection pressure, placed in the middle of the valves. Since the fuel is injected as near to the spark plug as possible, combustions in cleaner and more homogenous.
Unlike on the usual turbocharged engines, the injected fuel of the BMW X1 xDrive28i has a cooling effect that gives it higher compression ratio. All of these improve the efficiency even further. It also gets on-demand electric coolant pump and computer-controlled oil pump which improves efficiency.
In addition, its engine is coupled with the usual six-speed manual transmission that comes with the Auto Start-Stop function. This is the system that turns off the engine automatically especially when the vehicle is in stationary traffic or when at a red traffic light, saving on fuel.
The standard BMW EfficientDynamics gives the BMW X1 xDrive28i a good balance between fuel consumption and performance. Average fuel consumption for the BMW X1 xDrive28i has been rated by EU test cycle at 7.9 litres /100 km, or around (35.7 mpg). This figure is 16% better compared to the prior models.