The BMW N20 is a petrol engine with four cylinders arranged in line and turbo charge the car manufacturer BMW. The new engine generation was launched in January 2011. Premiere celebrated in the X1 xDrive28i as a replacement for the previously installed six-cylinder N52 and since then gradually comes in other model ranges.
The N20 engine has been developed as a component of the Efficient Dynamics concept, which is to achieve the reduction of fuel consumption and pollutant emissions in improved driving performance. Compared with the six-cylinder engines N52 and N53, which he supplement, or to replace, four cylinders are used in the N20 used. The resulting lower friction losses, which reduced engine weight and reduced engine capacity, in this concept the basis for reduced fuel consumption. The construction is based on the six-cylinder N55, which has advanced into service areas, the motors were previously reserved with eight cylinders.
In X1 xDrive28i N20 achieved compared to the N52 a weight advantage of 15 kg ( unladen weights with automatic transmission according to EU: N20 1670 kg, N52 1685 kg ) and decreased by 1.5 liter average fuel consumption in the EU test cycle ( 7.9 l to 9, 4 l).
Engine block and cylinder head are made of aluminum. The engine has two overhead camshafts and variable camshaft timing system double VANOS. The inlet side is additionally equipped with the variable Hubverstellsystem Valvetronic, which received a new actuator with integrated sensor for higher transit speeds. The use of a throttle valve is made redundant by the system, so that the throttling loss can be reduced and the response is improved. For the mixture preparation as High Precision Injection (HPI ) is called direct fuel injection used. About centrally located between the valves solenoid injectors, the fuel is transported with a maximum injection pressure of 200 bar in a beam to the spark plug, which allows more precise metering of the fuel. Due to the cooling effect of the directly injected gasoline can a higher compression can be realized. If as in the engines requires HPI N43 or N53 low sulfur gasoline, is not known.
The TwinPower Turbo has two separate inlet spirals ( twin-scroll ). The cylinders are arranged in groups with a low firing interval (240 ° for three-cylinder Grupen, 360 ° for two cylinder groups ). Is thereby at the time of Ladungswechseltotpunkts at a low pressure in the exhaust line, whereby a flushing of the combustion chamber can be achieved with air. This increases the mass flow and the compressor working further from the surge line at a higher speed and better efficiency. In addition, the residual gas content decreases in the combustion chamber, whereby the tendency to knock is reduced. TwinScroll vein are in gasoline engines usually combined with camshaft adjusters and direct to use the flushing effect can without unburnt fuel to enter the exhaust.
To further fuel economy measures of the EfficientDynamics package contribute, including Brake Energy Regeneration, Electric Power Steering and start -stop system. There is a new demand-oriented control of the oil pump and an electrically driven coolant pump, which is controlled independently of the engine speed as needed.
BMW Z4 sDrive28i *
- BMW Z4 ( E89 ) sDrive18i, since 03 /2013
- BMW 320i (F30 ), since 03 /2012
- BMW 520i (F10 ), since 09 /2011
- BMW X1 sDrive20i/xDrive20i (E84), since 09 /2011
- BMW X3 xDrive20i (F25 ), since 09 /2011
- BMW Z4 ( E89 ) sDrive20i, since 09 /2011
- BMW 125i (F20 ), since 03 /2012
- BMW 125i with BMW M Performance Power Kit (F20 ), since 10/2013
- BMW 328i (F30 ), since 10/2011
- BMW 528i (F10 ), since 09 /2011
- BMW X1 xDrive28i (E84), since 03 /2011
- BMW X3 xDrive28i (F25 ), since 11/2011
- BMW Z4 ( E89 ) sDrive28i, since 09 /2011