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Twin Turbo and EfficientDynamics for 4cyl Petrol and Diesel - 4-cyl Gasoline: Introduction

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Article Index
Twin Turbo and EfficientDynamics for 4cyl Petrol and Diesel
4-cyl Gasoline: Introduction
4-cyl Gasoline: High Precision Injection
4-cyl Gasoline: Clean and Efficient
4-cyl Gasoline: Specifications
4-cyl Diesel: Introduction
4-cyl Diesel: Fuel Economy and Variable Twin Turbo
4-cyl Diesel: Specifications
All Pages
4 Cylinder Gasoline: Introduction
As a result of this new technology, the concept of High Precision Injection already introduced successfully on BMW’s straight-six power units is now available in an even larger number of models.
Making this move, BMW is consistently continuing the development strategy of EfficientDynamics, again offering modern technical solutions serving to enhance both sheer driving pleasure and motoring economy at an early point in time throughout the entire model range. In practice, BMW is therefore focusing on the growing significance of fuel-efficient power units in a particularly attractive and consistent manner.
Direct gasoline injection operating in the lean burn mode meets the latest demands of the European automobile market in terms of dynamic performance, all-round economy and emission management in an ideal manner. BMW’s new four-cylinder power units furthermore combine ultra-precise and therefore uniquely efficient High Precision Injection with numerous other technologies for enhanced fuel efficiency. These include Brake Energy Regeneration, the Auto Start Stop function, a gearshift point indicator, new electrical steering, a pressure-controlled fuel pump, and the option to disconnect the climate compressor from the engine’s belt drive.
Again reflecting the concept and philosophy of EfficientDynamics, this means a perfect combination of greater performance and optimum economy.
The new four-cylinder petrol engine displacing 2.0 litres thus offers an increase in output in its most powerful version by 15 kW or 20 hp over the previous engine. At the same time the new BMW 120i powered by this engine, to take one example, offers a reduction of fuel consumption versus its predecessor by approximately 14 per cent to 6.4 litres/100 kilometres in the EU test cycle, equal to 44.1 mpg Imp. The new BMW 118i, in turn, providing an increase in output by 10 kW or almost 14 hp, comes with a reduction of fuel consumption by approximately 19 per cent to 5.9 litres/100 kilometres, equal to 47.9 mpg Imp. And at the same time this model’s CO2 emissions are down to just 140 grams/kilometre.
Fast-revving performance, superior running smoothness, all-round economy – BMW’s new four-cylinder power units excel on all of these points, in all criteria crucial to up-to-date driving pleasure. Through their temperamental development of superior engine power, they ensure sporting performance at all times and under all conditions. And apart from dynamic performance, motoring culture is also enhanced to a level of refinement quite outstanding in this segment: In its most powerful version, the 2.0-litre four-cylinder develops maximum output of 125 kW/170 hp and peak torque of 210 Newton-metres/155 lb-ft. The second version of the new drive unit develops maximum power of 105 kW/143 hp, with torque peaking at 190 Nm/140 lb-ft. Yet a further version of the engine following at a later point in time will be a 1.6-litre four-cylinder offering maximum output of 90 kW/122 hp and peak torque of 160 Nm/118 lb-ft.
In both engine classes and in all power stages, High Precision Injection gives the new generation of four-cylinders a standard of all-round efficiency quite unique on a petrol engine.
This progress over the first generation of direct gasoline injection deliberately not used by BMW results from the central position of the piezo-injectors featured for the first time on High Precision Injection between the valves, in the immediate vicinity of the spark plug. This arrangement is indeed the prerequisite for the innovative jet-guided combustion process allowing far more precise dosage of fuel and maintenance of the lean burn mode throughout a wide operating range on the engine control map.


Significant advantages in fuel economy without compromises.
High Precision Injection was presented for the first time in BMW’s 225 kW/306 hp straight-six power unit with Twin Turbo technology featured in the BMW 335i Coupé. Initially, this new fuel injection system was focused on the specific requirements of a particularly powerful engine.
Now High Precision Injection offers an even greater potential for enhanced fuel economy on both a six- and four-cylinder in the lean burn direct injection mode. Applying this combustion concept also referred to as stratified charging, the composition of the fuel/air mixture is masterminded with particular accuracy. This means that unlike a conventional gasoline engine, such an advanced power unit no longer requires a fuel:air ratio of 1 : 14 (lambda = 1). Rather, the share of fuel in the mixture may be reduced significantly throughout a wide operating range (lambda > 1). This is possible because the piezo-injectors positioned directly next to the spark plugs offer controlled combustion in layers (stratified arrangement) over a wide operating range, with the exact composition of the fuel:air mixture varying from one layer to the other.

Significant enhancement of driving dynamics.
Benefiting from this revolutionary injection technology, BMW’s new four-cylinders are entering a new dimension of all-round economy: With High Precision Injection, fuel consumption of the already very efficient engines with variable VALVETRONIC valve management is down once again. And this further optimisation of fuel economy does not in any way detract from the engines’ dynamic performance. On the contrary – the most powerful version of the new engines outperforms the 2.0-litre four-cylinder with VALVETRONIC by a significant 15 kW/20 hp.
Through their supreme engineering performance, BMW’s engine development specialists are able to capitalise more than ever before on the savings potential of a modern petrol engine, BMW’s petrol power units thus offering a standard of fuel economy so far provided only by a diesel.
Not surprisingly, therefore, the new generation of engines ranks clearly at the top in any comparison with the competition.

Last Updated on Monday, 09 April 2007 13:58  

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