After its worldwide success with the ingenious 507 bhp V10 powerplant (2005 Engine of the Year) and the VALVETRONIC magnesium-aluminum straight-six engines, BMW is ready to launch another star, the biturbo version of its acclaimed petrol-powered six-cylinder.
The new all-aluminum BMW Biturbo engine has a 3.0-litre capacity and boasts a pair of turbochargers that feed a trio of cylinders. Combined with the performance and flexible character of renowned VALVETRONIC and double-VANOS technology, the new BMW engine can develop an impressive 300 bhp of power and 295 lb-ft of torque.
A Table Mountain-like torque profile defies the term curve, while the 295 lb-ft peak torque is delivered between 1,500 rpm and 5,800 rpm and the red line boasted by the engine is 7,000 rpm.
The biturbo six-cylinder develops the same amount of power and even more torque than the more massive 4.0-litre V8 engine for the 740i.
Subscribing to BMW philosophy, great performance comes with care for the environment. Usually, powerful turbo engines imply huge fuel consumption, but in this case this rule does not apply. The new engine has a high-precision direct petrol injection that radically reduces fuel consumption. It is the first time BMW uses this technology for a six-cylinder engine.
BMW engineers succeeded to iron out another traditional flaw characteristic to turbo engines: the turbo lag. Because of low inertia turbochargers, the turbo lag was no more needed.
The engine delivers an electrifying response, so just brushing the accelerator pedal provides instant surge of power.
Turbocharger technology can be considers as old as the internal combustion itself, but BMW writes a new page in the history of forced-induction with combining turbochargers with innovative high-precision direct petrol injection.
The all-aluminum engine is inspired from the magnesium-aluminum 3.0-litre engine rated at 262 bhp. The new biturbo technology increases overall output by approximately 15 percent, while the peak torque has an impressive 30 percent increase. The result is the outstanding 300 bhp and 295 lb-ft of torque.
All this power and performance does not come with significantly increase in engine size. The engine weighs about 155 lbs less than an equally powerful eight-cylinder engine displacing 4.0 liters.
Compared with a similar turbocharged engine with regular fuel injection, the fuel consumption of this engine is 10% less because of its direct petrol injection.
Being made of high heat-resistant special steel, the turbines are resistant to temperatures of up to 1,050 ° C. They do not require extra air flow for cooling, so fuel consumption is also reduced.
The piezo-injector located between the valves permits exact dosage of fuel and a higher compression ratio. The central position of this ingenious injector distributes fuel in a conical burst providing appropriate distribution within the combustion chamber.
Perfect smoothness and refinement transformed BMW straight-six power units the benchmark for exquisite drive technology all over the world. This way, the engine is given perfect balance, without vibrations even at high engine speed.
This new engine demonstrates once again that BMW is one of world`s best manufacturer for intelligent, elevated and dynamic engines.