Municipal policy

Municipal policy

Munchen, 8. August 2014 – with the UKL platform for the Mini, which came at the beginning of the year and the BMW 2er Active Tourer launching in September comes a new generation of gasoline engines with the short B38 (for three-cylinder) B48 (four-cylinder) on the strain. Father is still a six-cylinder appearing on the same basis. The new engines use a heavily unified so-called "construction kit". This refers to a high proportion of shares. The fact that this principle has also extended to the self-cunning, some of which lies on the hand after the zound prints in the gasoline engine are now approaching the diesel. The municipality (ie "equality") is still around the half. Nevertheless, it should first be about the gasoline motors.

"Strongly unified" – not "greatly simplified"

Consistent and even higher power must come from even smaller clamps with further lowered speeds in order to increase efficiency and reduce the exhaust values. Both are owed the continued prescribed legal requirements. At the same time, the challenges of customers increase performance, response, running culture and excavation comfort. Example Charging: For modern downsizing turbochargers are indispensable – a turbochool but no one accepts more. The high demands from both directions are lacking that BMW also equips its new engines with full-variable valve control (Valvetronic) as well as direct injection. To connect all the level further increased, leading to a unobstructed constructive effort. "Strongly unified" means not at nocludes "greatly simplified".

At the traditional cylinder center distance of 91 millimeters, BMW nothing else, because the maximum single hub of uniformly 500 cubic centimeters are not growing. In the 1.2 liter small entry-level motor B38A12 (with the "12" as a displacement note) of the Mini One, it was reduced to 400 cubic centimeters. The cylinder sizes are thus in a thermodynamic and tribological optimum – significantly larger or smaller units had a worse efficiency.

The bore-hub ratio was also subordinate to 1.15 for all variants, including the 1.2-liter engine, the optimum between combustion efficiency and friction reduction. This mild long-betrayer demands the torque in the lower speed range and stores in the upper, because the highest performance already from 4500 / min or. 4700 / min for three-respective four-cylinder with a specific power of 66.7 or. 70.5 kW / L drops. Your highest torques of 220 or. 280 Nm reach these motors already at 1250 / min.

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