Starting July next year (2015), BMW will put the new designed 4 cylinder turbon engine (code name B48) in its 320i sedan, to replace the old N20 engine; Also the new B58 six-cylinder engine will appear in the 335i too.
Compared to the current N20 engine, the new B48 four-cylinder turbo engine has a smaller bore (B48: 82mm; N20: 84mm) and longer stroke (B48: 94.6mm; N20: 90.1mm). The smaller bore/stroke ratio means this new engine is more focus on low-end torque, rather than high revving power.
The B48 engine uses piezoelectric direct injection, valvetronic, Double VANOS...
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