The new BMW M3 and M4 saloons have been revealed in full.
The BMW M3 returns as a saloon only and with turbocharged six-cylinder power for the very first time. The adoption of turbo power dispenses with 26 years of BMW M division tradition of using high-revving naturally aspirated engines for the M3.
Pictured here in production car guise for the first time, the new 425bhp four-door M3 saloon will be joined from the outset of sales in 2014 by the M4, a mechanically identical but stylistically sleeker two-door coupé previewed in lightly veiled concept car guise at the Pebble Beach concours in California in August. The new M3 saloon and M4 coupé will be unveiled at the Detroit show next month.
The brand has previously revealed a potent twin-turbocharged 3.0-litre direct-injection petrol unit that produces an official 424bhp at 7500rpm.
The newly developed engine, known under the internal codename S55 B30, shares its 84.0mm bore and 89.6mm stroke with BMW’s standard turbocharged 3.0-litre in-line six-cylinder direct injection petrol mill, the M55. That engine is used across the German manufacturer's line-up, endowing the aluminium block unit with an overall swept volume of 2979cc.
This represents a sizeable 990cc reduction on the engine BMW’s M division’s new unit replaces, the S65. Continued..
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