BMW N53

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BMW N53 engine
530i Touring Msport LCI 59.JPG
Overview
Manufacturer BMW, Bayerische Motoren Werke AG
Production 2007–2014
Combustion chamber
Configuration Straight 6
Chronology
Predecessor BMW N52
Successor BMW N20, BMW N55

The BMW N53 is a straight 6 DOHC piston engine which was produced from 2006 to 2011. It is the final naturally aspirated straight-6 engine produced by BMW, ending a history of continuous production of this engine configuration since 1968. The N53 released in 2006 in the facelifted E60/E61 523i and 525i. Following the introduction of the N20 turbocharged straight-4 engine in 2011, the N53 began to be phased out. The N54 turbocharged straight-6 engine was produced alongside the N53, therefore the N54 took over as the highest performance six-cylinder engine.

Compared with its N52 predecessor which was port-injected, the N53 uses direct injection (consisting of Piëzo-electric injectors directly in the cylinder) with a stratified lean mixture operation.[1] The N53 has variable valve timing on both camshafts(called double vanos by BMW) and a magnesium alloy block.[2] Unlike the N52, the N53 does not contain variable valve lift (called valvetronic by BMW), due to space limitations in the cylinder head.[3][4]

BMW never sold the N53 engine in North American, Australian and Malaysian vehicles, due to the high sulphur content of the fuel available in these markets.[5] These regions continued to use the N52 port-injected naturally-aspirated and N54 direct-injection twin-turbo inline-6 engines for the 2007-2011 model years.

Models[edit]

Engine Code Displacement Power Torque Bore Stroke CR Year
N53B25-U0 2,497 cc (152 cu in) 140 kW (190 hp) @ 6100 rpm 235 N·m (173 lb·ft) @ 3500-5000 rpm 82.0 78.8 12.0 2007
N53B30 2,996 cc (183 cu in) 150 kW (200 hp) @ 6700 rpm 270 N·m (200 lb·ft) @ 1500-4250 rpm 85.0 88.0 12.0 2010
N53B30-U0 160 kW (210 hp) @ 6100 rpm 270 N·m (200 lb·ft) @ 2400-4200 rpm 85.0 88.0 12.0 2007
N53B30 200 kW (270 hp) @ 6100 rpm 310 N·m (230 lb·ft) @ 1600-4250 rpm 85.0 88.0 12.0 2010
N53B30-O0 200 kW (270 hp) @ 6700 rpm 320 N·m (240 lb·ft) @ 2750-3000 rpm 85.0 88.0 12.0 2007

N53B25-U0[edit]

The 2.5-litre N53B25-U0 is used in the E60/E61 523i [6] and produces 140 kW and 235 Nm.[4]

Applications:

N53B30-U0[edit]

The E90/E91/E92 325i switched from the 2.5 litre N52 to the 3.0 litre N53B30-U0 in March 2007. Despite the increased displacement, the maximum power remained unchanged at 160 kW.[4]

Applications:

N53B30-O0[edit]

The N53B30-O0 increased power to 200 kW (270 hp) and torque to 320 N·m (240 lb·ft).[4]

Applications:

See also[edit]

References[edit]