BMW N53

BMW N53 engine
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

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

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

Applications:

• 2006-2010 E60/E61 523i

N53B30-U0

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:

• 2007-2011 E90/E91/E92/E93 325i
• 2006-2010 E60/E61 525i
• 2009-2011 F10/F11 523i
• 2009-2011 F10/F11 528i

N53B30-O0

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

Applications:

• 2007-2011 E90/E91/E92/E93 330i
• 2007-2010 E60/E61 530i
• 2010-2011 F10/F11 530i sedan

See also

• BMW N52
• BMW N54
• BMW engines
• BMW vehicles

References

1. http://metric.or.kr/Common/download/download_file.asp?dpath=thesis&fname=car-j-1906-0082.pdf
2. "BMW N53B25 Engine". mywikimotors.com.
3. "BMW Straight 6 Engine - N Series". BMWInformation.com. Archived from the original on 21 April 2008.
4. "Engine specifications for N53 engines". www.bmwheaven.com.
5. "BMW's N52 versus N53 - what are we missing?". paultan.org.
6. "BMW Engine Codes". racingdynamics.com.