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 2007 to 2011. It was released in 2007 in the facelifted BMW 5 Series (E60/E61) and the BMW 3 Series (E90/E91/E92/E93). 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][2]

The N53 has variable valve timing (called double vanos by BMW). 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 used 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

The N53 was replaced by the N55 straight-6 and N20 straight-4 engines, both being direct-injection and with single twin-scroll turbochargers.

Models

Engine CodeDisplacementPowerTorqueBoreStrokeCompressionYear
N53B25-U02,497 cc (152 cu in)140 kW (190 hp) @ 6100 rpm235 N·m (173 lb·ft) @ 3500-5000 rpm82.078.812.0:12007
N53B302,996 cc (183 cu in) 150 kW (204 hp) @ 6700 rpm270 N·m (200 lb·ft) @ 1500-4250 rpm85.088.012.0:12010
N53B30-U0 160 kW (218 hp) @ 6100 rpm270 N·m (200 lb·ft) @ 2400-4200 rpm85.088.012.0:12007
N53B30 200 kW (272 hp) @ 6100 rpm310 N·m (230 lb·ft) @ 1600-4250 rpm85.088.012.0:12010
N53B30-O0 200 kW (272 hp) @ 6700 rpm320 N·m (240 lb·ft) @ 2750-3000 rpm85.088.012.0:12007

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:

N53B30-U0

The E90/E91/E92 325i switched from the 2.5 litre N52 to the 3.0 litre N53B30-U0 in September 2007 (March 2007 for the E93). Despite the increased displacement, the maximum power remained unchanged at 160 kW,[4] and maximum torque has increased just enough to compensate for a longer differential final drive ratio as a result of a shorter useful range (maximum power is given in the N53B30-U0 at only 640 rad/s instead of the 700 rad/s of the older N52B25-OL).

Applications:

N53B30-O0

The N53B30-O0 has improved maximum power to 200kW (272 PS) as well as maximum torque over the N52B30. The N53B30-O0 can be found in the 330i (E90/E91/E92/E93) and 530i (E60/E61).[4]

Applications:

See also

References

  1. ↑ "WDS Wiring Diagram System". Wds.spaghetticoder.org. Retrieved 2012-08-05.
  2. ↑ http://metric.or.kr/Common/download/download_file.asp?dpath=thesis&fname=car-j-1906-0082.pdf
  3. ↑ "BMW Straight 6 Engine - N Series". BMWInformation.com. 2007. Archived from the original on 21 April 2008. Retrieved 2008-05-20.
  4. ↑ 4.0 4.1 4.2 4.3 "BMW Heaven Specification Database | Engine specifications for N53 engines". Bmwheaven.com. Retrieved 2012-08-05.
  5. ↑ http://paultan.org/2010/05/11/bmws-n52-versus-n53-what-are-we-missing/
  6. ↑ "BMW Engine Codes". 2007. Retrieved 2008-05-20.