BMW N53
{{Infobox automobile engine
|name = BMW N53 engine
|image = 530i_Touring_Msport_LCI_59.JPG
|production = 2006–2013
|configuration = Straight-6
|block = Magnesium-Aluminium
|head = Aluminium
|fueltype = Petrol
|displacement = {{convert|2497|cc|cuin|0|abbr=on|lk=on}}
{{convert|2996|cc|cuin|0|abbr=on|lk=on}}
| bore = {{convert|82|mm|abbr=on}}
{{convert|85|mm|abbr=on}}
| stroke = {{convert|78.8|mm|abbr=on}}
{{convert|88|mm|abbr=on}}
|predecessor = BMW N52
|successor = BMW N54
}}
The BMW N53 is a naturally aspirated straight-6 petrol engine which was produced from 2006 to 2013. The N53 replaced the BMW N52 in certain markets and debuted on the post-facelift E60 5 Series.
In European markets, the N53 began to replace its port injected parent, the BMW N52 in 2007. Markets such as the United States, Canada, Australia and Malaysia retained the N52 as the N53 was deemed unsuitable due to the high sulphur content of local fuel.{{cite web|title=BMW's N52 versus N53 - what are we missing?|url=http://paultan.org/2010/05/11/bmws-n52-versus-n53-what-are-we-missing|website=paultan.org}}
The N52 and N53 are the last naturally aspirated straight-six engines produced by BMW, ending a history of continuous production of this engine configuration since the BMW M30 in 1968. In 2011, the N52 began to be replaced by the BMW N20 turbocharged four-cylinder engine. N53 production ceased in 2013.
There is no BMW M version of the N53. The BMW N54 turbocharged straight-6 engine was produced alongside the N53.
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Design
File:BMW-N52 DetailVanos.jpg engine]]
Compared with its N52 predecessor which was port-injected, the N53 uses direct injection. The direct injection system uses piezoelectric fuel injectors which inject into the combustion chamber, using a stratified lean mixture operation.{{Cite web |url=http://metric.or.kr/Common/download/download_file.asp?dpath=thesis&fname=car-j-1906-0082.pdf |title=Metric.or.kr |access-date=2012-08-05 |archive-date=2019-09-29 |archive-url=https://web.archive.org/web/20190929103006/http://metric.or.kr/Common/download/download_file.asp%3Fdpath%3Dthesis%26fname%3Dcar-j-1906-0082.pdf |url-status=dead }} The compression ratio was increased to 12.0:1 for the N53.
As per the N52, the N53 has double-VANOS (variable valve timing) and a magnesium alloy block.{{cite web|title=BMW N53B25 Engine|url=http://mywikimotors.com/n53b25/|website=www.mywikimotors.com|date=8 March 2015 |accessdate=24 November 2017}} Unlike the N52, the N53 does not have Valvetronic (variable valve lift), due to space limitations in the cylinder head.{{cite web|url=http://www.bmwinformation.com/engines/straight6_n.html|title=BMW Straight 6 Engine - N Series |website=BMWInformation.com|archiveurl= https://web.archive.org/web/20080421234931/http://www.bmwinformation.com/engines/straight6_n.html| archivedate= 21 April 2008}}{{cite web|title=Engine specifications for N53 engines|url=http://www.bmwheaven.com/database/engine.php?type=N53|website=www.bmwheaven.com}}
The bore of {{convert|85|mm|in|2|abbr=on}} and stroke of {{convert|88|mm|in|2|abbr=on}} are the same as the N52. Each cylinder has coil-on-plug ignition, as per the N52.{{cite web|title=6' E63 LCI 630i Ignition coil/spark plug|url=http://www.realoem.com/bmw/en/showparts?id=EA31-EUR-11-2007-E63N-BMW-630i&diagId=12_1417|website=www.realoem.com|accessdate=30 November 2017}}
Versions
| class="wikitable sortable" style="text-align: center;" | ||||
| Engine Code | Displacement | Power | Torque | Years |
|---|---|---|---|---|
| N53B25 | {{convert|2497|cc|cuin|1|abbr=on}} | {{convert|140|kW|bhp|0|abbr=on}} at 6,100 rpm | {{convert|235|Nm|lbft|0|abbr=on}} at 3,500-5,000 rpm | 2006-2010 |
| rowspan=4|N53B30 | rowspan=4|{{convert|2996|cc|cuin|abbr=on|1}} | {{convert|150|kW|bhp|0|abbr=on}} at 6,100 rpm | {{convert|270|Nm|lbft|0|abbr=on}} at 1,500-4,250 rpm | 2009-2011 |
| {{convert|160|kW|bhp|0|abbr=on}} at 6,100 rpm | {{convert|270|Nm|lbft|0|abbr=on}} at 2,400-4,200 rpm | 2007-2013 | ||
| {{convert|190|kW|bhp|0|abbr=on}} at 6,600 rpm | {{convert|310|Nm|lbft|0|abbr=on}} at 2,600-5,000 rpm | 2009-2011 | ||
| {{convert|200|kW|bhp|0|abbr=on}} at 6,700 rpm | {{convert|320|Nm|lbft|0|abbr=on}} at 2,750-3,000 rpm | 2007-2013 |
= N53B25 =
= N53B30 (150 kW) =
A {{convert|150|kW|bhp|0|abbr=on}} version of the N53 was used in the pre-facelift F10 523i.
- 2009-2011 F10/F11 523i
= N53B30 (160 kW) =
This {{convert|3.0|L|cuin|0|abbr=on}} version of the N53 produces {{convert|160|kW|bhp|0|abbr=on}}, the same figure as the {{convert|2.5|L|cuin|0|abbr=on}} version of its N52 predecessor. However, peak torque increased from {{convert|250|to|270|Nm|lbft|0|abbr=on}}.{{cite web|title=BMW E60 5 Series 525i Specs|url=http://www.ultimatespecs.com/car-specs/BMW/5095/BMW-E60-5-Series-525i.html|website=www.ultimatespecs.com|accessdate=30 November 2017}}
Applications:
- 2007-2013 E90/E91/E92/E93 325i
- 2006-2010 E60/E61 525i
= N53B30 (190 kW) =
A {{convert|190|kW|bhp|0|abbr=on}} version of the N53 was used in the pre-facelift F10 528i.{{cite web|title=2010 BMW 528i (model since mid-year 2010 for Europe ) specs review|url=http://www.automobile-catalog.com/car/2010/1198235/bmw_528i.html|website=www.automobile-catalog.com|accessdate=30 November 2017}}
Applications:
- 2009-2011 F10/F11 528i
= N53B30 (200 kW) =
The most powerful version of the N53 produces {{convert|200|kW|bhp|0|abbr=on}} of power and {{convert|320|Nm|lbft|0|abbr=on}} of torque.{{cite web|title=2007 BMW 630i Coupé specifications|url=http://www.carfolio.com/specifications/models/car/?car=161579|website=www.carfolio.com|accessdate=30 November 2017}}
Applications:
- 2007-2010 E60/E61 530i
- 2007-2010 E63 630i
- 2007-2013 E90/E91/E92/E93 330i
- 2011-2013 F10 530i
= High-Pressure Fuel Pump failures =
The N53 uses the same High-Pressure Fuel Pump (HPFP) as the BMW N54 turbocharged straight-six engine,{{cite web|title=13517616170 Exch high-pressure pump|url=http://www.realoem.com/bmw/en/partxref?id=ND71-EUR-03-2007-E60N-BMW-530i&mg=13&sg=15&diagId=13_1183&q=13517616170&series=E92|website=www.realoem.com|accessdate=28 November 2017}} which had HPFP failures leading to Lemon Law "buy backs" and legal action in the United States. The N53 engine was not sold in the United States, therefore the N53 engine was not involved with these actions.{{Cite web|url=http://www.bimmerfest.com/forums/showthread.php?t=323430 |title=What's the deal with all these Lemon/Buyback 335i's?| website=www.bimmerfest.com }}
Failures of the N53 HPFP have been reported,{{cite web|title=BMW N53B25 Engine|url=http://mywikimotors.com/n53b25/|website=www.mywikimotors.com|date=8 March 2015 |accessdate=28 November 2017}} although it is not known whether failure in the N53 is as common as the N54.
See also
References
{{reflist|30em}}
{{BMW automotive petrol engines: 2000s to 2010s}}
{{DEFAULTSORT:Bmw N53}}