| 词条 | BMW N47 | |||||||||||||||||||||||||||||||||||||||||
| 释义 |
|image= |manufacturer=BMW |production=2007-present |predecessor=BMW M47 |successor=BMW B47 |configuration=Straight-4 Diesel |engine=2.0 L (1995 cc/121 in³) }} BMW N47 is a four-cylinder common rail diesel engine that has many improvements over its predecessor, the M47. In 2014 it was replaced with the B47. First useThe N47 engine debuted in March 2007 in the facelifted 1 Series BMW E87 and E81 and was available in the 1 Series BMW E82 and E88, which were introduced later in the same year. Usage in other modelsThe engine also became available in the 5 Series BMW E60 and E61 from September 2007, several months after the 5 series was face lifted, during which time the older M47 remained available. In the 2008 model year 3 Series E90/E91/E92/E93 when the entire 3 series range gained the company's Efficient Dynamics technology. Not long after it became available in the X3 and has since then become available in the X1. The N47 comes as a 1598 cc (D16) and 1995 cc (D20) unit, the latter identical in capacity to the BMW M47TU/TU2 series. {{convert|115|bhp|kW PS|0|abbr=on}} versionThe {{convert|115|bhp|kW PS|0|abbr=on}} tune is for the entry level E81 and E87 116d, as well as the entry level 3 Series E90 316d. {{convert|143|bhp|kW PS|0|abbr=on}} versionThe {{convert|143|bhp|kW PS|0|abbr=on}} model was used in the
{{convert|163|bhp|kW PS|0|abbr=on}} versionA new {{convert|163|bhp|kW PS|0|abbr=on}} {{convert|265|lbft|Nm|0|abbr=on}} derivative was introduced in September 2009 for the 2010 model year. This version featured exceptionally low CO2 emissions of only 109 g/km and fuel consumption of 68.9 mpg{{clarifyme|us or imperial gallon?|date=July 2018}}[1] This version was used in the E90 BMW 320d Efficient Dynamics {{convert|177|bhp|kW PS|0|abbr=on}} versionThe "standard" x20d model has 14 extra bhp, at {{convert|177|bhp|kW PS|0|abbr=on}} but {{convert|7|lbft|Nm|0|abbr=on}} of torque less at {{convert|258|lbft|abbr=on}}. This is found in the
In Europe, this particular version is one of the most popular engines in the entire range; the best selling 3 series is the 320d, while the 520d is the UK's best selling 5 series.[2] The updated version of this engine introduced in March 2010 produces {{convert|135|kW|PS hp|0|abbr=on}} at 4000 rpm and {{convert|380|Nm|lb·ft|0|abbr=on}} at 1750-2750 rpm. Twin turbo versionIn October 2007, BMW introduced a twin sequential turbo model. With {{convert|204|bhp|kW PS|0|abbr=on}}, it is the first production diesel on sale to achieve a specific output of over {{convert|100|bhp|kW PS|0|abbr=on}} per liter. It uses the same turbo technology first shown in the E60 535d. This engine is on sale in the E81/E82/E87/E88 123d and the E84 X1 xDrive 23d. This is the engine which won the International Engine of the Year Award 2010. Variants
Timing chain problemsThe N47 engine family is prone to excessive timing chain wear and premature failure.[3] Rattling noise from the rear of the engine is indicative of the condition. Timing chain failure may call for engine replacement or a costly repair. The most seriously affected units which require the most extensive repairs were produced from 01.03.2007 to 05.01.2009.[4] However there have been frequent reports of timing chain failure in 1, 3 and 5 series BMW engines manufactured from as early as 2004 until at least 2011 in both the petrol and diesel versions (and hence not just necessarily in the N47 engine). At times the failure has resulted in a dangerous cut out of the engine while the vehicle was being driven - sometimes at relatively high speed. A “Quality Enhancement” was issued by BMW for some, but not all vehicles, but has since been discontinued. Other issuesThe return spring on the turbo's waste-gate was not originally lubricated or covered, this frequently resulted in early failure causing the waste-gate to remain partially or fully open. With the subsequent loss in compression, fuel consumption increased by 30%-50%. The problem was described by BMW engineers as a "known fault" and was immediately repaired (BMW mobile engineers even carried boxes of an improved spring), however BMW refused to compensate customers for the excessive fuel consumption and denied this fault was their liability.{{citation needed |date= January 2017}} References1. ^{{cite web|url=http://www.egmcartech.com/2009/08/21/bmw-320d-efficientdynamics-edition-coming-to-frankfurt-with-57-mpg/ |title=BMW 320d EfficientDynamics Edition coming to Frankfurt with 57 mpg |publisher=egmCarTech |date=2009-08-21 |accessdate=2010-09-13}} 2. ^{{cite web|url=http://www.fleetnews.co.uk/roadtests/story/index_print.asp?rtID=45251 |title=BMW 520d SE |publisher=FleetNews |date=2007-10-17 |accessdate=2017-12-13}} 3. ^{{cite web|url=http://www.honestjohn.co.uk/carbycar/bmw/1-series-e81e87-2004/ |title=BMW 1 Series E81/E87 2004 - Car Review |publisher=Honest John |date= |accessdate=2011-10-23}} 4. ^{{cite web|url=http://www.bbc.co.uk/programmes/b006mg74/features/bmw-chains-snap-n47-engine-2007-2009 |title=BBC One - Watchdog - BMW deny engine failures are due to manufacturing fault|publisher=Bbc.co.uk |date= |accessdate=2017-01-23}} External links
2 : BMW engines|Diesel engines by model |
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