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BMW N53
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.〔http://metric.or.kr/Common/download/download_file.asp?dpath=thesis&fname=car-j-1906-0082.pdf〕
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.
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.〔http://paultan.org/2010/05/11/bmws-n52-versus-n53-what-are-we-missing/〕 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==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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