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The M51 is a water-cooled and turbocharged inline six-cylinder diesel engine with a Bosch VP37-swirl-chamber-injection. [1] [2] [3] The displacement is 2.5 L; 152.4 cu in (2,497 cc) and the compression ratio is 22.0:1. Some engine variants have an intercooler in addition to the turbocharger, they can be identified by the tds. [2]
BMW is well known for its history of inline-six (straight-six) engines, a layout it continues to use to this day despite most other manufacturers switching to a V6 layout. . The more common inline-four and V8 layouts are also produced by BMW, and at times the company has produced inline-three, V10 and V12 engines, BMW also engineered non-production customised engines especially for motorsports ...
The BMW M21 is a straight-six diesel engine developed by the German engine manufacturer BMW. It has swirl chamber injection and is based on the M20 petrol engine [1] and was produced for BMW by the Upper Austrian Steyr engine plant from 1983 to 1991. It was succeeded by the M51. [2]
In 1998, its successor the BMW M57 was introduced in the 530d model, however the BMW M51 engine continued to be used for two more years in the 525td and 525tds models. In 1999, the M47 four-cylinder turbo-diesel was introduced in the 520d model, which is the only E39 model to use a four-cylinder engine.
It was powered by the BMW M50 engine and was the first 5 Series to use a rack and pinion steering system. There are two versions of the E34 530i: an inline-six model produced from 1988 to 1990, and a V8 model produced from 1993 to 1995. The earlier model was one of the last applications of the BMW M30 inline-six engine.
This was BMW's first engine to use variable valve timing. [2] Called single VANOS by BMW, the system adjusted the phasing of the intake camshaft. [3] The M50 began to be phased out following the introduction of the M52 engine in 1994. The E36 M3 is powered by the S50 engine series, which is a high output version of the M50.
From 1996 to 2001, the 318i model used a 1.9 litre version of the M44 engine. Then from 2001, the 318i model used 2.0 litre engines. Since 2015, the 318i model has used a 1.5 litre turbocharged engine. Since 1995, various models using a 2.5 litre six-cylinder engine have been named 323i and 523i.
The BMW M52 is a straight-6 DOHC petrol engine which was produced from 1994 to 2000. It was released in the E36 320i, [ 1 ] to replace the M50 . The BMW S52 engine is a high performance variant of the M52 which powered the American and Canadian market E36 M3 from 1996 to 1999.