page_title: BMW M30
section_title: M30B25V
hierarchical_section_title: BMW M30 / Versions / M30B25V
caption_attribution_description: For documentary purposes the German Federal Archive often retained the original image captions, which may be erroneous, biased, obsolete or politically extreme. Autowerk BMW-München Information added by Wikimedia users.Motorblöcke Sechszylinder-Reihenmotoren BMW M30 für BMW E3 und BMW E9
context_page_description: The BMW M30 is a SOHC straight-six petrol engine which was produced from 1968 to 1995. With a production run of 27 years, it is BMW's longest produced engine and was used in many car models.
  The first models to use the M30 engine were the BMW 2500 and 2800 sedans. The initial M30 models were produced in displacements of 2,494–2,986 cc, with later versions having displacements of up to 3,430 cc. As per the BMW M10 four-cylinder engine from which the M30 was developed, the M30 has an iron block, an aluminium head and an overhead camshaft with two valves per cylinder.
  The engine was given the nicknames of 'Big Six' and 'Senior Six', following the introduction of the smaller BMW M20 straight-six engine in the late 1970s. The M30 was produced alongside the M20 throughout the M20's production, and prior to the introduction of the BMW M70 V12 engine in 1987, the M30 was BMW's most powerful and largest regular production engine.
  Following the introduction of the BMW M50 engine in 1990, the M30 began to be phased out.
  Ward's have rated the M30 as one of the "Top Engines of the 20th Century".
context_section_description: The first 2,494 cc (152.2 cu in) version of the M30 was introduced in the 1968 E3 2500. This version uses dual Solex Zenith 35/40 INAT carburettors, has a compression ratio of 9.0:1 and produces 110 kW (148 bhp) in most applications. It has a bore of 86 mm (3.39 in) and a stroke of 86 mm × 71.6 mm (3.39 in × 2.82 in).
  The M30B25 has previously been called the M06 and M68, prior to BMW retroactively renaming it the M30B25V (V for Vergaser- carburettor in German).
  Applications:
  1968–1977 E3 2500
  1974–1975 E9 2.5 CS
  1973–1976 E12 525 — 107 kW (143 bhp), Solex 4A1 carburettor
  1976–1981 E12 525
  1977–1979 E23 725
caption: M30 production in Munich
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