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In page BMW M47:

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The original M47 diesel engine featured non-common-rail direct fuel injection and a 2.0 L; 119.1 cu in (1,951 cc) block. First seen in 1998, the M47D20 produced 100 kW (134 hp) and 280 N⋅m (207 lb⋅ft) in its original 320d/520d guise, and 85 kW (114 hp) with 265 N⋅m (195 lb⋅ft) in the 318d variant. All M47 engines have one Swirl and one Tangential intake port per cylinder, which can each improve performance under different conditions. These features are not to be confused with swirl flaps,[1] which were introduced in the M47TUD20.