High Quality Content by WIKIPEDIA articles! The BMW N52 is a straight-6 engine made by BMW, which debuted in 2004 on the BMW E63 630Ci. Its crankcase is made entirely of magnesium and aluminum, a first in the world of engine construction. BMW used Alusil aluminum cylinder sleeves, which offer high heat conductivity, and cast them into a lightweight magnesium block, creating one of the lightest production engines of its size class in the world at 161 kg (354 lb). It includes BMW's second generation Valvetronic system and Double-VANOS for fuel-efficiency (12% fuel savings over the previous generation BMW M54 engine - and increases performance). Producing 63 kW (85.5 hp) per liter of displacement, it has the lowest weight per horsepower of any six cylinder engine (1.24 hp per kilogram with the latest version). It is the world’s lightest six-cylinder engine.

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