The BMW 2002 Camshaft coordinates the actions of the valves to those of the crankshaft, allowing the traditional sport sedan to breathe easily throughout its rev range. Housed in hardened steel or cast iron, the Camshaft rotates at half crank speed via a chain or belt, with its carefully shaped lobes pushing against the valve gear so intake and exhaust ports open at the exact instant mixture flow and combustion require them to be. In the standard 2002 engines, a single overhead Camshaft operates all four cylinders, which is a balance between compact size and accurate timing, while twin arrangements applied in other vehicles are bulkier but allow even higher rev ceilings. Within the 2002 lineup, subtle Camshaft profile changes adjusted duration, lift, and lobe separation to tailor idle quality and power, the sportier versions being given sharper throttle response. BMW enthusiasts are aware that an oil of correct viscosity is essential, as the alloy's surfaces rely on that film to ward off the ravages of friction. Should scoring or breakage appear, replacement of the Camshaft is the only sensible remedy to ensure continued smooth pulling of the beloved BMW, bringing it to the redline.
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