The BMW Z4 Variable Timing Sprocket improves engine output by keeping the cam and crank perfectly synchronized under all driving conditions. This precision gear works with the timing chain, guides, and tensioner, all of which should be renewed together to preserve the exact alignment required for a dual overhead cam layout. Within BMW maintenance schedules, the Variable Timing Sprocket is treated as a wear component because a two or three degree slip can rob the engine of roughly fifty horsepower. For performance tuning, the Variable Timing Sprocket is set with a degree wheel to verify the marks that govern cam position. Over the years, two main styles of the Variable Timing Sprocket have served the Z4 line. One version pairs with a crank sprocket that offers multiple keyways so enthusiasts can advance or retard valve events and tailor low end punch or high RPM strength. The other style employs offset bushings or elongated cam sprocket slots to provide the same flexibility on modern Z4 models. Every BMW owner benefits when the Variable Timing Sprocket, chain, and guides are replaced as a matched set, ensuring factory spec performance.
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