The Subaru Outback's Variable Timing Sprocket functions to optimize the engine's breathing performance across the rev range. Acting like the cam gear in the timing chain set of the engine, the Variable Timing Sprocket carries out its function, lining up with crank marks to keep the pistons and valves in sync. In factory setting, a simple match of the stamped marks will deliver reliable operation. However, performance builders soon discovered that even a two-degree misalignment can rob dozens of horsepower. As such, later versions of the Variable Timing Sprocket incorporated multiple keyways, slotted hubs, or offset bushings that allowed owners to fine-tune cam phasing with a degree wheel. Earlier Outback engines relied on a single fixed timing mark. Later Outback models gained the adjustable style. This meant you could advance the timing for stronger low rpm pull or retard it for top end surge. According to Subaru, when replacing the Variable Timing Sprocket, a complete kit comprising the crank sprocket, chain, guides, and tensioner should be fitted to ensure correct alignment. By adhering to this procedure, uneven wear is prevented while the Variable Timing Sprocket does not drift out of spec over thousands of miles. This ensures that every Subaru boxer engine provides the expected torque and efficiency to the driver.
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