The Variable Timing Sprocket on the Toyota Prius allows you to adjust the timing of the cam for the hybrid engine on the fly. As a result, the fuel economy and power output increase while emissions decrease. The Variable Timing Sprocket rotates the camshaft a few degrees in one direction or the other in response to oil pressure from the computer so that the intake valves open earlier or later as needed. The Variable Timing Sprocket, in synchronization with the crankshaft, maintains the effective combustion during city starts and while traveling at constant speeds on highways. As a result, it provides a smooth torque across the engine's range of revolutions. Later Prius generations adopted a Variable Timing Sprocket with multiple keyways and slot adjusters for precise advance or retard, which replaced an early generic system using factory marks. Toyota refined the unit to meet the hybrid's unique load changes. With offset positions for performance sets, the new design allows a builder to choose between low-end thrust or high-rpm pull without changing cams. No matter what style you are using, every Variable Timing Sprocket must be fitted with a new chain, guides, and tensioner to ensure correct alignment. Even a two-degree mistake can cause horsepower loss. The Prius engine will always be in its designed sweet spot. Routine set replacement also aligns with Toyota service intervals.
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