Honda Prelude Variable Timing Sprocket optimizes the cam timing to put the engine in a position that allows it to breathe efficiently across the rev range. Working with the chain, gears, and precise timing marks, this Variable Timing Sprocket allows builders to align cam/crank positions more precisely than the stock painted indicators allow, thus eliminating the two to three degree errors that can drain dozens of horsepower. The mechanism incorporates a combination of multiple keyways in the crank sprocket and offset bushings or slotted mounting holes in the cam gear, and by simply selecting a keyway or rotating the cam within those slots, the Variable Timing Sprocket can be applied to advance the valve opening to produce stronger low rpm torque or retard the closing to produce greater top end power. Earlier generations in the fourth-generation Prelude feature a simple single keyway style, and the later fifth-generation version features the fully slotted Variable Timing Sprocket that allows for finer degree wheel adjustment, the main difference being the expanded adjustment range and the speed with which tuners can dial in specs inside any Honda block. Regardless of style, each Variable Timing Sprocket should always be replaced as part of a complete set including chain, tensioner, and guides to ensure synchronized valve and piston movement. Following these practices keeps Honda engines lively, ensures every Prelude retains factory reliability, and provides every Honda enthusiast a direct route to customized power delivery.
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