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Valve Train

Variable Valve Timing (VVT) Sprocket

A Variable Valve Timing (VVT) Sprocket—also known as a VVT actuator or cam phaser—is a toothed wheel mounted on the camshaft and generally consists of two parts: the camshaft timing sprocket and a second part that moves independently of the sprocket.

After the VVT solenoid sends additional oil pressure to the VVT Sprocket, the actuator is able to advance or retard the timing of the camshaft, allowing for finer adjustments of the intake and exhaust valves. These minute adjustments to the valves, which control the flow of combustible fuel and spent gasses in and out of the combustion chamber, can help decrease vehicle emissions and improve fuel economy.

Wells VVT Sprockets are engineered and thermal-shock tested to match OE parts in fit, form and function.

The VVT Sprocket is located on the end of the intake and exhaust camshafts.

If a vehicle is experiencing one or more of the following, it may need a new VVT Sprocket:

  • Making loud rattling or clattering sounds, especially when vehicle first turns on
  • Hard starting
  • Reduced power at higher speeds
  • Check engine light is on

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