Camshaft Variable Valve Timing VVT

Easy to follow step by step guide on how an automotive camshaft variable valve timing VVT engine works.

Automobile manufacturers have developed a variable cam timing system that adjusts the camshaft to crankshaft timing which is advanced at lower RPM's and retarded at higher RPM's.

Camshaft Actuator

This actuator is controlled by a valve located somewhere on the block, through internal passages oil is diverted to either of the the two actuator ports which causes the camshaft to advance or retard depending on engine load for optimum power and economy.

Variable Cam Timing Actuator
Best Practices

  • Change oil at manufacturer's recommendations to avoid actuator failure


Written by
Co-Founder and CEO of
35 years in the automotive repair field, ASE Master Technician, Advanced Electrical and Mechanical Theory.


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