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There’s nothing cooler than a camshaft because valve lift, duration and timing have a drastic effect on engine performance.
Prior to the development of variable valve timing and variable valve lift systems, these were fixed specifications, and performance compromises had to be made depending on the vehicle usage.
Today, modern engines utilizing the VVT form are able to maximize performance and drivability throughout their operating range.
There are two different types. Early VVT systems were considered discrete, and worked using step adjustments, with one timing for the lower RPM range, another for the higher RPM range.
These system advancements give us continuously variable valve timing, and through cam phasing, the PCM is able to make continuous adjustments for peak performance in all conditions and all operating ranges.
Cam phasing refers to the rotation of the camshaft through an actuator, to advance or decelerate the camshaft in a VVT system.
Systems that vary valve lift and duration are much more complex, with the use of multi-profile camshafts and rocker arms, among many other designs.
Crankshaft and camshaft sensors are the main input to system operation as they monitor the relationship between crankshaft and camshaft position, but there may also be many other sensors and solenoids affecting operation, depending on the system.
This means that diagnosing these systems requires the use of a fully functional, two-way scan tool to view engine data and operating parameters, as well as perform a functional test of the system.
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