Variable CAM Timing
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Variable CAM timing is a concept that entails changing the camshaft timing, as needed, depending on engine LOAD demands. This technology was impossible just a few years ago, due to the state of the art electronics needed. The latest Variable CAM Timing (VCT) systems are infinitely variable, meaning they have no specified settings. CAM timing can be changed or varied instantaneously across the whole range (ie. Plus or Minus 30 degrees from normal). By varying the CAM timing, the ECM can regulate the power curve to meet its own needs. On any gasoline engine, each RPM setting has an optimum CAM timing setting, depending on load. Up until a few years ago engines were set whatever the CAM lobes were machined at. With modern VCT, this relationship can be varied, also varying the engine's power curve. Most modern VCT systems do not control valve lift, but do great by simply changing open and close timing points during engine operation. See how it works here, with this superbly animated training video on automotive technology and variable cam timing (VCT).
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