Concentric camshaft variable valve timing (VVT) system for gasoline engines

The cam-within-a-cam consists of a solid intake camshaft within a hollow exhaust camshaft. The solid shaft has holes for cylindrical pins, located at five points that align with axial slots in the hollow outer shaft.
Camshaft-within-a-camshaft design (Mahle’s CamInCam)

Dodge Viper engine (Gen IV)

Assembled steel articulating camshaft to allow controlled phasing of the exhaust valve event.

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