VarioCam is anautomobilevariable valve timing technology developed byPorsche. VarioCam varies the timing of theintakevalves by adjusting the tension on the timing chain connecting the intake andexhaustcamshafts. VarioCam was first used on the 1992 3.0 L engine in thePorsche 968.

Porsche's more recentVarioCam Plus combinesvariable valve timing with two-stage lift on the intake side. The two-stage valve-lift function is performed by electro-hydraulically operated switchable tappets. Each of these 12 tappets consists of concentric lifters which can be locked together by means of a pin. The inner lifter is actuated by a small cam lobe, while the outer ring element is moved by a pair of larger-profile lobes. The timing of each valve is seamlessly adjusted by means of an electro-hydraulically operated rotary vane adjuster at the head of each intake camshaft.

Valve timing and the valve profile are continuously altered according to conditions and engine load. For improved responsiveness on cold starts, VarioCam Plus raises the amount of lift and retards valve timing. At medium revs with minimal loads, the valve lift is lowered and timing advanced to help minimize fuel consumption and emissions. For maximum power and torque, the lift is raised and the timing is advanced.^[1][2] This system debuted on the 1999Porsche 996 Turbo.

A system similar to the VarioCam Plus system was developed bySubaru for the redesigned EZ30R H6 engine, which debuted in 2003 in theLegacy andOutback.^[3]

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