Porsche's VariocamPlus uses hydraulic actuators to increase valve lift and a mechanism similar to VTC for phasing.Originally Posted by EuroDude
Ferrari uses the cam sliding technique, which I think is silly. How reliable could you make a sliding cam in a 6000rpm changeover point? And the area of contact between the cam and rollers would be much narrower compared to conventional valvetrain. They must be using exotic materials and expecting the cams to last less than 200,000km (what Ferrari exceeds 100,000km anyway)
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