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Friday 18 April 2014 • 18:50 GMT • Last update 16:46

Camless valvetrain


A camless valvetrain has no camshaft to operate the valves. Instead, an electro-hydraulic system operates each valve. This can reduce parasitic loss and increase efficiency.

An engine which has a conventional camshaft to operate one set of valves, but a camless system for another set of valves, is known as 'half camless'.


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