What're Camshaft Adjustment Valves

TechASSIST: Camshaft Adjustment Control Valves

The camshaft adjustment valve (also known as an oil control valve) is an integral part of the variable valve timing (VVT) system in modern engines. Each manufacturer has different technology and terminology for the system, some of the most recognisable names include VVT, VVTi, VTEC and VTi (For a full list please see Table 1). Many of which have been introduced with iconic VVT milestone vehicles.

There will also be some differences between manufacturers as to how the systems operate but fundamentally the concept remains the same…

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