What is a Single VVT Camshaft?

A single VVT camshaft allows a car to have variable valve timing, resulting in greater power and fuel efficiency. VVT also increases RMP, reduces emissions, and increases the lifespan of the car's engine. While this system is more complex than a standard camshaft, it is less expensive and requires only a single hydraulic valve gear.

A single VVT camshaft can be found in an inline engine. Typically, an inline engine has one cam per head, and a single cam per cylinder is found on a six-cylinder engine. However, a single VVT camshaft is also available in some four-cylinder engines.

In a single VVT camshaft, two rocker arms move independently. The left arm actuates the left inlet valve, and the right arm actuates the right inlet valve. The timing of these two cams is relatively slow, with the left and right cams both moving independently of each other.

In addition to VVT camshafts, some car manufacturers also use VTEC, or variable valve timing, in their engines. The technology enables car makers to vary valve timing based on the engine's speed. This allows the engine to run efficiently at low speeds, while maximizing power output when needed.

The variable valve timing in single VVT engines is controlled by an ECU. This software takes into account the engine temperature, oil pressure, and vehicle speed. The ECU then programs the system to select a particular cam profile, based on these parameters. The solenoid then sends oil pressure from a specific valve, forcing the locking pin to transfer.