Variable Cam Timing

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RH side VCT Oil Control Solenoid and harness from a Ford 4.6L SOHC 3V V8 engine

Variable Camshaft Timing (VCT) is an automobile variable valve timing technology developed by Ford. It utilizes electronically controlled hydraulic valves that direct engine oil into the camshaft phaser cavity. These oil control solenoids are bolted into the cylinder heads towards the front of the engine near the camshaft phasers. The powertrain control module (PCM) transmits a signal to the solenoids to move a valve spool that regulates the flow of oil to the phaser cavity. The phaser cavity changes the valve timing by either advancing or retarding the camshafts to allow for optimum engine performance, reduced emissions, and increased fuel efficiency.

The VCT system is used in Ford's Triton 5.4L 3-valve V8 engine; the Australian Barra 182 and 240 Inline-6s; Ford's 4.6L 3-valve V8 engine used in the 2006-present Ford Explorer and 2005-present Ford Mustang GT; and the 2.0L Zetec Inline-4 used in the 1998-2003 Ford Escort ZX2 and the Ford Contour. It was also used in 99-00 mercury cougar, and in Europe on the 1.7 Ford Puma.

VCT is also used in many Nissan RB engines most famously those used in Nissan's Skyline variant. And also in their popular SR engines from 1993 onwards.

See also