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Home >> Jaguar >> 2010 >> XFR >> Repair and Diagnosis >> External Pages >> Different car >> Section 143 (Engine - V8 S/C 5.0L Petrol -- XF/X250) >> Engine - V8 S/C 5.0L Petrol >> Engine - System Operation And Component Description (G1762452) >> Description And Operation >> Valve Train >> VCT Operating Ranges

VCT Operating Ranges

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CAMSHAFT VALVE OPENS VALVE CLOSES
Intake 29 degrees BTDC (before top dead center) to 33 degrees ATDC (after top dead center) 207 to 269 degrees ATDC
Exhaust 244 to 194 degrees BTDC 6 to 56 degrees ATDC

The system consists of a VCT unit and a VCT solenoid for each camshaft. The ECM controls the system using PWM (pulse width modulation) signals to the VCT solenoids.

The torsional energy generated by the valve springs and the inertia of the valve train components are used to operate the system.

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