1.2L REVOTRON ENGINE 84 6. VCT (Variable Cam Timing) The variable cam timing (VCT) control system controls the opening/closing timing of the intake valve and exhaust valve in accordance with driving conditions; improving engine output and reducing fuel consumption and emissions. The variable cam timing (VCT) controller adjusts cam shaft rotation relative to crank shaft rotation in accordance with amounts of oil in its oil chambers, controlling the opening/closing timing of the intake or exhaust valve. The amounts of oil in the oil chambers are managed by controlling the oil flow control valve in accordance with driving conditions. It improves the engine performance significantly, providing greater engine output, better fuel economy and reduces emissions. 7. Solenoid Valve (Oil Control Valve) The variable camshaft timing oil control solenoid is attached to camshaft and is hydraulically operated in order to change the angle of the camshaft relative to Crankshaft Position. The variable camshaft timing oil control solenoid is controlled by the control module. The control module sends a pulse width modulated 12 volt signal to a variable camshaft timing oil control solenoid. The solenoid controls the amount of engine oil flow. .
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