In some cases, it can allow modest adjustments in phasing. Variable valve event and lift control, often referred to as Variable Valve Lift (VVL), can provide a discrete or continuous range of lift and/or duration control between two limits. Systems that provide Valve Timing Control (VTC)-also referred to as Variable Valve Timing (VVT) systems-are the most basic camshaft based VVA technology and simply change the timing of the valve events without significantly altering the lift. Engine Variable Valve Timing (VVT) Solenoid (Left, Right). With the exception of some large low speed two-stroke engines, all current production VVA systems are camshaft based.Ĭamshaft based systems can be further classified according to their function. Vvt Variable Valve Timing Actuator Solenoid 15330-75020 for 11-15 for Toyota Tacoma 2.7L. Labor costs are estimated between 114 and 144 while parts are priced between 203 and 224. They are however quite robust and interference between the piston and valve can generally be avoided even during system malfunctions. The average cost for variable valve timing control solenoid replacement is between 317 and 368. Camshaft based systems are less flexible in that the valve event must occur within the confines of the cam profile. Camless systems offer the most flexibility in valve lift and timing but are prone to increased risk of catastrophic failure if the valve in the lifted position can interfere with the piston. VVA systems can be classified as camshaft based systems or camless systems. * Additional functions made possible by combining with valve timing control. General classification of VVA technology Type

Variable valve timing solenoid cost