There are dozens of ways to go about varying valve timing, lift, and duration, so we're just going to look at Toyota's VVT-i ... its output signal to an oil control valve. This valve acts as ...

In last month's "Tech Scene," we compared the differences between Toyota's VVTL-i (Variable Valve Timing and Lift-intelligence ... When conditions are ideal, an oil control valve (VTEC solenoid ...