Excellent! This is exactly how the VVTi in the toyotas work. Wonder if its the same as the S-VT?Erv187 said:at a specific rpm, the computer signals an Oil Control Valve to open, this lets oil pressure go through a special gallery in the inlet cam bearing, through the centre of the inlet cam to the VVT pulley. There's a small piston in the VVT pulley, and once it gets enough pressure behind it, it starts to move outwards, causing the outer part of the pulley to turn in relation to the inner part. when the computer signals for the VVT to operate, the OCV opens and thus causes the VVT pulley to advance the inlet cam timing by 30°, reference the crankshaft.