Toyota Valvematic Valve Timing.

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Toyota joined the electronic valve timing and lift club in 2008, with its Valvematic technology. Compare with BMW Valvetronic, and Nissan VVEL, Valvematic is different in some aspects. Its construction is relatively simple, It is compact and does not increase the height of cylinder head. It improves the power output by 10 percent, while reduces in 15 percent, the fuel consumption during regular driving. Most importantly, it adds little inertia and friction, thus, does not compromise top end power.

Valvematic employs an intermediate shaft to achieve continuous variable valve lift. The intermediate shaft, has an actuating geared member rocker arm, like for each cylinder. Each actuating member rocker is made of two finger followers, and a roller bearing. The finger followers can rotate in relation to the roller by means of internal gear threads, and an electric motor attached to the end of the intermediate shaft. Also very important, is that the gear threads of the roller rocker, and finger followers, are in opposite direction. This mean that when ...

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