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24VIDEO: Dry but fascinating explanation of variable valve timing

Honda K20Z3 featuring i-VTEC - click above image to watch the video

23Behold the cam-less future

Mechanically actuated valves may soon be a thing of the past. We've made over a century's worth of improvement on the same basic combination of a camshaft, followers (or lifters), a poppet valve and a spring. We've gone from using pushrods and rocker arms to actuate the valvetrain to direct-acting buckets motivated by an overhead camshaft with variable phasing and lift. While engineering ingenuity has managed to wring incredible performance and flexibility out of these setups, there's only so fa

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