Quote:
Originally Posted by Siriusly.Andrew
I never knew what the differences in the F heads and G heads were. (Because of the Matrix I know of at least 2 engines with a G and F head lol. 1ZZ-FE vs 2ZZ-GE). I had a good idea of the differences between i-VTEC and VVTL-i, and the non - i versions of both, but now they are confirmed.
Though I'm still confused a little by how exactly Valvematic works. I've been watching the video and I can SEE how it works, but why / how does it work like that.
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Looking at that vid again it appears I put the cams in the wrong spot in my sketch. I blame the 'transparency' for my error. The cams are actually closer to the center of the engine.
Basically the central bit with the roller element on it is what the cam is in contact with.
The slider that the controller pushes into the followers (the two fingers on each side of the part with the roller) adjusts how much they move relative to the camshafts. Think of the followers as growing longer so it pushes further for the same amount of camshaft lift.
Now if they can adjust lift to the point where it is so low the valves don't open, you no longer need a throttle to control air into the engine. Valvetrain is now precise enough to do that itself.