Audi Variable Valvelift System in Detail

Hey, guys, Honda did this a loooong time ago with VTEC, like 1989...so, what's new about it????

While joe-limon's mechanical solution was unfavorable, his theory was spot-on. If Audi really wanted perfect valve lift control, they would have created an infinitely variable design. While BMW's Valvetronic doesn't offer quite as much total valve lift, the system is "stepless" with complete, continuous control of valve lift. Audi's AVS only offers two fixed valve "steps". However, Audi has achieved similar efficiency gains with reduced component costs/complexity. But wont see the same power increases BMW does with Valvetronic. Although they should be able to find additional power somewhere else now, without efficiency losses.

VarioCam Plus doesn't offer the amount of lift and timing variations that AVS, VVEL & Valvetronic do. It does work around the same principal though. Plus, Porsche uses electro-hydraulic tappets that, when spun at excessive engine speeds, go poo.

Is that so? And on what car did Honda have variable LIFT? Valve timing and valve lift are not the same, and, as for Honda's variable valve TIMING, it wasnt first, and it also wasnt on both intake AND exhaust, until just about everybody else had it on both sides. This arcticle is about a new LIFT system, as stated in the headline, the diagram, and on the link you just clicked to get here. Maybe you also missed the part where the second paragraph begins "Based on the existing variable valve timing system which permits the valve opening and closing times to be varied, the Audi valvelift system now achieves the next step ? variable control of the valve lift, thus influencing the cross-section of the intake duct." Pretty self explanatory wouldnt you say? Its not a very long piece, so maybe you can actually read it.

4rings, Vtec is a variable lift system too. Its just no where near as complex or "smart". Another old system that accomplishes the same principle in a different way, with more limitations.

honda's V-TEC is still the best. all the other are copying thiers in principal, using a little piston to shift lobe torque, even porsche vario cam plus works in the spirit of honda's V-TEC

Anytime I can help man!

And what exactly is your problem with that? VTEC systems indeed have 2 different lobes on 1 cam. Don't try to talk about something you obviously have no idea about. Go to wikipedia or wherever first or look at an Honda engine, before posting senseless comments. btw WRITING IN CAPS doesn't make your reasoning any better at all, in case you haven't noticed.