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The system was VarioCam eadottato by Porsche for the first time in 1992 in the 968. Similar is the VarioCam Plus adopted for the first time in the 996 turbo, the gaming VarioCam PLUSinterviene on the variation of the lift of the intake valovole and control of its timing in relation to the scheme.
The VarioCam Plus system uses 2 sets of cam lobes for each valve sull'alzata to intervene, while a hydraulic system realizes a delay of timing and anticipation at low speeds and high speeds.
OPERATING VARIABLE
DELL'ALAZATA
First you say that the show has only 2 levels. Then a valve does not have an infinite number of open positions but only two: one for each lobe of the camshaft. As you can see from the video above, the lift is operated by the piston moving in the glass instead of aiming the piston is moved by a hydraulic system. The rod can be in the sun 2posizioni: fully open and fully closed :
- fully open position: the valve stem passes through the glass and then the opening of the tappet is handled by the smaller lobe, corresponds to the fully open position the minimum raise (lower schemes)
- fully closed position: The piston closes the orifice of the tappet which allows the passage of the valve stem so that the camshaft lobes in this position will work directly and solely on the glass will be the tappet lobes larger. At the fully closed position is the maximum lift of the valves.

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VCR (Variable compression ratio)
Presented at the 79th Geneva Motor Show Peugeot 406 car mounted and denominatoMCE VCRi develops 220CV-5 with a displacement of just 1.5 l, CO2 emissions reduced estremamete 158g/Km and combined cycle fuel consumption of just 6.8litri/100Km.Nel 2010, a new version of the MCE-5 engine will be fitted with GDI VCRi, optimized combustion chambers and advanced management engine temperature, cylinder head, pistons and manifold drain. The power and torque will be increased respectively to 270 hp and 460 Nm, while the average consumption in the cycle NDEC fall below the threshold of 6.0 l / km (less than 140 g / km CO2). With this type of engine, reaching by 2012-2013 the target of 120 g / km of CO2 seems realistic for high-performance vehicles, with a significant reduction in fuel consumption for the entire range of vehicles.

SOME DATA ...
max torque 2200giri/min
max rpm max power 5500giri/min
7000giri/min
time to transition from RCmax RCmin 100ms
ability to vary independently of each cylinder RC

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by parties with a wonderful invention created by the BAVARIAN BMW
Valvetronic
How many of you know, to the distribution system of internal combustion engine is given the difficult task of planning the entry of fresh mixture and the output of the combustion gases from the combustion chamber of the engine. From the theoretical point of view, there are quite specific moments in which the valves should open and then close, in spite of that, the action Opening and closing a valve is a movement that takes time, and that is why the engines had to always work through the concept of advance of opening and closing. In practice, the eccentric, which controls the valve is shaped so as to generate what is called a phase diagram, such as to provide the elevation and lowering of the valve with the right advance necessary to produce the opening and closing Total instantly liked.
Over time, engineers have perfected the techniques of controlling the valves and they realized that it would be useful to introduce a system able to vary the times of opening and closing valves. Indeed, when the engine revs, something that happens from the technical point of view counter to the logic of optimal operation of the engine: the rotation of the camshaft is linked to the crankshaft, which means that as the number of turns a manner that creates an increase in the speed of rotation of the first. This means that if in the design stage it was decided that a profile of the eccentric to anticipate the opening of the valve, for example, an angle of 20 ° (calculated in reference to the position of the crankshaft), what happens , as the number of turns, is that those 20 ° is no longer sufficient to ensure the right cylinder filling (in other words, it is necessary to advance further the opening of valves).
So then comes the concept of variable valve timing, which is the realization of an idea that has allowed the engineers to overcome the difficulties mentioned above. Thanks to variable valve timing systems has been possible to modify the diagrams opening, moving the times of opening and closing valves. But as is often said, "the appetite comes with eating," and introduced this change, the engineers began to think they can change other characteristics of distribution systems: the valve lift.
is clear that the cabinet vary means increasing the section of the flow through the pipes cut into the head and, as a direct result, the performance of the engine. They were born and then the various distribution systems patented that landed initially on sports cars and then on those of large series. The Japanese have been big proponents of this technology and their cars heavily employ this kind of technology.
Nevertheless, the real revolution came not from the countries of the Rising Sun, but rather from Europe and in particular, coincidentally, from Germany. BMW engineers, once you reach the maximum degree of development of its system of variable valve timing (the famous Vanos), have asked a very simple thing: why not eliminate the function of the throttle body? In fact the demand is much less absurd than what one would initially be led to believe.
In this article we are talking about gasoline and clearly if we focus on their operating logic we realize that the idea of \u200b\u200bBavarian engineers is absolutely revolutionary. Why, in fact, leave the filling of the cylinders in two separate bodies mounted in series (the throttle body and valves) when developing an appropriate technology, it would be possible to manage everything by simply changing the valve timing and lift themselves? The practical solution to this question is called Valvetronic and is now available to the general public. Every BMW vehicle is now equipped with the now famous valve control system, a technology that is lagging behind in the evolutionary history of the internal combustion engine.
in particular the system VALVETRONIC
The VALVETRONIC is a system for controlling the exhaust valve timing and Apiro able to change continuously, passing these values \u200b\u200bfrom 0.25mm to 9.8mm of lift, all in favor of consumption and performance of this technical motore.A the Bavarian Valvetronic allowed to obtain a fuel saving of 10% on European approval cycle. The
vlavetronic can also speed the implementation of the order of 300ms to switch dall'alzata minimum to Max. The timing control system is coupled to the control of the throttle body.

The technological system has, however, many competitors Bavarian: VVT-i and VVT-iE, are systems designed by Toyota
VTEC is a type of system designed by Honda and produced in many variations, including 3-stage VTEC
MIVEC, is a type of system designed by Mitsubishi
VarioCam and VarioCam Plus, the systems are designed by Porsche
VVL, N-VCT and VVEL, are systems designed by Nissan
VANOS system earlier this
AVCS and AVLS, systems are designed by Subaru
S-VT, is a type of system designed by Mazda
VCT is a type of system designed by Ford
VVC, is a type of system designed by Rover
VFD and fine, and a change in valve timing system designed by FIAT