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Originally Posted by mega5918  Hope you got the difference, in VTECH the camshaft is moved during operation as the RPM of the engine increases, this is done by using the oil presure inside the engine. So in VTECH the engine RPM desides how much the inlet and exhaust valves open... |
The cam does not move, there is a different lobe for every stage.
BMW's valvetronic technology moves the cam.