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misspelled its vanos, sorry bout that. in reply to your post. In 1993, BMW first released an engine utilizing VANOS in the M50 2.5 L model. Initially, the incorporation of VANOS was limited to the intake valve. VANOS (as it is now known) is infinitely variable cam timing on the intake valve. With VANOS, the camshaft has the ability, through complex gearing, to open the intake valves earlier into the intake stroke, allowing the engine to breathe in more air during high RPM operation, and thus produce more high RPM power. In the Beginning of 1996 with the 3.2L Euro motor, BMW offered Double-VANOS, which simply duplicated the VANOS system on the exhaust valves. last year and this year BMW upped the stakes and introduced Valvetronic. Valvetronic takes the previous idea of infinitely variable valve timing, and adds in infinitely variable valve LIFT. In other words, Valvetronic controls how far the valve opens depending upon how hard the driver is squeezing the throttle. A standard camshaft and rocker arm are still in place, but there is now an intermediary arm in between. This intermediary arm pivots based on throttle input, allowing the camshaft to open the intake valves steplessly as little or as much as the system demands. One of the major benefits of this system is the total elimination of the throttle butterfly. This means that the valves themselves are the only things controlling the amount of air flowing into each cylinder. With this system the intake manifold remains full of air the whole time, allowing much faster throttle response. In short displacement is slowly being replaced by technology. Also yes it is possible to equip a honda with vtec with a turbo..... a turbo uses exaust gases to spool a turbine to force air into the intake, vtec is completely different, Vtec is all valve timeing.
good luck.
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