In Reply to: Nope VTECH is much better! posted by Shawn Fogg on June 11, 1999 at 15:50:10:
: VANOS just alters cam timing.... VTECH actually changes lift and duration.
...is solenoid actuated valves. No camshaft required, you let the engine management system decide when to open and close the valves.
The problem: it takes MUCHO power to fire the valve solenoids in any kind of reasonable time. I designed a power supply for a guy to do this on a little 3 cylinder engine, as I recall the supply took in 12 V and put out 80 V at 16 amps. So it took over 2 hp to run, but I think you gained 10 net. It was kinda cool actually, my first real big forward converter...
But that engine only turned at 4000 RPM or so and had 8.5:1 compression as I recall, a 6 cylinder at 7000 rpm with 10:1 would be a real challenge, but it COULD be done.
Especially once they do the changeover to 42 V electrical systems, look for that in less than 5 years.