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Posted by Tom M. on June 12, 1999 at 06:12:36:

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.

: Shawn

...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.

Tom M.


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