In article <10474lehgvh649b@corp.supernews.com>,
Al Smith <ecarecar@yahoo.com> wrote:

> V-Tec gives an engine two cam shafts - a high speed and low speed cam shaft.
> Each cam shaft is optimized for its own speed range.

No, it gives the engine additional cam *lobes* for high engine speeds.
There are both SOHC and DOHC varieties of VTEC, and on the DOHC variety,
there's one shaft for the intake valves, and one for the exhaust valves,
like a normal DOHC engine. There are low-speed and high-speed lobes on
each camshaft.