VTEC or no VTEC?

[hootmon]

Ok.. I've got questions for the Gen 3 guru's...
My yellow Magna was stock, then I put 105 mains in it..
My Red bike was stock, then I put 105 mains and 42 slow jets.
Both set-ups with a K&N air filter.

With both stock configurations and the 105/40 on the yellow bike, I got a surge of power at 6300 RPM. Now with the 105/42's I do not.
I always attributed this surge to the Magna being a VTEC design (additional valves come in action at a specific RPM). Slow jets should not be in play at 6300 RPM at all..

The new config pulls strong thru the entire RPM range, I get small lulls, but I attribution this to running completely stock exhaust right now, and running a tad rich; but I'm at a loss as to why I've lost my surge..

So, my questions...
Why have I lost my surge at 6300 RPM in my present configuration?
Is the Magna a VTEC design or not?

[magnagregcan]

It's not designed as such. My Element has the variable valve timing and it kicks in around 4500 RPM giving a noticeable boost in power.
The Magna power band is strongest between 4800 to 7500 RPM; it really pulls strongest in that range. This can be seen on the graph showing HP and torque curves.

[lragan]

After buying my first '96, which came stock except for Cobra pipes, I decided to change the jets and use a K&N.  The reason at the time was it was running too lean, as evidenced by plug inspection and popping on deceleration.  After the carb mods, I was thrilled to discover the power band had widened substantially.  The bike would pull strong from 3K on up.  Nice bonus.

Years later, I bought the second bike (a sucker for a "bargain") and expected, and found, the same poor performance at lower rpm.  It didn't really pull until over 5K, and took off at about 6000 to 6500.  Of course, it wasn't stock, either, having a set of loud pipes I still haven't positively identified.

So, based on these two experiences (admittedly with non-stock exhausts), it occurs to me, Hoot, that you no longer feel the surge in the power curve above 6K because you have boosted the performance in the lower ranges with the carb, air filter, and exhaust you are running.  Hence the power available at 6500 rpm is not that different any more.

I suppose a more technical way to put this is that you have flattened the power curve by boosting the low end performance.  I don't see how this would have reduced the power at 6500, but I suppose it might have...  I am suggesting that there is no longer a surge because the curve leading up to it is enhanced.  

Without dynamometer tests, it is all subjective anyway.

[roboto65]

Nope no VTEC like Honda cars the valves run the same the cam runs on the same chain.  The 'Powerband" you are feeling is just when the fuel air mixture is at its optimum and that varys with stroke of the engine shorter stroke one way longer stroke the other cannot remember which LOL the planets have aligned and all that LOL

Every four stoke engine out there has one ever watch the Drag racer rev there engines why do they do that because the HP and torque curves are up in that range for them.

[TLRam1]

Same issue I have Hoot with my 97, I don't have the hit like I did with my 94 or the 01. I changed to 40/108's and wonder if I am running rich up top.

[tedkraus]

Not to hijack the thread, but since it is kind of all over the place I figured I would ask a question. Has anybody ever ridden one of Honda's bikes with VTEC? is it any good or just hype? Please describe if your experiences?