WHUT?

MY POST WAS CORRECT.

'Isnt i-vtec a continuously variable...'

 

 

 

Dugg for brutally inaccurate!

 

Uhh, no. You can't just say 'continuously variable..' and pretend to be right. i-vtec has continuously variable cam phasing, essentially 1/3 of what makes vtec, cam phase(angle), lift, and duration. Lift and duration are still confined to 2 specs, low and high.

Honda's next generation A-vtec will truly be continuously variable phase, lift, and duration, look at the patent drawings. This in theory removes the need for a butterfly-throttle valve (such as BMW's valvetronic).

 

How is this wrong? all i-vtec does is continuously_vary_the lift and duration of the cams - which is what Vtec does, no?

 

The VTEC is a simple switch between two cam profiles depending only on engine speed. While the i-VTEC is a bit more complex, it optimize the valve timing based on many variable factors like load, speed, throttle position, etc. Thus the i-VETC is better for road cars. Today, almost all cars are equipped with variable valve timing just to optimize engine performance and economy.

one thing that nobody mentioned here, that only the S2000 and NSX are equipped with twin-cam all valve vtec which was designed to solve the problem of having hi-speed cam at lower revs. All other Honda engines use the VTEC (or I VTEC) on one cam or some of the valves.

That