So what are the difference? I know the basic, but does anyone know in detail of the difference between the two?

 

from what i understand, and i may be wrong, is that vtec is a different cam profile for the intake side only. this creates a low amount of torque but great revs and horsepower. i-VTEC has a cam profile for both intake and exhuast creating more torque. "i" stands for intelligent.

 

driving difference is that with VTEC you get a louder or more aggressive engagement. where i-vtec is a smoother trasition of power when engaged.

 

DOHC Vtec engines have different profiles on both the intake and exhaust cams. Not only on the Intake side.

 

sohc cam only operates on the intake side, dohc operates both intake and exhaust as does the i-vtec. the difference is the beyond me though. maybe the timing is even more advanced.

 

So for K-Series, you can't hear the i-VTEC engage?

 

its not as dramatic. the added torque makes it feel like less engagement.

 

straight from a Honda facts book:

the i-vtec design enhances the benefits of vtec by adding variable timing control (vtc). vtc is a hybraulically operated system that controls the phasing, or timing, of the chain-driven camshaft, advancing or retarding it on the intake cycle.

 

Haha, have you ever heard the K-series crossover with an intake and no hondata? It is loud... The added torque is not enough to do away with the jolt of extra power in stock form, however hondata has done wonders to the midrange power through tuning the ecu with Hondata #4, or you can get hondata's k-pro which is a completely tunable ECU. With hondata the powerband is smoothed out so then I will agree with the statement because there is no noticeable transition.

 

This is correct