To tell you the truth, although I am an engineer, I do not have the slightest understanding about car technology. I am totally dumb in this area. So the normal thing to do is Google it. So I googled "what is the difference between DVVT and VVT-i" and found a good source in myperodua.com According to the website DVVT or it's full name Daihatsu Valve Variable Timing is based (copycat) on Daihatsu mother company Toyota engine, which is VVT-i (Variable Valve Timing - intelligence). They believe that DVVT is just VVT-i's engine brand name for Daihatsu cars. Both DVVT and VVT-i is designed for fuel efficiency. Basically a 1.3l should be able to perform like a 1.5 engine due to better combustion at high rpm (revolution of engine, higher gear). In short more power for less fuel. CHEAPER! Hmmm... What really happens is that the valve timer shifts the time of opening of the valve a little bit earlier than normal engines. The higher the rpm the earlier it opens and hence better ...
Chemical Engineering Lecturer, Faculty of Engineering, UMS. Deputy Director for Centre of Teaching Excellence and Academic Quality, UMS. Favourite teaching methods are a buffet of choices for students to be engaged and to learn. Main research area are in energy. Dabbled in dye sensitized solar cells, and fermentation of seaweeds for biofuel. You can find my publications on google scholar.