Facts about VVT, i-VTEC and i-DTEC Engines

 Engine technological innovations evolved over year by year. Traditionally engines come with a fixed valve timing, Valve timing determines how much period valves stays opened and closed during each cycle of engine operation.So it's important that the operation of valves stay open and closed. It's actually controlled by Cams, Most engines contain only one kind of camshaft. But in VVT engine, there are more than two cams present in the camshaft, so it's possible to have more than one valve timing depending up on the need for power.  So if the engine needs less power, the small cam will allow only little valve lift and if more power is needed, the bigger cam will facilitate the supply more air. So using variable valve timings more power and efficiency can be attained. After Multi valve technology the VVT becomes to enhance engine output. Valves are crucial role playing components in engine breathing. The timing i.e: Air intake and exhaust are controlled by shape and phase angle of cams. To optimize engine performance and output it requires various timing at various speeds. According to the speed of the vehicle Intake and Exhaust valves should lift. It regulates A/F ratio based on speed. For Eg: When you rev the engine overlapping between intake and exhaust must be increased. when you are at lower speeds torque must be improved to optimize driveability.

VTEC and VVT-i systems were developed by Honda and Toyota respectively in order to improve the efficiency of car engines. VTEC (Variable Valve Timing and Lift Electronic Control) is a valvetrain system developed by Honda that allows engines to achieve turbo level specific output without the bad fuel efficiency that turbocharging normally introduces. VVT-i (Variable Valve Timing with intelligence) is a similar system developed by Toyota and has several variants among which VVTL-i (Variable Valve Timing and Lift intelligent system) is analogous to VTEC. VVTL-i was first used in 1999 Toyota Celica SS-II but has been discontinued because it does not meet Euro IV specs for emissions. VVT-i Variable Valve Timing with intelligence technology of Toyota plays a good role in VVT technology. They developed this technology. Now it has been used in various cars like Nissan Neo, Fiat Barchetta, Porsche, etc.

I-DTEC stands for Intelligent Diesel Technology Electronic Control. First of all, let me clear that i-DTEC engine has no similarity with i-VTEC engine even though they come from same manufacturer Honda. It's basically a CRDI diesel engine with all aluminum construction to reduce weight, and the engine using the lowest viscosity engine oil in the world. It's a DOHC engine compared with SOHC layout of 1.5 I-VTEC from Honda (I-VTEC do come with SOHC layout in higher models though).

Honda may have named it I-DTEC to resemble with its I-VTEC siblings. Anyways still no confirmation from Honda regarding the Synonym of I-DTEC. I think it doesn't have much significants since it's just a kind of CRDI. Maruti names it DDIS, Ford calls it TDCI, VW calls it TDI and I-DTEC are just an other CRDI.