Honda’s VTEC and Toyota’s VVTi

Posted by admin at March 23rd, 2007 under Auto Knowledge Section, Automobile |

Print This Post Print This Post

What are VTEC and VVTi?

The real secret of developing efficient petrol engines is in the supply of air, the art which has been researched since the internal combustion engine was seen. The VTEC by Honda and VVTi by Toyota are important steps in achieving high efficient engines.

VTEC (Very Talented Engine Control) and VVTi (Variable Valve Timing with Intelligence) are similar in effect but differ in technology. VVTi engine features in Toyota Camry, Toyota Innova, Toyota Corolla, Toyota Prado and VTEC engine powers Honda Accord, Honda CR-V, Honda Civic, Honda City.

Honda’s VTEC:

Honda’s VTEC uses two sets of cam shaft profiles – one for low and mid range rpm and another for high rpm operation. An electronic switch shifts between the two profiles at a specific rpm to increase peak horsepower and improve torque. When you ride Honda’s car, you can both hear and feel the change when the ‘VTEC’ kicks in at higher rpm to improve performance. While this system does not offer continuously variable valve timing, it can make most of high rpm operation while still providing solid driveability at lower rpm levels.

Toyota’s VVTi:

Instead of on/off system that VTEC employs, Toyota’s VVTi employs a continuously variable system that maximizes valve timing throughout the revolution range using a hydraulic system rather than the mechanical system to alter the intake cam’s phasing

Honda’s VTEC Vs Toyota’s VVTi:

The main difference between VTEC and VVTi is that VVTi maintains the same cam profile and alters only when the valves open and close in relation to engine speed. Also, VVTi works only on the intake valve while Honda’s VTEC has two settings for the intake and exhaust valves, which makes for a more dramatic gain in peak power than VVTi can claim.

Like this post & Share your comments

Comments

 

  1. rijuhdas says:

    Yes Honda prooves their technologies once more.

  2. karthi says:

    Toyota Motor Corp has developed a next-generation engine valve mechanism which can improve the fuel efficiency of petrol-powered vehicles by about five to 10 per cent. The new system also reduces carbon dioxide emissions, boosts engine output by at least 10 per cent and enhances acceleration responsiveness. Toyota plans to introduce the new system, called “Valvematic”, in the near future, starting with a new vehicle model with a 2.0-litre engine. The system adjusts the volume of air taken in by continuously controlling the intake valve lift volume and the timing of the valve’s opening and closing, the automaker said. Toyota aims to completely revamp its gasoline engine and transmission lineup by 2010 to reduce emissions.

  3. Rob says:

    In the differences you mention the lack of differing cam profiles in VVT-i, and the fact that it only acts on the inlet. In fact there was also a VVTL-i engine which altered the cam profile to give increased valve lift, and the are Toyota engines with Dual VVT-i that works on the exhaust too.

  4. Julius Munyao says:

    How many kilometres per 1 litre of petrol can a VVT-i engine cover?

  5. Raka says:

    I think that’s not accurate. Vtec only works for intake valve, and VVTi works for intake and off-take.

  6. Naomi says:

    I Know that’s not correct. In fact, Honda’s VTEC engine STANDS for Variable valve Timing and Electronic lift control, also the Duel overhead camshafts are constantly working together, not one switching off, and then the other one switching on. I think you need to do more research. It gave me a chuckle though, “Very Talented Engine Control”- that’s funny

  7. boi says:

    V.T.E.C (Variable Valve Timing and Electronic Lift Control) <<< is correct translation V.T.E.C (Very Talented Engine Control) <<< is wrong…!!! who teach u…??? search by internet la bro…!!!

  8. Battleship pelayo says:

    Oh my gudnezzz !!!

  9. Kris says:

    Honda engines are SOHC ( Single over head cam) they do this to cut off 30% of engine weight so that they gain weight to torque ratio. on the other hand Toyota engines are DOHC (Dual Over head cam ) These engines are more reliable but slightly noisy than honda.They are heavy and have better handling at higher speeds. Whatever said both has its own advantages and disadvantages.Honda earns more milage only by making lighter engines. I have both cars and i can make out this clear difference.

  10. Tony says:

    sooo thick… i have a DOHC v-tec type r(honda) and a 20 valve BzR(toyota) both manufactures build dohc and sohc engines dohc(Double over head cam) are far superior.. the v-tec system use’s more juice and is quicker but the VVTL-i is much more reliable…

  11. charles kitonyi says:

    what is the percentage difference in fuel effeciency on VVT-i over EFI engine?

  12. Gajanan Hirde says:

    Too much technological words.Going over the head.Is it fit for Indian Roads and Fuel supply.You get spurious petrol on 50% highway pumps.Or it be used for Pune Mumbai Highway only.

  13. Tim Goth says:

    There is a really comprehensive discussion of these engines at Wikipedia. Look for VVT-I.

  14. Zks-Doc says:

    vvti is much better than vtec.vvti is very much fuel efficient than vtec.I have both civic 1.8 2010 and corrola 1.8 2010. corolla is much better in fuel efficiency and in speed.

  15. EJAZ says:

    both the engines are good, its only the way you mantain and use them.

  16. Nooby says:

    actually, the new honda i-vtec engine is much better in fuel efficiency and its power compare to toyota vvti engine. toyota is best in its car interior and exterior technology , but honda is best in its engine technology . it depends on you to choose either u like performance or outer beauty

  17. charles kitonyi says:

    Between the two, which one offer the best fuel economy on highway?

  18. nel says:

    Guys i have both new honda city & toyota vios both manual transmission? vvti engine is most fuel effecient and yet powerful than Vtec. VVti engine gives you better response most likely across the highland,good example: (going to baguio zig zag road)

  19. nel says:

    charles kitonyi says: March 8, 2011 at 4:45 pm Between the two, which one offer the best fuel economy on highway? Sir correct me if im wrong? It depends on way of driving sytle sir, base on my expercience both vvti & vtec has the same fuel economy.

  20. bonnie says:

    what is the percentage difference in fuel efficiency on 1300cc VVT-i over EFI engine?

Leave a Reply