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  • HOW TOYOTA VVTi ENGINE WORKS? -Variable Valve Timing-intelligent

    HOW TOYOTA VVTi ENGINE WORKS?

     

    [youtube:http://www.youtube.com/watch?v=oem8LsCLikg 425 344]

    VVT-i, or Variable Valve Timing with intelligence, is an automobile variable valve timing technology developed by Toyota, similar to the i-VTEC technology by Honda. The Toyota VVT-i system replaces the Toyota VVT offered starting in 1991 on the 4A-GE 20-Valve engine. Perodua use this technology and convert the name to DVVT(Dynamic Variable Valve Timing). The VVT system is a 2-stage hydraulically controlled cam phasing system.

    VVT-i, introduced in 1996, varies the timing of the intake valves by adjusting the relationship between the camshaft drive (belt, scissor-gear or chain) and intake camshaft. Engine oil pressure is applied to an actuator to adjust the camshaft position.

    Engine designers have known for a long time that they could get better performance out of an engine under certain circumstances by allowing the intake valve to open slightly before the exhaust valve closes. This increases the time for the fuel/air mixture to enter the cylinder during the intake stroke. In this condition the exhaust and intake valves are open at the same time; this is called ‘valve overlap’. In conventional engines ‘valve overlap’ timing is fixed.

    Fixed valve overlap allows the engine to perform well within a certain rev range, however there are three main undesirable side effects.

    1) Fuel is wasted – the fuel/air mixture is not always efficiently burned and this causes unburnt fuel to pass through the engine.

    2) Higher levels of undesirable exhaust emissions are produced.

    3) Power output potential is not fully realised.

    [youtube:http://www.youtube.com/watch?v=6YxMAA7wnIU 425 344]

    Variable valve timing allows the relationship between the separate inlet and exhaust camshafts to vary the valve timing overlap. In doing so it overcomes the side effects described above by using a computer to continuously vary the intake valve timing and overlap. The valve timing and overlap are adjusted through a series of simple mechanisms to ensure the optimum conditions apply across all the working rev range. The advantages are lower fuel consumption, lower exhaust emissions and higher power output. Because the system is continuously variable, an ‘i’ for ‘intelligent’ has been added to the acronym.

    how vvti engine works

    In 1998, “Dual” VVT-i (adjusts both intake and exhaust camshafts) was first introduced in the RS200 Altezza’s 3S-GE engine. Dual VVT-i is also found in Toyota’s new generation V6 engine, the 3.5L 2GR-FE V6. This engine can be found in the Avalon, RAV4, and Camry in the US, the Aurion in Australia, and various models in Japan, including the Estima. Dual VVT-i is also used in the Toyota Corolla (1.6 dual VVT-i 124bhp).

    Other Dual VVT-i engines include the 1.8L 2ZR-FE I4, used in Toyota’s next generation of compact vehicles such as the Scion XD. It is also used in the 2JZ-GE and 2JZ-GTE engines used in the Lexus IS300 and in the Toyota Supra. By adjusting the valve timing engine start and stop occurs virtually unnoticeably at minimum compression. In addition fast heating of the catalytic converter to its light-off temperature is possible thereby reducing hydrocarbon emissions considerably.

    inside of vvti engine

    (inside of vvti engine)

    vvt-i= Variable Valve Timing-intelligent

    kdi

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    35 Responses

    1. abhi says:

      i am interested to know more about new automobile technology

    2. sifu says:

      i wanna learn about the old school engine.they have a hidden potential………
      may some one gimme the way how n where i can get the guider…….
      where are the exactly right place or person i can refer to……please.
      …………i’m the BEGINNER………

    3. kdi says:

      maybe you can try search via youtube.com about the engine operation

    4. James says:

      On a newly rebuilt 1.8L 1zz-fe, what would not allow oil to flow to the VVTi controller when the OCV and it’s screen has been replaced?

    5. mohamed says:

      i have a toyota fun cargo with a 1nze engine and it burns more fuel than the ae 100 corolla wagon with a 5a engine

    6. I was very happy to uncover this site. I want to to thank you for
      your time due to this wonderful read!! I definitely liked every part of it
      and I have you saved as a favorite to look at new stuff in your website.

    7. Nice interpratetion of the product on the ground!

    8. RootmaN says:

      why will Toyota 1NZ engine wouldn’t start after replacing a burnt cylinder head gasket

    9. sfiso says:

      Please help how to replace oil pump for toyota qauntum vvti petrol engine please

    10. allen says:

      Plz im allen from lebanon I had a Toyota supra 2jz vvti and the ocv control valve is not working how to connect it the engine is like a bicycle

    11. Ronald Mayega says:

      Plz alert me always on new engine technology.
      Also, I own a Toyota mark II super with vvti technology. But of recent, it has failed to change gears while I am up climbing a hill. But on a gentle slope, it picks momentum and mantains the speed. Plz advise me according how to handle that problem

    12. david says:

      I have a Toyota funcargo. when the car is hot the idol in is high. sometimes when you engage gear it switch off engine what the problem

    13. Kristina Weatherford says:

      I own a 2007 Toyota Camry LE. Ever since I purchased it, I have only gotten 20 mpg in the city, sometimes it goes down to 18. On the highway I can go up to 23-24 mpg. My Camry is an automatic. With this special engine, and I’ve always maintained it, none of this is making any sense. I live in Colorado Springs. Is it the altitude? Am I driving it wrong? Nobody seems to be able to give me any answers other than to say that the mileage isn’t guaranteed. I’m very careful about the “leadfoot” as I used to work in insurance, so I do understand a little bit. Does anyone have any suggestions or ideas?

    14. Abioye Segun Mufutau says:

      There is camshafts under the 2, 7 camry 4clyinder I want to know the setting
      Thanks

    15. nur says:

      i have a car on F premio 1nz vvti engine.cold condition is not srart. try 1,2,3 or selvstater then start.but hot condition is no problem, just one try and start.what’s the problem.

    16. Pamella oluru says:

      I own a Toyota Premio VVTi engine no. 1ZZ-FE, 2002 model . Recently car heated up and when we stopped for 6hrs coolant was there but it refused to start.
      Mechanic came found oil and water was mixed up he replaced the Gasket and resurfaced the Cyclinder head. But the still has failed to start.

    17. SEBIT LUPAI says:

      I NEED CRANKSHAFT FOR TOYOTA HARRIER MODEL 1998 HAW TEL ME THE PRIES

    18. yuzri says:

      Mr Sebit Lupai,lease give the detail of engine?Cc,auto or manual,petrol or diesel?Easy to find later,tq 013-309 2101

    19. Frank says:

      I have a 1Jz vvti mark2 blit. Just cranks won’t start . no fault code

    20. Geophrey Godfrey Mwakasyuka says:

      Notify me of following comments via e_mail

    21. Ivante says:

      I have toyota quantum vvti make I am looking for computer box .

    22. First off I would like to say awesome blog! I had
      a quick question that I’d like to ask if you don’t mind.
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    23. Don Root says:

      I am an Automobile Technician in Ghana and am new here on this plateform. I loved n like the things were explained with foto graph and would want to be receiving update on Toyota technologies. The lesson I learned Dis morning really opened my mind and would want to continue with sharing ideas on Toyota engines works.

    24. Don Root says:

      Pamela Oluru. Please kindly tell ur mechanic to change ur car cylinder head cus there is crack in de cylinder head. Now when de engine cools down de crack close for easy engine starting and when De engine heat up De crack on De cylinder head opens due to de expansion of de aluminum alloy cylinder head causing lost of compression and low power output. So please tell ur mechanic to change ur cylinder head den head gasket n ur car will start again. Tnx

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    31. Brian kalinda says:

      I recently replaced the timing chain & cylinder head gasket on my 1sz vvti engine as before the timing chain snapped in two pieces.after changing, the engine is able to start one kick but the when fan comes on the engine is going off also.help

    32. After replacing a burnt head gasket and piston rings my toyota funcargo vvti engine 2NZ is misfiring.i tried to replace sparkplugs and counter checked the timing but still cylinder 1 and 2 are not firing.pliz help what could be possible problem

    33. sinoya mkhalipi says:

      After replacing a burnt head gasket and piston rings my toyota funcargo vvti engine 2NZ is misfiring.i tried to replace sparkplugs and counter checked the timing but still cylinder 1 and 2 are not firing.pliz help what could be possible problem

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