VVT-i powered Car Engines in Uganda

Not too long ago I wrote an article about the D4-D engine. Am pretty sure if you read it then you must got some good knowledge about it. Now today I want to tell you about the vvti engine. Just like the D4D engine in the diesel vehicles, very few people know what the vvti engines really mean or how they function.

When you want buy a new car, you have to put into consideration the type engine that will best suite your needs. In this Car guide we shall help you determine if a VVTi engine loaded car will be your preferred choice in your next car purchase. That’s why I have decided to write about this new petrol engine type by Toyota on the Uganda auto market.

What is this VVT-i label on Toyota Car Engines?

VVT-I stands for Variable Valve Timing with intelligence is an automobile variable valve timing technology developed by Toyota. This is Toyota's name for the variable-valve control system it uses on its engines. The “intelligence” aspect of VVT-i refers to the systems ability to sense driving conditions such as acceleration or going up or down hills.

So, how does the VVT-I Toyota Car Engine work?

With the Car Engine, the Variable-valve control continuously varies the timing and duration that the intake valves are open to allow air-fuel mixture into the combustion chambers to provide better performance, higher fuel economy and lower emissions across a range of driving situations.

Unlike the earlier engine types like the EFI (electronic fuel injection), the VVT-i eliminates the performance compromise of having fixed valve timing that has to work at low speeds and at foot-to-the-floor high-speeds. It allows the engine to "breathe" — move air-fuel mixture in and out — at a pace that matches the driving conditions and provide more efficient operation.

Furthermore Toyota’s Dual VVT-i technology adjusts both the intake and exhaust valves, which makes the system more efficient and assists in reducing emissions even further. This can be evidenced due to the limited blue smoke you used to see coming out of vehicles.

With this new tech, you would think that cars fitted with VVT-i engines don’t emit any smoke at all!
In addition the as a driver of a VVT i powered car you will feel more power, better responsiveness, better mileage, and lower emissions.

Unlike the EFI engines, variable valve timing with intelligence enhances your engine performance, by allowing the engine to adjust the valve timing in ways that draw more fuel and air into the engine to produce more power at specific times.

Further more 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.

• Fuel is wasted – the fuel/air mixture is not always efficiently burned and this causes un-burnt fuel to pass through the engine.




• Higher levels of undesirable exhaust emissions are produced.




• Power output potential is not fully realized

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 due to the intelligence.

About Dual VVT-I Car Engines

Dual” VVT-i (adjusts timing on 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 and various other 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.

Some Cons to watch out for on your VVT-i Car Engine

Well a number of Toyotas not only here in Uganda but also else where in the world have encountered the problem of engine oil consumption.

This is common in the Toyota corolla and usually the millage is more than 100,000. This is mainly due to the old oil rings found on the piston which become elastic and then allow the oil to access the valves.

To overcome this problem, I advise that you change your Car engine oil after every 3000 miles covered.
Secondly you need to watch out for the quality of engine oil you use while servicing your car. This has a big determination on how long your engine will last in a good condition.

Lastly, you’re likely to be charged a few extra dimes for the new generation VVTi Engine powered Toyota cars.

Examples of VVT-i engine powered Toyota cars you can buy in Uganda

• Toyota Corolla CE/LE/S/VE


• Toyota Fielder


• Toyota Runx (Japan),


• Toyota Altis (Asia)


• Toyota Allion


• Toyota Premio


• Toyota Vista and Vista Ardeo


• WiLL VS


• Toyota Caldina


• Toyota RAV4


• Chevrolet Prizm


• Pontiac Vibe


• Toyota Celica GT


• Toyota Matrix XR


• Toyota Avensis


• Toyota Opa


• Toyota Isis


• Toyota Wish


• Lexus

Conclusion

VVT-i is just another example of advances in under-the-hood technology that continue to make vehicles more powerful, cleaner, and efficient.

The VVTi Car Engine Technology has been designed to help you save Money at the fuel pump without compromising your car engine power while protecting the environment.

So, do you think VVT-i is worth it yet…? Yes it is…!

Well, personally I do think it is worth those few extra dimes you will spend during your Toyota car purchase.

After all every driver would love to feel the power while driving.

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