What are the advantages of VVT technology?
VVT-i advantages include increased torque and output, better fuel economy, and reduction of nitrogen oxide (NOx) and hydrocarbon emissions. The simple structure of the VVT-i makes it extremely reliable and easy to adapt for existing engine designs. Wide applications of the new technology are expected in the future.
Why do we need variable valve timing?
Variable valve timing enables these different behaviours by changing how the intake and exhaust valves work at different engine speeds. Thus, it helps optimise the engine’s performance, whilst also improving fuel economy and emissions.
Does VVT save fuel?
Proponents of the VVT-i fuel efficiency are right of course. You can save up to 30% fuel when you drive a VVT-I engine car compared to non-VVT-i.
How does VVT increase power?
With Variable Valve Timing, power and torque can be optimised across a wide rpm band. The most noticeable results are: The engine can rev higher, thus raises peak power. For example, Nissan’s 2-litre Neo VVL engine output 25% more peak power than its non-VVT version.
Is variable valve timing good?
There are many benefits to using VVT and virtually no drawbacks. One benefit is an increase in maximum engine speed (and therefore more peak power) – as much as a 25% increase. Low speed torque is also increased, providing better handling and drivability.
How does VVT technology work?
The VVT varies the timing of opening and closing of valves for multiple engine speeds. At high speed, the Inlet valves open quite earlier so that more air-fuel mixture or ‘charge’ enters the cylinders. This helps to increase engine’s breathing which also improves its ‘volumetric efficiency’ to a large extent.
How long do VVT engines last?
The Dual VVT-i 4.0 V6 engine found in the 09+ models is smooth, quiet, and reliable with engine longevity easily reaching over 200,000 miles (320,000 km).
What cars use VVT?
Proprietary Terms for VVT
- Alfa Romeo – Twinspark technology.
- Audi – VVT.
- BMW – Valvetronic, VANOS and Double VANOS.
- Ford – Variable Cam Timing.
- GM – Double Continuous Variable Cam Phasing (DCVCP), Alloytec and Variable Valve Timing (VVT)
- Honda – VTEC, iVTEC and VTEC-E.
- Hyundai – MPI CVVT.
- Lexus – VVT-iE.
Who invented VVT?
Corliss Orville BurandtVariable valve timing / InventorCorliss Orville Burandt is an American engineer who invented a system of variable valve timing in automobile engines. Working through a 1965 Chevrolet Corvair, he designed a system of putting a sensor into the cylinder to optimize the fuel-air mixture during combustion. Wikipedia
Are VVT engines reliable?
The Dual VVT-i 4.0 V6 engine found in the 09+ models is smooth, quiet, and reliable with engine longevity easily reaching over 200,000 miles (320,000 km). It’s no secret that regular maintenance and using high-grade oils and lubricants is the key to reliability on almost any engine.
Is a VVT engine good?
What car companies use VVT?
What are the disadvantages of VVT?
cam phasing.
| Advantage: | VVT improves torque delivery at low / medium speed; Variable lift and duration lift high rev power. |
|---|---|
| Disadvantage: | More complex and expensive |
| Who use it? | Porsche 911 Turbo |
What happens when VVT fails?
When the VVT solenoid is malfunctioning, the entire system can be compromised, which may result in intake and exhaust valves opening and closing at the wrong time. This typically causes the fuel economy to drastically reduce.
How does a VVT engine work?
How do I know if my VVT is working?
Common signs include a rough engine idle, the Check Engine Light coming on, and the engine stumbling when climbing hills or under load.