With variable valve timing, less air-fuel combination enters the engine during light acceleration or idle, resulting in a reduction in emissions. Because the valves are open for a longer period of time during heavy acceleration, the engine receives more air-fuel mixture, which boosts power.
With Toyota’s VVT-i, the “brain that regulates engine operations,” the electronic control unit, continuously determines the ideal time to open and close the valves and activates an oil pressure valve to vary the timing by changing camshaft speed.
Some Toyota engines, including the 3.5-liter V-6 in the Highlander SUV, use electric motors to adjust the intake valve timing. Toyota refers to these engines as VVT-iE engines (for Electric). The exhaust valves of engines like the 3.5-liter and 2.5-liter used in the Camry sedan also have variable timing, and they are referred to as Dual VVT-i. Toyota claims that VVT-i increases power, enhances fuel efficiency, and lowers pollutants by adjusting valve timing based on driving conditions.
Variable timing was originally made available by Alfa Romeo in 1980. Other automakers soon followed, including Honda in 1989 with its VTEC technology. VVT-i was first announced by Toyota in 1995 and debuted in the United States in the 1998 Lexus LS 400. The first Toyota model having it in the United States was the Celica, model year 2000.
All of the current Toyota vehicles sold in the US have VVT-i engines, with the exception of the 86 coupe, Supra sports car, and Mirai fuel-cell vehicle. Both the 86 and the Supra have variable valve timing and use Subaru or BMW engines, respectively.
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Are Toyota VVT-i motors reliable?
The creation of TokyoTOYOTA MOTOR CORPORATION’s new “Variable Valve Timing-intelligent” (VVT-i) technology, which improves performance and fuel efficiency, was unveiled today.
Modern engine development must focus on both improved fuel efficiency and improved vehicle performance. The societal needs of protecting the environment and natural resources must also be met by modern engines.
Toyota added the WT mechanism to their 4A-GE sports engines in 1991 in an effort to boost engine production and torque. Depending on the state of the engine, WT permits the intake valve to open and close in two phases.
An enhanced version of the WT mechanism is called VVT-i. In order to deliver the best valve timing dependent on driving conditions, VVT-i continually modifies the open/close time of the intake valve. The benefits of VVT-i include improved fuel efficiency, higher torque and output, and decreased nitrogen oxide (NOx) and hydrocarbon emissions.
The VVT-straightforward i’s architecture makes it incredibly dependable and simple to adapt for already-existing engine designs. The new technology is anticipated to have numerous uses in the future.
A new model that will be released within the year will be the first to integrate VVT-i engines. Tests have shown that VVT-i boosts low and medium range torque by about 10% while increasing fuel economy by about 6%.
How durable is the Toyota VVT-i engine?
Everyone is aware that Toyota manufactures indestructible engines, but like the majority of man-made objects, there are production problems and prospective weaknesses to watch out for. This article will go over the Toyota 4.0 V6’s dependability in detail and the highest mpg you can get out of the v6 monster.
The 2009 and later vehicles’ Dual VVT-i 4.0 V6 engine is quiet, dependable, and smooth, with an engine life that easily exceeds 200,000 miles (320,000 km).
It goes without saying that the secret to an engine’s dependability is routine maintenance and the use of premium oils and lubricants. Undoubtedly, certain engines are more likely than others to experience mechanical and dependability problems.
So how does the 4.0 v6 fare in terms of durability and dependability? What are some of the potential problems you can anticipate and how effective are these engines really?
What benefit does the VVT engine provide?
VVT regulates airflow and exhaust Engine valves regulate the ingestion of fuel and fresh air as well as the outflow of combustion gases. In order to match the engine’s operating circumstances, VVT and lift systems modify the timing of the valves. As a result, efficiency is increased across a broad range of engine running speeds.
How reliable are Toyota dual VVT-i engines?
Dual VVT-i technology from Toyota improves system performance and helps to further reduce emissions by adjusting both the intake and exhaust valves. More power, better responsiveness, better mileage, and lower pollutants are the practical results for the driver.
Does oil burn in VVT-i engines?
I’m not sure if this belongs in Technical, but because it has an impact on many models, I thought I’d share it here. HJ has updated the automobile review area briefly, but I decided to go into more detail here for everyone’s benefit.
To put it simply, any Toyota VVT-I 1.4, 1.6, and 1.8L engines (1zz 1.8, 3zz 1.6, and 4zz 1.4) produced between 2000 and mid-2005 may experience high oil consumption of 1L/600miles. I don’t believe the smaller 1.0 and 1.3 engines, the 2.0, or the larger VVTI engines had this issue.
Insufficient oil capacity and inadequate piston and piston ring design were the root causes. Due to the oil-ways sludging up as a result, the rings’ surrounding hardened oil eventually caused the bores to misalign.
Since extending the warranty on these engines to six years, Toyota might retrofit these to older Toyotas built before around July 2005.
New Toyota vehicles built after around July 2005 have this patch installed, thus they should not experience this problem.
1. Buy a Toyota built after July 2005 with a VVT-I engine, with the exception of select Corollas that have the fix since September 2005. Therefore, obtain the VIN and contact Toyota UK.
2. If purchasing an older model, contact Toyota UK to see if the patch has already been implemented because the warranty will no longer be valid.
The most dependable Toyota engine is which one?
The first word that comes to mind when most people think of “Toyota is “quality. Toyota is known for producing dependable cars that last for many years. Of course, a dependable engine is found within every dependable vehicle. When you purchase a Toyota vehicle, you are investing in high-quality equipment that will serve you for many years. The engines of these cars are a major factor in this. We have a huge selection of new and used Toyota cars at Orangeville Toyota in Orangeville, Ontario, all ready for you to test drive. We shall discuss some of the greatest Toyota engines ever produced in this blog.
The 2JZ-GTE is the well-known turbocharged inline 6-cylinder found in the Toyota Supra. It has an incredibly robust cast-iron engine block, aluminum heads, and maybe the smoothest twin-turbo engine acceleration ever.
Toyota gained a reputation for producing rugged, dependable vehicles thanks to the 22R-E. The 22R-E was first manufactured in 1982, and in 1984 it was made standard on Toyota pickup trucks and 4Runners. Through 1995, Toyota continued to sell the 22R-E in its pickup trucks and on the 4Runner. The 22R-E was Toyota’s last iteration of its “engines from the R series, which were originally manufactured in 1953. The R engine series has a lengthy, illustrious history, much like Chevrolet’s small-block V8. One of the longest production runs for a Toyota engine had a fitting conclusion with the 22R-E.
The rear-wheel-drive Scion FR-S (also known as GT-86) coupe is powered by the 4U-GSE engine. The 4U-GSE, a horizontally opposed 4-cylinder, was created in collaboration with Subaru. The motor combines Subaru’s well-known dependability “together with the ground-breaking D4-S combo port and direct injection system from Toyota. The engine, which is built to rev, puts out 197 horsepower at 7,000 RPM. The engine is well-liked by fans and is fitted with a 6-speed transmission in the 2,800-pound Scion FR-S (also known as the Toyota GT-86 or the Subaru BRZ).
The T series engine, which was produced between 1970 and 1985, was largely responsible for Toyota’s emergence as a global powerhouse. The T-series was available in the Corolla, Celica, and Corona and had unbeatable dependability, exceptional fuel efficiency, and respectable performance. Numerous instances of the engine’s excellent durability are still in use today.
The 1GD-FTV is a super-efficient 4-cylinder, 2.8L diesel engine and one of Toyota’s newest engines. The 1GD-FTV, which has 174 horsepower and 330 lb-ft of torque, is found in Toyota Hilux pickup trucks and Land Cruiser Prado SUVs. The 1GD, which produces 25% greater torque and is 15% more fuel-efficient, takes the place of the 1KD. NOx emissions are decreased by 99% when selective catalytic reduction (SCR) is used. Possibly the most cutting-edge diesel engine now in use is the 1GD-FTV.
Why are Toyota engines so durable?
Toyota cars last a very long time and feature some of the most dependable engines available. This is a result of the business’ thorough attention to production and design. Before the car is supplied to the consumer, any flaws are found and fixed thanks to the quality management systems.
Do you prefer CVT or VVT?
In response to your query, VVT can undoubtedly provide efficiency advantages. Since CVTs experience more drivetrain losses than manual gearboxes, they can’t actually be regarded as efficient.
How can I tell whether my VVT is functioning?
The engine will also misfire or appear to stumble if your VVT switch is malfunctioning while your car is carrying extra weight, going up hills, or when you press hard on the accelerator to accelerate quickly. This is frequently brought on by a switch’s electrical malfunction rather than always by the switch itself. It’s likely that the variable valve timing switch won’t need to be replaced if you identify this issue and call a nearby ASE-certified repair to evaluate the situation. However, a correct diagnosis is required to confirm that it is an external issue. The likelihood of future engine damage will rise if you ignore the issue.
Regardless of the exact cause, you should always be proactive and get in touch with a qualified mechanic as soon as you observe any of the aforementioned warning signs or symptoms. The possibility that a problem can be fixed without resulting in further harm to other engine components greatly improves if you identify it as soon as the symptoms appear. As soon as you see any of these symptoms, call a local YourMechanic experienced mechanic.
What makes VVT and VVT-i different from one another?
VVT-i is a smart application of the VVT technology that I previously described, employing microprocessors to control the VVT functionality through a few actuators. Toyota created VVT-i, which began using it in 1996 and brought changes to the timing of the intake and exhaust valves. The Toyota VVT technology, which was introduced in 1991 for 4A-GE engines, was intended to be replaced with this variable valve timing technology for automobiles, which is somewhat comparable to BMW’s VANOS.
By adjusting the mechanisms between the camshaft drive (belt, chain, etc.) and the intake camshaft, the technology is to blame for differences in the timing of the intake valves. The engine oil pressure that is applied to the actuator to change the camshaft position serves as the adjustment’s medium. Higher engine efficiency is the result of adjustments made to the gap duration between the opening of the intake valve and the shutting of the exhaust valve. Since the release of VVT-i, a number of variations of this system have been developed, including VVTTL-i, Dual VVT-i, VVT-iE, and Valvematic.
What distinguishes VVT-i from dual VVT-i?
As far as we know, the 1.5 liter engine lacks dual VVT-i. The Corolla sedan and hatchback have a 1.8 (dual VVT-i) engine, while the Corolla wagon has a 1.5 (single VVT-i) engine. Both of these Toyota vehicles are sold new in New Zealand.
The difference between single VVT-i and dual VVT-i is that single VVT-i refers to an engine with variable valve timing on only the inlet cam. So, in broad terms, it is basically just a cylinder head alteration, so I wouldn’t get too worked up about whether it has dual or single VVT-i.