Techniquest Glyndr’s ZR engine with intelligent variable valve timing, shown in a cutaway view.
Toyota created the variable valve timing technology known as VVT-i, or variable valve timing with intelligence, for use in automobiles. The Toyota VVT-i system takes the place of the Toyota VVT, which was available on the 4A-GE engine’s 5-valve per cylinder starting in 1991. The VVT system is a two-stage cam phasing mechanism that is hydraulically regulated.
VVT-i, which debuted on the 2JZ-GE engine in 1995 for the JZS155 Toyota Crown and Crown Majesta, modifies the interaction between the intake camshaft and camshaft drive (a belt or chain). An actuator is subjected to engine oil pressure in order to change the camshaft position. Engine efficiency is increased by adjusting the gap between the opening of the intake valve and the shutting of the exhaust valve. [1] Subsequent variations of the system include included VVTL-i, Dual VVT-i, VVT-iE, VVT-iW, and Valvematic.
In This Article...
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 roughly 10% while increasing fuel economy by about 6%.
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.
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.
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.
VTEC vs i-VTEC: Which is superior?
Honda added i-VTEC, which effectively stands for Intelligent VTEC, for you if variable valve timing wasn’t hard enough before. Since its introduction in Honda vehicles in 2001, almost all of their performance engines have utilised it.
The above-mentioned architecture is used in conventional VTEC engines. Only the lift and duration offered by the two distinct camshaft lobes or profiles can be controlled by this technique. In order to have better control over valve timing, Honda created and combined what is known as i-VTEC, or VTC with VTEC.
Variable timing control (VTC) allows the camshaft to be advanced or retracted in order to manage valve overlap. The exhaust valve never opened and closed simultaneously in conventional VTEC engines because the intake valve always opened first. With VTC, the camshaft lobe angles can be adjusted to allow the valves to overlap or open simultaneously. It can be altered at various RPM levels due to its changeable nature.
So, What’s the Difference Between VTEC and i-VTEC?
By allowing for camshaft angle modifications, i-VTEC adds more valve timing control. The valves must open and close differently for each RPM range in order to operate at their peak performance at both low and high RPMs. The main distinction between VTEC and i-VTEC is that the former does this.
In contrast to the conventional VTEC, i-VTEC offers a smoother power band and improved performance at both high and low RPMs.
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.
VVT vs CVT: Which is superior?
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.
Is VVT-i preferable to non-VVT-i?
The vvti’s main advantages thus far are that it produces more torque at a lower rpm than the non-vvti, that it is a newer engine with less wear, and that it already has a single turbo.
The number of cylinders in a VVT-i.
This is a 4-cylinder Toyota gas engine with indirect injection and variable valve timing with intelligence (VVT-i). By altering the relationship between the intake camshaft and camshaft drive, the VVT-i system can change the timing of the intake valves.
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.
What car engine has the longest lifespan?
The Small Block V8 made its debut as a 4.7-liter in the 1955 Chevrolet Corvette (’58 model shown) and the significantly bigger Bel Air saloon. Thereafter, it was employed in many GM automobiles and trucks. Similar to the Ford Windsor, it is currently only available from GM as a “crate” engine that may be purchased to maintain an older vehicle. It is estimated that well over 100 million were produced overall.
Does VVT increase a car’s speed?
Variable valve timing is a piece of contemporary automotive technology (VVT). It aids in improving the effectiveness and general performance of engines that make use of this technology.