What is a Variable Valve Timing Engine?

Variable valve timing is a type of engine control that makes it possible to vary when the intake and exhaust valves open. During light acceleration, the intake valve will open for shorter periods than during hard acceleration. The longer the duration, the more air and fuel the engine will have. The Toyota VVT-i uses an electronic control unit to calculate when to open and close the valves. The Camshaft is also adjustable, and it can overlap intake and exhaust lobes.


A VVT is an engine design that changes the timing of each valve. Most modern automobiles have this system. Depending on the model, some engines will use only one cam – the intake or the exhaust – while others will utilize both. This means that the car will be more fuel-efficient and improve its overall performance. It is important to note that manufacturers must meet emission regulations in order to sell their vehicles. It is possible to get a vehicle equipped with this technology, but it will be expensive, and it will also be difficult to find.

Variable valve timing technology was originally used to power steam engines. Later, Fiat patented it for automotive use. GM also developed an early version of the system in the 1970s but scrapped it due to lift issues. Alfa Romeo Spider was the first vehicle to introduce the VVT engine technology in North America. As time passed, many automakers introduced VVT engines, including Honda in 1989. There are now hundreds of different models of cars using this technology.


The primary function of a VVT engine is to control emissions. While the system is designed to keep the emissions within acceptable limits, it can have problems and cause higher emissions than what is recommended. These issues can include a stretched timing chain or a faulty camshaft actuator. These issues can damage the entire system and cause additional fuel consumption. So it is important to change the oil regularly. However, there are some precautions you can take to maintain the VVT engine in good condition.

The best way to maintain a VVT engine is to change the oil regularly. It is best to change the oil every 3,000 miles, and check it for contaminants. While it is important to change oil every 2,000 miles, it’s essential to ensure the engine is running at optimal levels. If you’re using the vehicle for a long time, make sure it gets regular maintenance. The system can improve your car’s efficiency and reduce fuel consumption.

The VVT engine in a car’s exhaust system can reduce emissions. It can increase power in the upper rev range and lower-down torque. In other words, it is more effective than a conventional engine. Moreover, the VVT engine can reduce fuel consumption. These benefits are often overlooked. Besides fuel economy, they’re also better for the environment. If you are looking for a car that gets better mileage, then you should consider a car that has a VVT system.

The VVT system in a car is designed to prevent exhaust gas from going to the atmosphere. The main purpose of the VVT is to improve the efficiency of the engine. Its primary function is to control emissions. Its secondary function is to optimize the performance of a vehicle’s fuel. This engine has four pistons that move up and down. This helps the pistons reach the correct operating temperature. The valves in a car can be modified with a rotary-valve valve, and these modifications are very expensive.

The VVT is a very efficient engine design. It can help reduce exhaust gases and increase power in the upper rev range. In addition, it also increases low-down torque. Hence, the VVT is ideal for everyday driving. There are several benefits to a vehicle with this system. Its advantages are more than just environmental. It is also better for fuel economy. And since the vehicle will be running more efficiently, it will improve its overall fuel consumption.

The VVT is a type of engine that has variable valves. It allows the car to regulate the air intake and exhaust pressure in order to improve the engine’s performance. The VVT-i engine has four VVT-i engines in Toyota models. The 86 coupe is one of the few vehicles with a VVT-i engine. The other cars with this type of engine also have these engines. It is worth considering the VVT system in your vehicle as it can improve its fuel efficiency.