What are the advantages of the Vanos system in BMW? What do we save by using it? Drivers appreciate when manufacturers implement variable valve timing in cars. Vehicles become more dynamic, yet fuel-efficient. The BMW brand has also adopted this solution by applying the VANOS system. How does it work?
BMW is known for finding new solutions to improve its engines. The principles of modern manufacturers aim for more efficiency, cleanliness, and dynamism. There is a cyclical process of opening and closing the valves in the classic four-stroke drive systems.
A specific range of revolutions is considered optimal. If it is not maintained — if the revolutions exceed or decrease — the engine is inefficient.
The Norm in the Variable Valve Timing System
However, the situation changes when it comes to variable valve timing. Reducing the time and lift of the valve at low and medium speeds, as well as increasing the valve response time and lift at high speeds significantly expand this range of revolutions depending on the engine load and speed of rotation.
Thanks to this solution, the engine's flexibility increases with reduced fuel consumption, as well as its dynamism at high speeds. This is a very convenient option that saves fuel, reduces the toxicity of emissions, and even reduces gear shifting.
The VANOS system became the first of its kind on the market
It was implemented in the BMW 3 Series and the BMW 5 Series. The essence of the system lies in altering the opening and closing of the intake valves. The overall opening time remains unchanged. This function is controlled by the Valvetronic, regulating the lift of the intake valves.
The size of the air cushion being drawn in is stimulated by the variable lift. Thus, Valvetronic always works in conjunction with Vanos.
The first generation of Vanos operated in two stages. The rotation speed of the camshaft is reduced to decrease the intake valve opening angle. At medium speeds, the valve rotated in the opposite direction to open earlier.
As a result, the volume of exhaust gases entering the exhaust system decreases. But at high speeds, the exhaust camshaft took a position to open the valves later.
The Advantages of the Vanos System
When it comes to variable valve timing, the situation changes completely. The piston stroke time decreases at low and medium speeds, while at high speeds, the valve and piston speeds increase. Depending on the engine load, the piston stroke and torque also change.
With this technical solution, the engine's power significantly increases while fuel consumption remains the same. As a result, harmful emissions into the atmosphere are reduced, the need for frequent gear shifts disappears, and fuel consumption is also reduced.
Updates in Modern Engines
The VANOS system now smoothly adjusts the position of the camshaft depending on the load and drive speed. With this system, BMW has enhanced the torque element. Now it is not only environmentally friendly but also fast.
