Variable Valve Actuation (VVA) is the latest innovation from Yamaha which promises to increase performance on a number of their superior motorbikes. This technology was first introduced to the public at the same time as the launch of Yamaha NMAX in Indonesia in 2015. Since then, VVA has become Yamaha’s mainstay feature which is implemented in various motorbike models, including the Yamaha R15, MT15 and XSR. Here are the details quoted from Yamaha Deta.
Exclusivity of VVA on Yamaha motorbikes
VVA is not just any technology, because it can only be applied to Yamaha motorbikes with 4 stroke engines. This advanced feature changes the engine’s duration, timing and valve lift, resulting in a more stable peak performance graph. Not only does it improve performance, VVA is also recognized as being able to increase fuel consumption efficiency.
Advantages of engines with VVA
1. Even torque: Yamaha motorbikes with VVA are able to distribute torque evenly, both in traffic conditions with low engine speed and at high speed with high engine speed.
2. Increased Cornering Speed: With maximum power, the VVA motorbike provides an advantage when going through corners, whether on a straight line, uphill or downhill.
3. Maximum Power with Ease: Thanks to even torque distribution, the rider can achieve maximum power more easily and responsively.
4. Fuel Efficient: Even though it produces extra power, VVA still maintains efficient fuel consumption, making it an economical choice.
Yamaha Aerox 155VVA. [Yamaha Indonesia] How Variable Valve Actuation Works
VVA works through a component called a solenoid actuator which moves two camshaft profiles simultaneously. Its main function is to optimize power at lower and higher engine speeds. As a valve regulator, VVA controls valve opening to regulate the fuel supply into the combustion chamber.
In practice, VVA has two noken axle durations with different purposes. The first duration focuses on fuel consumption at low revs, while the second duration maximizes power at high revs. VVA activation varies depending on the type of motorbike, where on the Yamaha NMAX, for example, the VVA will activate at 6,000 RPM, while on the Yamaha R15, activation occurs at 7,400 RPM.