3 Valve Engine Technology

3 Valve Technology: What Is It & How It Works?

 | 2 minutes read

What is 3 Valve Engine Technology?

3 Valve Technology incorporates Two Inlet & One Exhaust Valves in the engine.

For - Increased air-fuel intake, More power, Reduced Weight.

How Does This Technology work?

3 valve technology incorporates a total of three valves, two each of the inlet and one exhaust valves in the engine. Thus, it is different and better than one valve each of the inlet & exhaust valves used in the conventional engine design. The engine uses its valves just like humans use nose. Thus, two inlet valves provide for more opening of the area to suck the air-fuel mixture.

3 Valve Engine
3 Valve Engine (Courtesy: Vespa)

Earlier, manufacturers used two exhaust valves to create balance. However, also it increased the overall weight of the engine and thereby of the vehicle. So, engineers came up with an idea of eliminating one exhaust valve. Also, they reduced the size of the inlet valves in the 3 valve technology. This resulted in reducing the weight of the engine and the vehicle. This increased the power to weight ratio and thereby the performance of the engine and vehicle.


Moreover, the two inlet valves in the 3 valve design increase the area of the air intake. It allows the more air-fuel mixture to get into the cylinder. Thus, it increases the amount of air than the conventional design. The newer generation engines with the 3 Valve engines are now being commonly used in bikes or scooters. So, by keeping two inlet valves, manufacturers are able to achieve higher performance from the vehicles.

3 Valve Engine Technology
3 Valve Engine Diagram

Which models employ 3 Valve Technology?

Furthermore, Vespa SXL 149 & VXL 150 both use a 3-valve engine. The cylinder head with 3 valve engines would reduce the engine’s weight and increases its performance. Besides, it would increase the combustion area as compared to conventional 2 valve design while eliminating one of the two unneeded exhaust valves.

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