4 Valve technology

What Is 4 Valve Engine Technology And How It Works?

 | 2 minutes read

What is 4 Valve Technology?

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

For - Increased air-fuel intake, Efficient combustion, More power.

4 Valve Technology
4 Valve Technology

How does 4 Valve Technology work?

This technology incorporates Four Valves, two each of the inlet and exhaust valves in the engine. Thus, it is different and better than one valve each of inlet & exhaust valves used in the conventional engine design. The engine uses its valves just like the nose. So, two inlet valves mean more opening of the area to suck the air-fuel mixture.

The two inlet valves increase the area of the air intake. It allows 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 4 Valve Technology are now being commonly used in both cars & bikes alike.

Furthermore, Yamaha's 4-Valve design features a single spark plug which is positioned at the center of the combustion chamber. This results in better spreading of the flame and enables highly efficient combustion. It also gives steadier engine performance at low-speed and a better acceleration feeling according to Yamaha.

4 Valve Engine (Image Courtesy: Yamaha India)
4 Valve Engine (Image Courtesy: Yamaha India)

According to Bajaj Auto, the cylinder-head with 4-Valve technology increases the combustion area covered by the valves to more than 50%, as compared to a 2 valve design. Thus, it increases engine’s performance such as its power, throttle response, pick up at all engine speeds. This also results in better fuel efficiency and also helps in lowering the emissions.

Following Bikes with 4 Valve Technology are available in India:

  1. Yamaha YZF 15
  2. Yamaha FZ 16
  3. Bajaj Discover
  4. Bajaj Pulsar

Watch the Bajaj 4 Valve engine in action here:

For further information the one used in Yamaha, please click here and in Bajaj, please click here.

Read more: How Valve Timing affects the engine performance?>>

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