REASON FOR 4 VALVES IN AN ENGINE RATHER THAN 2 VALVES

Pulsar 135 LS and Bajaj Discover are incorporated with World’s First DTSi 4 valve Engine –designed for better performance than an equivalent capacity 2 Valve Engine.

This engine has 2 intake & 2 Exhaust valves compare to 1 intake & 1 Exhaust Valve of a 2 valve engine. These valves are smaller & light weight compared to that of 2 valve engine. 4 Valves (2 Intake & 2 Exhaust valves) are introduced to improve breathing means - intake & Exhaust process of engine.
A typical 2 valve engine has just 1/3 combustion chamber head area covered by the valves, but a 4 valve head increases that to more than 50% area. Because of this flow area of intake & Exhaust port / passages leading to valves also get increased. This facilitates induction of more quantity of charge (air-fuel mixture) and also evacuation of all burnt gases inside the combustion chamber ensure faster, cleaner & more efficient combustion. The result is increased engine performance-power, throttle response, pick up of all engine speeds.


Moreover the 4 valve engine can be revved up to much higher rpm easily, there by allowing the rider to enjoy light sports bike performance.
Advantages
  1. Better engine performance
    • Better power pick up
    • Better fuel efficiency
    • Low emissions
  2. Light weight & compact Engine
  3. No limitation of RPM:-
  4. 4 valve engine doesn’t have rpm limitations that a 2 valve engine has.
Pulsar 135 LS and Bajaj Discover are incorporated with World’s First DTSi 4 valve Engine –designed for better performance than an equivalent capacity 2 Valve Engine.

This engine has 2 intake & 2 Exhaust valves compare to 1 intake & 1 Exhaust Valve of a 2 valve engine. These valves are smaller & light weight compared to that of 2 valve engine. 4 Valves (2 Intake & 2 Exhaust valves) are introduced to improve breathing means - intake & Exhaust process of engine.
A typical 2 valve engine has just 1/3 combustion chamber head area covered by the valves, but a 4 valve head increases that to more than 50% area. Because of this flow area of intake & Exhaust port / passages leading to valves also get increased. This facilitates induction of more quantity of charge (air-fuel mixture) and also evacuation of all burnt gases inside the combustion chamber ensure faster, cleaner & more efficient combustion. The result is increased engine performance-power, throttle response, pick up of all engine speeds.


Moreover the 4 valve engine can be revved up to much higher rpm easily, there by allowing the rider to enjoy light sports bike performance.
Advantages
  1. Better engine performance
    • Better power pick up
    • Better fuel efficiency
    • Low emissions
  2. Light weight & compact Engine
  3. No limitation of RPM:-
  4. 4 valve engine doesn’t have rpm limitations that a 2 valve engine has.

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