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
- Better engine performance
- Better power pick up
- Better fuel efficiency
- Low emissions
- Light weight & compact Engine
- No limitation of RPM:-
- 4 valve engine doesn’t have rpm limitations that a 2 valve engine has.
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