1. Increased top-end power: Raising the exhaust port changes the timing of the exhaust cycle, causing the exhaust gases to be released sooner. This allows the engine to rev higher and produce more power at higher RPMs. However, it can also reduce low-end torque.
2. Improved efficiency: A higher exhaust port can help improve the engine's volumetric efficiency, meaning that more of the air-fuel mixture is used for combustion. This can lead to better fuel economy and overall performance.
3. Reduced overheating: Raising the exhaust port can help the engine run cooler by promoting better heat dissipation. The higher exit point allows hot exhaust gases to escape more efficiently, reducing the thermal load on the engine components.
4. Enhanced scavenging: A well-timed exhaust port opening can create a scavenging effect, where fresh air-fuel mixture is drawn into the cylinder as the exhaust gases escape. This helps improve combustion and power output.
However, it's important to note that raising the exhaust port requires other modifications to be made to the engine, such as adjusting the piston, cylinder head, and exhaust system, to achieve optimal performance. It's typically performed by experienced engine builders for specific performance needs and might not be suitable for every application.
