No renovation, no Harley. As is well known, Harley's soul is transformed. Transforming the exhaust pipe is the step to creating Harley sound waves or appearance. Therefore, in the process of selecting an exhaust pipe, the first consideration should be the improvement of sound, appearance, or performance.
First of all, we need to understand a more serious data: Exhaust Gas Velocity. As the name suggests, it is the value of gas passing through the exhaust system, corresponding to the original Harley Davidson engine, with a value of 300 fpm (feet per second). The ideal value is set for exhaust pipes of 1-3/4 inches, so the standard diameter of the head section is 1-3/4 inches. Generally speaking, the larger the pipe diameter, the lower the sound and the better the horsepower. However, in reality, an excessively large pipe diameter can actually reduce the flow rate and limit exhaust efficiency.
Classification of ordinary Harley exhaust pipes
ShortDragPipes。
ShortDragPipe is a violent and versatile modification option, while V&HBigRadius2-2 is a representative work. The short exhaust stroke is often accompanied by high sound pressure and thermal feedback, which enables DragPipe to achieve better horsepower efficiency and sound waves at high speeds. But the neat design and lines make ShortDragPipe's popularity long-lasting!
LargeDiameterOpenPipes。
Large diameter pipes have a longer stroke and a larger exhaust diameter, resulting in lower exhaust sound waves. However, the strong appearance of large diameter pipes limits exhaust efficiency. Therefore, unique designed silencing plugs or gaskets are often added to the tailpipe to adjust different sound waves and horsepower effects.
LongStraightPipe。
A long straight pipe without a muffler can cause loud noises, but its horsepower is limited. Therefore, when developing a straight pipe, it is recommended to use a head section of 1, 3/4 inches and a tail section of 2, 1/2 inches to avoid this problem.
2into1。
The design of the 2-in-1 tube tends towards a low-speed setting, which can effectively reduce back pressure and improve the emission efficiency of the factory. It not only has a substantial horsepower increase effect, but also has a charming 2-1 low pitched sound wave. The 2-1 tube is the choice of high-performance players.
