Yes, old and new Harley Davidson motorcycles can sound different. The difference in sound primarily stems from changes in engine design, exhaust systems, and regulations over the years.
Older Harley Davidson motorcycles often had engines with a different design and configuration compared to newer models. For example, classic Harley Davidson motorcycles from the early and mid-20th century often featured large, air-cooled, V-twin engines with a distinctive sound. These engines typically had a lower compression ratio, longer stroke, and a different firing order compared to modern Harley Davidson engines.
Additionally, older motorcycles may have different exhaust systems that contribute to the sound. Classic Harley Davidson bikes often had straight or open exhaust pipes, which produced a deep, rumbling sound. These straight pipes provided less restriction to the exhaust flow, resulting in a louder and more aggressive exhaust note.
In contrast, modern Harley Davidson motorcycles have undergone significant engineering changes to meet emissions regulations, improve performance, and reduce noise levels. These changes include improvements in combustion efficiency, electronic fuel injection systems, catalytic converters, and mufflers with sound-damping technology. As a result, newer Harley Davidson models tend to have a slightly different exhaust note and may sound somewhat quieter compared to older models.
Some enthusiasts may modify their Harley Davidson motorcycles to achieve a particular sound, which can make even newer models sound similar to or mimic the sound of older ones.
Ultimately, the sound of a Harley Davidson motorcycle is part of its iconic appeal and varies across different models and generations, adding to the overall character and experience of riding these legendary bikes.