A cammed motorcycle engine refers to an engine that has undergone modifications to its camshaft(s) or cam profile(s). The camshaft is responsible for controlling the opening and closing of the engine's valves, which affects the intake and exhaust cycles. Here are the key differences between a cammed motorcycle engine and a regular motorcycle engine:
Camshaft profile: A cammed engine typically features a modified camshaft profile compared to a regular engine. The cam profile determines the duration and timing of the valve opening and closing events. Cam modifications can be made to increase valve lift, duration, or overlap, resulting in improved performance characteristics.
Increased power: One of the primary reasons for camshaft modifications is to enhance engine performance. By optimizing the valve timing and lift, a cammed engine can generate more power and torque across the RPM range. This can result in increased acceleration and higher top speeds.
Altered power band: The modifications made to the camshaft can shift the power band of the engine. A cammed engine may have more power at higher RPMs, requiring the rider to rev the engine higher to access its full potential. This can lead to a different riding experience compared to a regular engine that may deliver power more linearly across the RPM range.
Idle and low-speed behavior: Camshaft modifications can affect the engine's behavior at idle and low speeds. A cammed engine may have a rougher idle due to increased valve overlap, which can result in a lumpy or choppy sound. Additionally, low-end torque may be sacrificed in favor of improved high-end performance.
Fueling and tuning: Camshaft modifications can impact the fueling and tuning requirements of the engine. A cammed engine may require adjustments to the fuel-air mixture and ignition timing to optimize performance. This often necessitates recalibrating the engine's electronic control unit (ECU) or carburetor settings.
It's important to note that camshaft modifications should be performed by experienced professionals who understand the specific requirements of your motorcycle's engine. Additionally, local laws and regulations may apply to engine modifications, so it's essential to ensure compliance with legal requirements.