This manual provides comprehensive technical specifications for camshafts designed for multiple V-Twin engine families, including Evolution (EVO) Big Twin, Evolution (EVO) Sportster, Shovelhead, Panhead, Ironhead Sportster, and XR Series models. It details critical engine mechanical data such as valvetrain specifications, camshaft lobe profiles, timing events, valve lift, valve duration, and overlap, as well as information on compression ratios and piston specifications relevant to cam selection. This resource is invaluable for enthusiasts, custom builders, and performance mechanics seeking to understand, upgrade, or tune these iconic air-cooled V-twin engines.
The purpose of this manual is to serve as a focused technical data and specification guide, consolidating essential camshaft information for a wide range of V-Twin engines. It covers engine performance tuning aspects, offering guidance on camshaft selection based on desired performance characteristics and providing installation insights. The manual details the impact of camshafts on powerbands, torque curves, and idle quality, and includes information crucial for tuning engine management systems, whether carbureted or fuel-injected. By presenting detailed specifications for lobe separation angle, valve lift at TDC, and dynamic compression calculations, it empowers users to make informed decisions for engine builds and performance modifications.
