Engine & Components
- Shop For The Bike
- Screamin Eagle Performance
- Air Cleaners
- Engine & Components
- Heat Shields
- Muffler End Caps
- Performance Kits
- Specialty Tools
- Suspension Kits & Shocks
- Transmission & Components
- Tuning & Ignition
FILTER BY:Clear All Filters
Engine & Drivetrain Components
Modifying your intake and exhaust systems are basic steps in improving a race engine’s performance, but you need to get inside the engine to maximize torque and horsepower. Screamin’ Eagle® Pro Racing Parts delivers the track-tested cams, cylinder heads, pistons, valve-train, and driveline components you need to build a durable race-winning engine.
Choosing A Cam
There are a few basic questions you should ask yourself when selecting a camshaft for your Twin Cam engine.
WHAT IS THE PRIMARY USE OF THE MOTORCYCLE?
Are you looking for a bump in low-end torque for your loaded touring bike, or are you seeking a big boost in horsepower to push your lightweight bike to victory at the strip?
WHAT TYPE OF RIDING DO YOU DO?
Is your riding style relaxed or aggressive? Do you spend a lot of time riding stoplight to stoplight, or do you prefer a leisurely two-up ride on back roads and freeways?
WHAT OTHER MODIFICATIONS HAVE BEEN MADE TO THE ENGINE?
Have you installed a mild Stage I air cleaner and street-performance muffler package, or have you gone all-out with big bore cylinders, high-compression pistons and ported cylinder heads?
When building an engine to satisfy these performance objectives, the relationship between horsepower and torque is one of the most significant concepts to understand. Camshafts, cylinder heads and stroke length determine where the torque and horsepower peaks occur. While hot cams, higher-flowing cylinder heads and a free-flowing exhaust system will move the peaks higher up the RPM band, conservative cams may feel stronger to a street rider because the maximum torque occurs at lower RPM. The experts at your Harley-Davidson® dealer have the knowledge, skill and experience to recommend the optimum cam specifications for your riding demands.