How Harley Twin Cam Works

Harley-Davidson's Softail models are known for their unique engine mounting system, which sets them apart from other motorcycles in the market. As the engine rpm rises, the vibration becomes less intrusive and the genius of Harley's mounting system comes into play, making the motorcycles very smooth and comfortable at highway speeds.

In contrast, Touring and Dyna model motorcycles tend to shake quite a bit at idle, with the vibration being noticeable at the seat, floorboards/foot pegs, and handlebars. This is because these models use a different engine mounting system, which allows for more movement of the engine during operation.

Harley riders refer to this type of engine mounting as 'rubber-mounted'. The rubber mounts are installed in the area where the engine will vibrate, effectively dampening the rotational shaking effect. Metal links also play a crucial role in this system, allowing the engine to rotate freely around the same center as the crankshaft while preventing any additional movement in other directions.

The TC-96 (Twin Cam – 96 cubic inches) engine is used in all H-D Dyna and Touring models. This engine is part of Harley-Davidson's Big Twin family, which includes two different versions: the Evolution and the Twin Cam. The direction change of the mass is the main cause of engine vibration, as it involves a large amount of mass (two pistons, wrist pins, rings, and connecting rods) changing direction twice for every revolution of the crankshaft.

Harley-Davidson motorcycles use a single-pin crankshaft, where both connecting rods ride together on that pin. This design helps to reduce vibration and noise, making the engine run smoother and more efficiently. Overall, Harley's Twin Cam engine mounting system is designed to provide a smooth and comfortable riding experience while minimizing vibration and noise.

How harley twin cam works