The term "heavy crank" refers to a crankshaft with a higher mass or weight in the Enfield Bullet 350 motorcycle. The heavier crankshaft design is intended to enhance the torque output of the engine. Here's how it works:
Increased Inertia: The heavier crankshaft has a higher rotational inertia. Inertia is the resistance to change in motion. When the engine's piston moves up and down, the heavier crankshaft stores more energy due to its increased inertia. This stored energy is then released during the power stroke, providing a stronger and more consistent torque output.
Smoother Power Delivery: The heavier crankshaft helps to smooth out the power delivery of the engine. The additional mass helps to reduce rapid fluctuations in engine speed and provides a more stable rotation. This results in a smoother transfer of power from the engine to the wheels, enhancing the overall riding experience.
Increased Low-End Torque: The heavier crankshaft design contributes to increasing the low-end torque of the engine. Torque is the twisting force that enables the motorcycle to accelerate and climb uphill. With a heavier crankshaft, the engine can generate more torque at lower RPMs, allowing for better low-speed performance and improved pulling power.
It's important to note that the heavy crank design is just one factor among several that can influence the torque characteristics of an engine. Other factors such as camshaft design, intake and exhaust system configuration, and engine tuning also play a role in determining the overall torque output.