How do crank pulleys differ from accessory pulleys gains?
Accessory pulley systems work as a function of RPM. The faster the engine spins the more power will be freed up. This is why most accessory pulley systems only make significant power in the top 15-20% of the power band. Crank pulleys work differently. They work as a function of torque. The maximum gains for a crank pulley are achieved where cylinder pressures are at their peak (this is where max torque occurs). As a result They create excellent low to midrange torque as well as high end HP. The power is created at all rpms throughout the entire power band. Crank pulleys make power from just past idle all the way to redline just as if the entire power band is pushed upward on the dyno versus just one section of the power band.
