Engine Power Pulleys

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Engine Power Pulleys
Engine Power Pulleys

Power pulleys are commonly used on high performance vehicles, because they have the ability to transmit power more efficiently, which provides more horsepower and torque. The key to a power pulleys ability to create more power is its smaller size. Since it is smaller, the pulleys and belts have the ability to spin faster which will increase throttle response slightly. The reduced resistance on the pulleys is what frees up more power to the engine. The average amounts of power gains offered by using a power pulley is around 5 to 10 horsepower depending on the size of the engine and other components that are being used. Since power pulleys are just a bolt on installation, they can be installed by people with little knowledge of engine parts and accessories.

Most power pulleys are machined out of aluminum which makes them extremely durable yet light enough to deal with the increased response speeds. An anodized hardcoat is usually applied to the power pulley to improve the life of the belt which is rolling on the pulley. These pulleys are also finished in many different colors which helps provide a more aggressive look in the engine bay. These pulleys are normally purchased in kits which come with pulleys and a proper fitting belt to be used with them.

When replacing factory pulleys with power pulleys, there may need to be some other modifications made inside the engine. The main modification needed to be made in most systems is to the alternator because of how it is affected by lower idle speeds. Since the pulleys are smaller, they will not spin in as many rotations as a larger pulley would. An alternator that is not spinning at the proper speed may affect the vehicles electrical system and may not fully charge the battery. A common symptom of a system that is being starved of energy is dimming lights that were not as powerful as before. To correct this problem with the alternator, a smaller one that is designed to produce more power at lower speeds may be used. Other components that may be affected by a power pulley are the fans, water pump, and any other component that is running of the pulley system in the vehicle.

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