Crank Pulleys

Written by Michael Federico
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An automobile's crankshaft has a very basic function: it changes the up and down motion of the pistons into a rotary motion. In a way, it functions like the chain and spokes on a bicycle that convert the rider's pedaling into movement that will actually propel the bike forward. Despite the simple function of the crankshaft, its design is extremely complex. Static and dynamic forces have to be accounted for and balanced. Also, every bit of horsepower that reaches the rear wheels has to go thorough the crankshaft, so its construction must be exact.

Crankshafts are generally balanced with counterweights and crank throws. When all is said and done, the weight of the crankshaft can reduce hp in the car. In fact, for every pound that is taken off the shaft, close to three hp can be picked up. One of the best ways to reduce weight while still maintaining effectiveness is to install a crankshaft pulley.

Types of Crank Pulleys

There are different types of pulleys on the market. The billet lightweight pulley meats standards for both the Honda B and D series. It can be found for under $110. They come polished and ready to install. There are also underdrive crank pulleys that are extremely effective for increasing a vehicle's overall power. Their design is a bit different from the billet models, and they can be used in several cars including the Acura Integra and Eagle Talon. There are also pulleys that serve as parts of comprehensive turbo systems.

Crank pulleys of any design can be found through a variety of aftermarket parts distributors. Some can be as expensive as $150, while others can be found for around $95. They can be ordered quickly and shipped within days.


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