Posts tagged 'underdrive pulleys'
BBK Performance billet aluminum pulley kits offer an affordable and simple way to get additional rear wheel horsepower.
Simply they reduce the power the engine uses to turn the front engine accessories - therefore that additional power goes to the rear wheels.
An underdrive pulley refers to either crankshaft or accessory pulley like an alternator or water pump pulley specifically designed to turn at a slower speed than stock.
When the the front engine pulley ratios are changed they will be rotated by the serpentine belt at a slower rate regardless of the vehicle. This means that they are under driven hence the term under drive pulleys.