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Pulleys - Crank & Underdrive

Pulleys - Crank & Underdrive

Crankshaft pulleys, also known as harmonic balancers, work the accessories of the engine like the alternator.  Underdrive pulleys do the same thing as a crankshaft pulley, only they are smaller as to slow down the use of those accessories (like the alternator, air conditioning, water pump, etc) for use on the track.  High performance vehicles usually tend to have underdrive pulleys as opposed to crankshaft pulleys.  Zero In Racing has both from top brands like Perrin Performance and Go Fast Bits.