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Pro Race 42571

25% Under Drive Pulley Kit 1996-00 Ford 4.6L 2V/4V V8 Engines

Pro Race 42571
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439-42571

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Pro Race 42571 25% Under Drive Pulley Kit 1996-00 Ford 4.6L 2V/4V V8 Engines $168.99
25% Under Drive Pulley Kit
  • 1996-00 Ford 4.6L 2V/4V V8 Engines

  • Specifications:

    Manufacturer's Part Number:
    42571

    Accessory drive systems have been made more compact on Late Model V8's like the Ford 4.6L engines by machining serpentine belt grooves on the OD of the crankshaft damper. The crankshaft damper functions as a combination crank damper and crank pulley on these engines. Under drive dampers are smaller in diameter than stock production crank dampers which slows the speed of the accessories and reduces the HP required to drive them. Since performance and racing engine applications generally run at higher RPM, the water pump, alternator and power steering pump speeds can be reduced to save HP and still meet engine cooling, electrical and vehicle steering requirements. The trick is to reduce the crank damper diameter without losing the torsion control capability required to prevent engine vibration and possible damage. The Pro Sport Under Drive dampers have been specially tuned to control crankshaft torsional vibration to stock production levels. Dynamometer tests of the Pro Sport 25% under drive damper on a 2005 Mustang 4.6L 3V engine produced a 13 HP gain over a stock production damper.

    Features:
  • 25% Under Driven Poly-V groove design
  • All Steel Water Pump pulley is finished in black baked enamel
  • Steel Alternator Pulley finished in black baked enamel (where supplied)
  • Kit contains new crank bolt, installation bolt & alternator bracket bolt

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