Alta AMP-ENG-520 Lightened 2% Overdrive Crank Pulley for 02-06 Mini Cooper S/JCW

Vehicle Fitment

• 2002-2006 Mini Cooper S (R53, 1.6L Supercharged I4)
• 2002-2006 Mini John Cooper Works (R53, 1.6L Supercharged I4)

Fitment Notes

• Fits R53 chassis with factory Eaton M45 supercharger.
• 2% overdrive pulley slightly increases boost for improved performance.
• Not compatible with naturally aspirated Mini Cooper or R50/R52 chassis.
• Requires proper belt alignment and tension check after installation.

Features

• Precision-machined 6061-T6 billet aluminum construction.
• 2% oversize design for a mild increase in supercharger speed.
• Weighs ~2.3 lbs less than factory pulley to reduce rotational mass.
• Improves throttle response and acceleration feel.
• Maintains OEM accessory drive alignment and reliability.
• Direct bolt-on installation using factory crank bolt and keyway.
• Optimized balance for vibration-free operation at high RPM.
• Made in USA with quality materials and precise machining.

Specifications

• Part Number: AMP-ENG-520
• Material: 6061-T6 billet aluminum
• Configuration: 2% overdrive, lightened
• Weight Reduction: ~2.3 lbs vs. OEM
• Diameter Increase: +2%
• Compatibility: Mini Cooper S/JCW R53 (1.6L Supercharged)
• Finish: Machined aluminum
• Warranty: Limited manufacturer warranty

Included Components

• 1x Alta AMP-ENG-520 crank pulley (2% overdrive)
• Installation instructions

Product Description

The Alta AMP-ENG-520 Lightened Crank Pulley is engineered for performance enthusiasts seeking a subtle yet effective power upgrade on the 2002-2006 Mini Cooper S and JCW R53. Machined from 6061-T6 billet aluminum, this pulley reduces rotational mass and increases supercharger drive speed by 2%, improving throttle response and mid-range torque without compromising reliability.

This direct-fit replacement retains OEM belt alignment and accessory function while delivering faster revs and a more responsive feel. Perfect for daily drivers or lightly modified Minis, the AMP-ENG-520 offers precision machining, weight savings, and measurable performance gains--all with straightforward installation and long-term durability.