Powermaster 3" Alternator Pulley - 6 Rib

Product details

• 3" pulley (slows RPM)
• Ideal for high rpm applications
• ONLY fits Powermaster alternators

Helpful Links

• Instructions
• Optional MechMan 2.9" pulley

Pulley Ratio Information

Calculate pulley ratio by dividing the diameter of your crankshaft pulley by the diameter of the alternator pulley.

• Example: A 7.48-inch LS crank pulley with a 3-inch alternator pulley yields a 2.49:1 pulley ratio (7.48 ÷ 3 ≈ 2.49)
• This means the alternator will spin about 18,675 RPM at 7,500 engine RPM
• Standard alternators are rated to 18,000 RPM (slightly exceeded in this example)
• Race alternators are rated to 20,000 RPM (safe)