3" Alternator Pulley for Powermaster Alternators

Upgrade your charging system with this 3-inch alternator pulley designed for Powermaster alternators. Increasing the pulley diameter helps slow alternator RPM at higher engine speeds—reducing heat, drag, and wear while maintaining reliable charging performance.

Features:

• Precision-machined 3" diameter

• Direct fit for Powermaster alternators

• Slows alternator speed for improved durability at high RPM

• Ideal for performance and racing applications

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 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).

Perfect for high-revving engines where alternator overspin can become an issue, this pulley helps extend the life of your Powermaster alternator without sacrificing charging performance.