Alternator Pulleys

74-91 Aluminum Alternator Double Sheave Pulley

Belt for this kit can be found here for 79-85, and here for 86-91

Double Sheave Aluminum Alternator Pulley reduces alternator RPM approximately 20% from stock RPM, and is intended for high performance and moderate race use. It is compatible with either the stock main pulley, or assuming you are not using the air pump, our Double Sheave Aluminum Main Drive Pulley. For use on virtually all 1974-92 12A and 13B rotary engines. The weight of this pulley is 7.2 oz.

Precision-machined from billet aluminum alloy, each pulley is finished with a hard anodized surface treatment to ensure superior longevity and excellent abrasion resistance. As compared with standard anodizing processes, a hard-anodized aluminum component will offer comparatively superior durability and wear characteristics.

93-95 Dual Sheave Alternator Pulley

This Mazda Competition Parts Single Sheave Alternator Pulley reduces alternator RPM approximately 20% from stock for street high-performance and racing use. For use on virtually all 1974-8-91 12A and 13B rotary engines, this aluminum underdrive pulley (3.2 oz) is intended for use with the Single Sheave Main Drive Pulley, although it can be used with the stock main drive pulley. The pulley is bored 15mm for use on small shaft alternators, although it can be bored larger if necessary.

Precision-machined from billet aluminum alloy, each pulley is finished with a hard anodized surface treatment to ensure superior longevity and excellent abrasion resistance. As compared with standard anodizing processes (typically identified by components finished with a bright red or blue finish), a hard-anodized aluminum component will offer comparatively superior durability and wear characteristics. Hard anodized components are typically identified by a darker surface coating, most commonly with a dark grey or black matte finish appearance.

Installation Note: It is not practical to offer a standard replacement belt due to the variations in engine configurations. After measuring the distance required for your application, we suggest you contact your local auto parts store to obtain the required 3/8-inch wide replacement belt.

Fits all 04-11 Mazda Rx8s.

Fits all 93-95 Mazda Rx7s.

Also fits 90-95 13B Cosmo.