Racing Beat RX-7 Pulley Set - Double Sheave
Packaged as a pulley set, each kit includes one (1) double sheave alternator and one (1) double sheave main drive pulley.
Double Sheave Aluminum Alternator Pulley (Part no. 11479)
The Racing Beat-designed 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.
Double Sheave Aluminum Main Drive (Part no. 11469)
The Racing Beat Double Sheave Aluminum Main Drive Pulley for virtually all 1974-92 12A and 13B engines is designed for high performance/RPM street and moderate racing use, slowing the water pump and alternator 13-15 %, thereby reducing cavitation and power loss. If used with our Aluminum Alternator Double Sheave Pulley, you can have a true dual belt system. The stock air conditioning pulley is accommodated. Timing marks are provided at 10 degrees ATC, 0 degrees (TDC), 10 degrees BTC, and 20 degrees BTC. The weight of this pulley is 16 oz.
We do not recommend this main drive underdrive pulley be installed on "street" driven cars that are used for stop-and-go driving. In addition, we do not recommend the use of this underdrive pulley on 1987-91 RX-7 Turbo II engines unless modifications have been made (shorter intake runners, etc..) to increase the engine's RPM range substantially. Turbo II engines produce their peak power in a lower RPM range, relative to a non-turbo engine.
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.
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.