R P M Motorsport's Combat RX-7 TS - (¤C¥J)

Pulley System

The GREX smaller crankshaft pulley underdrives accessories by 30% relieving strain on the engine.  The picture shows  how the belts are rearranged because the air pump has been  removed. The added GREX system increases the belt contact area on the water pump. The belt used is a 5 rib 29" belt.