Bill,

Is the replacement pulley - same size as the Mazda pulley or bigger to slow down the pump OR either.

George (down under)

George,

 Depends, we have been talking about a E - SHAFT mounted alternator in this thread. This unit would include a replacement drive pulley, for the excentric shaft. This doesn't require a belt to run itself. The pulley would run other DRIVEN items like the waterpump. We can, and probably will, get quotes for a unit that replaces the stock Mazda waterpump. That unit could be under or over driven. Most of the Racemate pump/alternator units are UNDER-driven since they are intended for racing level high RPMs. Since the pulley is manufactured by them various ratios would be possible.

Bill