HEY ROTOR HEADS...
just wanted to know if i have a double alternator pulley , with a stock 12a. what size belt to i need.? will it give more power? what do i need to connect it. i have ac belt off. let me know.
i have an 84 rx7 gs. with 157k. i will be pulling the waterpump this weekend so i was going to get belt. also was the best thing to use to seal the water pump

 

sorry it was a dual belt, not double. sorry.

 

i believe its just the stock size belt , i may be wrong though.

 

It may very well end up being one size bigger than the stock belt. the reason is because the dual belt alternator pulley is an underdriven pulley so therefore it is a larger diameter pulley.

In my setup I have an underdriven alternator and main pulley. I am able to use the stock belt, but keep in mind that the underdriven main pulley is smaller than the stock one, basically making up for the size difference from the bigger alternator pulley

 

GSL-SE with power steering had dual belts from the factory the 2nd belt was for the P/S pump but it should use normal factory belts.

 

If the alt position is adjustable, wouldn't the same size belt be used? all you have to do is adjust the alt position accordingly.