Blower pulley question

With choices of 8mm, 11mm, 13.9 and 14mm blower pulley, what is the determining factor in your choice of mm for your combination?

 

On the 13.9 you only have one belt length choice.

 

if the 13.9 length works belts are much cheaper

 

With the 8mm, your overdrive choices are almost endless, and if you buy good belts they are very tough.

 

In order from most ratio choices to less; 8, 11, 13.9, 14

In order from weakest to strongest; 8, 11, 13.9, 14 (this is complicated by the different belt materials available)

Would you guys agree?

 

Alot depends what pulley center distant you have. Each different size mm has a few different belt lengths available. Depending on what overdrive you want-you may have to go with a certain mm size belt. I believe RBS superchargers web site has a chart with center-to-center distances and tooth counts to be able to determen what belt one needs.

Dale