Blower belt sizing input needed

[Systemax302]

Just trying to get this right the first time and not have to chase my tail...

2.76 upper, stock lower, 100 mm aux, one 90 mm and two 100 mm idlers.
As far as I can tell the alternator pulley is stock size.

Going by the chart I started with 75.5". Added 1" for the aux idler and another .5" for each additional 100 mm idler. Coming up with a belt size of 77.5".
Does this sound correct?

 

[HudsonFalcon]

Just trying to get this right the first time and not have to chase my tail...

2.76 upper, stock lower, 100 mm aux, one 90 mm and two 100 mm idlers.
As far as I can tell the alternator pulley is stock size.

Going by the chart I started with 75.5". Added 1" for the aux idler and another .5" for each additional 100 mm idler. Coming up with a belt size of 77.5".
Does this sound correct?

What chart?

For a 2.76 s/c pulley you should be starting with 73.5.

 

[P49Y-CY]

Isn't that just the old tried and true Billetflow 4-piece setup?

If so, the stock belt size is perfect.

 

[CobraBob]

According to my old Belt Selection Guide, you can use a 74.5" or 75" belt. And as @P49Y-CY said, your stock belt (75.1") should then work.

This is my old Belt Selection Guide. It's a PDF file.

 

[BLOWN9646]

75.5-76"
73.5 + 1" (aux) + 1.5" (3-90mm's to 100mm's)

 

[Systemax302]

What chart?

For a 2.76 s/c pulley you should be starting with 73.5.

View attachment 1570291

Yeah my bad, so more like 75.5"

 

[Systemax302]

Isn't that just the old tried and true Billetflow 4-piece setup?

If so, the stock belt size is perfect.

Yeah that's what I ended up buying