Specs for working out S/C pully size

[drftnmaz]

i'm looking for the fomula to work out pully size for a s/c.
i'll be using a sc12 so its 1.2L per revolution right?

and before you say search... i have and have read through soo many topics without finding anything.

[Crucible]

i'm looking for the fomula to work out pully size for a s/c.
i'll be using a sc12 so its 1.2L per revolution right?

yep thats right, a 175mm crank pulley will give up to 14 psi a 165mm around 12psi approx!, 175mm is as big as you can go without the crank pulley touching the waterpump. 14psi is pretty much maxing out an sc12 as far as efficiency goes, btw im referring to 4agze 1600cc, Evil-si is the guy you want to talk to as he fabricates them, pm him.