After 12psi belt slip with 6-rib what you need to calculate is impeller speed

 

He will not have a problem getting 10 + psi on a 6.0 with the P1.. Is what I am getting at here

 

so then after 10psi ,the belt stats slipping?

 

not mine

 

Sharpshooter, what psi are you seeing with 4.25 and D1

 

@ 6000 rpm's it makes 11#'s

 

Marco will probably see less than that with his huge cam. But I'm just guessing.

 

Maybe Im wrong but John is making that with the P1 and 3.6" pulley you have a D1 and a 4.25"

 

I'm not understanding?

If you are referring to my post "not mine",it is directed to the post just above it about belt slip past 10#'s.

and the difference between John's set-up and mine that you stated makes sense to me

 

What Im trying to say is that after 12# belt slip will be encountered on a P1 running that small of a pulley. You havent because you run a D1 and your already at 11# and have a 4.25". Much more belt wrap.