MPI Roller Secondary

[deepnsteep]

I posted the same over on SW, but maybe there are others here that could help.

Just picked up a roller secondary for my MM. Anyone got a suggestion for helix and spring? It's got PI end dumps, milled head, and 151" track. Running 8cr in the primary with .8g in both holes.

http://snowest.com/forum/showthread.php?t=109032

Thanks!

deep

 

[triplefastaction]

I run a 48/40 with a green spring at 70 degrees on my piped 156" Viper. It was set up by MPI and works good.

 

[shavedheadedyamaha]

i have always ran with out the rivets in the ends to ramp up when i didn't it would get to 8000 rpm and slowly climb to 85 anot now it jumps to 9000 and drops to 8500 and it seems to work better.. it might dig holes if you just cob it but i like the pull with high to right then low to right

 

[deepnsteep]

Thanks for the info!

I hear that the MPI helix is just a cut cat roller helix. Does anyone know if that is true and if so...what the cut pattern is?

Thanks!