sxviper32
New member
could someone explain the clutching on roller secondaries? i did not realize that they actually change how the ramp angles actually pull and would like to better understand it. i know turk said that it varies from one companies roller to another, but the more listed the better because not everyone is going to have the same roller's and they will eventually be asking about theirs. just tryin to get a sled dialed in with a roller (was told the 53/43 works good on the viper but now will it work as good being on a roller?) and did not know this about rollers, thanks!
yamaholic22
Active member
The reason rollers change the shifting characteristics of the clutching system is simply because of the decreased friction of the rollers riding on the helix ramp as opposed to button sliders riding on the helix ramps. The lower friction roller setup, with all other things being equal, will upshift quicker than the button secondary with a given ramp angle. If you have a button secondary setup to run with a certain engine and primary configuration, the roller secondary with the same helix as the button secondary will upshift faster and drag the engine off of its peak torque point, which will slow you down. So in order to get the engine back to peak torque, you will need less helix angle to effectively slow the upshift and keep the engine in its desired powerband. Same thing will happen on the backshift, the roller secondary will require less helix angle in order to get a decent backshift, or it will act sluggish and will have terrible top end. Also, most rollers require a relatively high amount of secondary spring pressure in order to grip the belt, because the lower friction clutch will open more easily than button secondary, causing a belt slip/overshift if not enough spring is run. Hope that helps.
Junior
New member
good info, maybe we should put this on the main page?
sxviper32
New member
thanks for the info yamaholic. i know turk said that some rollers are different from others in figuring out the angles needed to achieve the button style equivalent. does anyone happen to know how to calculate the angle needed on a roller to get the equivalent of a button secondary? thanks again! 