Supercharger Belt Problems

[ike34]

I keep having supercharger belt problems!

I got a aluminum tensioner, one like andersons, about a month ago and ever since then I have had belt problems.

First my belt moved 2 ribs back on the supercharger pulley, then I fixed it and then it moved 2 ribs forward, and then today it shredded itself and wrapped itself around my fan shaft. Im thinking I have it too loose but I dont want to put to much tension on it and put more stress and wear on my supercharger bearings. What should I do, how do I know when enough tension is enough?

Im running a A-trim with a 3.33 pulley and a 6 inch crank pulley.

Thanks
Todd

 

[84Ttop]

It sounds to me like your belt is either too loose or your s/c head unit is not aligned properly with the lower pulley. Take a straight edge across the front of the crank pulley and ensure that it lines up with the leading edge of the blower pulley. if not then your need to make some adjustments to get the alignment right. We recently had a similar problem with a novi 2000 and had to add .125 shims between the head unit and mounting plates. Haven't thrown a belt since!

 

[BlownFiveLiter]

Don't worry about the head unit having too much tension and losing the bearings, it's designed with that in mind. The factory cast crank isn't though, so you do have to use caution when tightening it too much and pulling on the crank, since it can cause one of two problems:

1. Too much lateral tension that breaks the crank snout off
2. Crank walk which breaks the timing set and causes PTV interference and more broken parts.

If you're able to keep the belt reasonably tight where it still has 1/2-1" of play and it doesn't slip, that's as tight as it needs to be, so lock it down.