Re: !!! LET Motorsports Pulley Failure !!!
I have two cermaic bearings, that are double sealed, the same size & dynamic load and are greased rated to 19,500 RPM - being shipped to me today.
To re-evaluate some of the possible solutions so far - and keep in mind that the stock idlers in a non-modified engine also tend to fail - but not at the premature rate we're seeing.
1) Re-install the stock idler pulley, torque to 15-20 ft lbs. & source a larger belt. See this link for calculated RPM rates: <link>
2) Install a 6303 bearing (un-shielded or shielded one side) and re-pack with quality PTFE grease that you can source in a small tube and re-apply without removing the bearing. - If you look at the pictures on the first post - that bearing looks real dry... but that's the major issue using an unsealed bearing.
3) Buy a double-sealed bearing (just like our factory idler) but one that's custom (Cermaic -or- Stainless) and capable of operating at RPM's beyond the speed your crank pulley will be spinning it and with the same dynamic load rating.
I'm choosing #3. Ceramic bearing on the way, stainless bearing from LET (for back up) - - Then if all else fails I'll go with #1
Last edited by BrianBrave; Nov 25, 2008 at 09:48 AM.