Ron, Where does the C5/C6/Z06 Etc. sealed bearing assembly fit into this equation? The GM guys have the luxury of going with a ATS spindle that utilizes a c6 bearing pack. I know mine were still tight when I sold my car. Not that much road racing time, however.
Hey Todd,
They are a good option too. I covered it in another post. Go HERE .. and scroll down to post #444.
A post I did on bearing thrust load capacities is here.
A post showing my new Track-Star hubs & the bearing size differences start on THIS PAGE. Be sure to read from post #427 to post #438.
The size & mass of the bearings define their ability to handle thrust loads ... and heat. A front hub bearing is a lot like a brake rotor. The larger it is the better its mass can handle the heat generated. The smaller it is, the higher the temps get & you get grease burn out.
The photos below show the sizes of bearings for reference.
Far left: Timken LM11949 rated at 917# thrust load. (Most GM 58-78, Ford 55-69 & Chrysler 55-72) 2nd from left: Timken LM12748 or LM12749 rated at 922# thrust load. (GM 82+, Ford 70-89) 3rd from left: Timken LM12649 rated at 1130# thrust load. (GM B-body & 1/2T trucks & Ford some HD apps 63-72) Far right: Timken 2687 rated at 1800# thrust load. (Road Course & Oval Race Cars)
Interesting stuff.. I went and checked my bearings today. It has PN LSB M12649 outter bearings on it
__________________
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They are a good option too. I covered it in another post. Go HERE .. and scroll down to post #444.
:Cheers:
Hey Ron,
To the best of my knowledge there are three C5/C6 hubs: the standard C6, the Z06 which LG Motorsports sells with the larger rear bearing and the ZR1 which I believe is still only available at the dealer. I could be wrong, but as far as I can tell the ZR1 is the same as the Z06 with the exception of the ABS sensor and inner spline count. Do you know if the load rating is any different for these hubs?
To the best of my knowledge there are three C5/C6 hubs: the standard C6, the Z06 which LG Motorsports sells with the larger rear bearing and the ZR1 which I believe is still only available at the dealer. I could be wrong, but as far as I can tell the ZR1 is the same as the Z06 with the exception of the ABS sensor and inner spline count. Do you know if the load rating is any different for these hubs?
Hey Ron,
Yes, in that bearing you're referring to, the outer bearing is larger than the inner bearing & it is stronger. This makes the hub rated higher overall. But the weakest bearing is always the bearing that fails, regardless if it's on the inside or outside. The small one in the Z51 bearing is the same size as before, rated at 1060#.
As I mentioned in a previous thread, the bearing engineer I work with said this bearing will wear quicker than the big bearing stuff we're used to racing. So if you check the wheel/hub play & it starts to show excessive, simply replace it. If that happens often, then maybe you need a stronger spindle/bearing/hub assembly. If not, you're probably fine.
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
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