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Friction material on centerlock wheel mating surfaces?
I have a tube frame GT car that uses March 87C Indycar centerlock uprights and hubs. I think I've mostly solved an issue I had at first with the centerlock wheel nuts coming loose, thanks to help here on the forum (thread here). I am still seeing evidence of some back and forth rotational movement on the rear wheels due to the braking and acceleration cycles, even with the wheel nuts holding their torque. One thing I've noticed is there appears to be a lightly textured material applied to the mating surface on the hub side. Maybe friction material to resist rotational movement?
See pics below. The first one shows the material on one of the front hubs (actually rotor hats) - see the dark circle in line with the drive/locating pins. It's pretty much intact on the front still. The second pic shows the rear where it's mostly worn off, presumably due to the repeated braking and acceleration cycles.
I'm wondering if I should look into re-applying the friction material to the rear mating surfaces. Anyone know what this stuff is? Plasma spray coating?
Thanks for any input!
https://www.apexspeed.com/forums/att...id=97638&stc=1
https://www.apexspeed.com/forums/att...id=97639&stc=1
Slightly different thought...
Working back and forth due to unavoidable slop in the drive pins is, IMO, a combination of 4 things:
o Acceleration torque (exacerbated by losing traction over bumps)
o Braking torque (exacerbated by losing traction over bumps)
o Friction coefficient between wheel and hub (what you are asking about)
o Centerlock wheel nut clamping tension
So while your question is, IMO, valid, you may be able to improve the situation by reducing friction coefficient (lube or low-friction plating) between the nut either on its mating face (1st choice) and/or the hub threads (not as good because nut might work loose), thus increasing clamping tension.
Just something more to think about.