Wheel weights won't stay on track tires
03-14-2008, 08:35 PM
#46
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Somebody waaay smarter than I once explained it to me this way:
Radiant heat from the brake rotors gets the lead weights hot, and the heat in the lead weights seeks to dissipate to the larger, cooler aluminum (or steel) wheels. The foam double backed tape is insulating the lead weights from the wheel (heat sink), and the weights get hotter than the foam tape can tolerate, so the heat energy essentially melts it's way through the foam tape as it seeks a way to get to the dissipating material of the wheel.
The HVAC tape, though thin, is an effective insulator from the radiant heat, so the weights don't get much hotter than the wheels - a temperature range which the foam tape can tolerate.
Makes sense to a dumb guy like me.
Thermal engineers can correct as necessary.
Radiant heat from the brake rotors gets the lead weights hot, and the heat in the lead weights seeks to dissipate to the larger, cooler aluminum (or steel) wheels. The foam double backed tape is insulating the lead weights from the wheel (heat sink), and the weights get hotter than the foam tape can tolerate, so the heat energy essentially melts it's way through the foam tape as it seeks a way to get to the dissipating material of the wheel.
The HVAC tape, though thin, is an effective insulator from the radiant heat, so the weights don't get much hotter than the wheels - a temperature range which the foam tape can tolerate.
Makes sense to a dumb guy like me.
Thermal engineers can correct as necessary.And Jupe was talking about hair spray on the beads......same question?
03-14-2008, 11:29 PM
#47
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Right, like I said brake less, compress braking, etc, to reduce the amount of heat that soaks into the wheels. The same amount of work is done, so the same amount of heat energy is created, if you brake over 500 feet or 250 feet from and to the same speed. The difference is that if you do it over a shorter period, it doesn't soak into the wheel/hub/axle as much.
03-16-2008, 11:55 AM
#48
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Clean wheels and alot of tape should = weights staying put.
03-16-2008, 01:03 PM
#49
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That's why they make special wheel weights for racing. It doesn't have the foam tape backing; it's this black stuff. I sell it if anyone needs some.
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Larry Herman
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Larry Herman
2016 Ford Transit Connect Titanium LWB
2018 Tesla Model 3 - Electricity can be fun!
Retired Club Racer & National PCA Instructor
Past Flames:
1994 RS America Club Racer
2004 GT3 Track Car
1984 911 Carrera Club Racer
1974 914/4 2.0 Track Car
CLICK HERE to see some of my ancient racing videos.
03-16-2008, 07:23 PM
#50
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two layers of ally tape -- no problems! Be careful where the weights are placed if your calipers are close to the rim.
I have had both front and rear tires rotate on the wheels. We brake at much greater rates than we accel -- I would think rear tires would be more prone to rotating on the wheels, same bead friction as the fronts, more road friction at the rear. Then again, the fronts see more brake force than rears.
I always mark the tires location relative to the wheel, near the valve stem. Tires that are mounted recently to track days can still be wet with bead setting goo. My observations anyway.
I have had both front and rear tires rotate on the wheels. We brake at much greater rates than we accel -- I would think rear tires would be more prone to rotating on the wheels, same bead friction as the fronts, more road friction at the rear. Then again, the fronts see more brake force than rears.
I always mark the tires location relative to the wheel, near the valve stem. Tires that are mounted recently to track days can still be wet with bead setting goo. My observations anyway.
