Discussion Overview
The discussion revolves around the temperature range experienced by car wheels, specifically the brake rotors and hub, during hard braking on both street and race track conditions. Participants explore the factors influencing heat transfer and the resulting temperatures encountered by the wheel face.
Discussion Character
- Technical explanation
- Experimental/applied
- Debate/contested
Main Points Raised
- Some participants inquire about the heat transfer from the brake rotor and hub to the wheel, suggesting that the rim hub acts as a heatsink.
- One participant notes that the temperature of the rim hub can vary significantly based on conditions such as aerodynamics, mass, shape of the rim, and braking frequency.
- Another participant emphasizes that the rim will generally be at a lower temperature than the rotor hub, and mentions the complexity of modeling the heatsink problem due to various influencing factors.
- A participant provides an example from NASCAR, stating that brake rotors can exceed 1400 to 1500 degrees Fahrenheit during races, leading to high temperatures in the wheels and tire beads, supported by the use of cooling fans and ducts.
- Street car brake temperatures are mentioned to typically reach up to 300 degrees Celsius, as indicated by brake pad manufacturers.
Areas of Agreement / Disagreement
Participants express varying opinions on the specific temperature ranges and influencing factors, indicating that multiple competing views remain without a consensus on exact temperatures or conditions.
Contextual Notes
Limitations include the dependence on specific vehicle designs, driving conditions, and the complexity of heat transfer modeling, which remains unresolved in the discussion.
