If there is more downforce on the tire , it will deflect more , yust the same as when there is more weight on it.CHT wrote:Using the same theory of a pressure cooker, does anyone know if car with higher down force will increase the tire pressure within the tires and hence affecting the temperature of the tyres?
I found a relation between the surface on the ground of a tire and the deflection of it, and that is quadratical.
so if downforce or weight on tire is for instance 2 times as much then the deflection is 2*2=4 times as much.
Now I state that the deflection is linear to the heatproduction , so if deflection gets 4 times as much then the difference in temperature between inside and outside the tire also 4 times as much.
So to my conclusion downforce affects tires temperature.
But you can bring the temperature back by highening the pressure , so the deflection gets less and so less heatproduction.
Unless you want higher temperature of the treath to get more gripp.
But to much deflection can damage the tires , by to much bending of the sidewalls , wich can cource blow-out and treath coming loose.
Its not the temperature of the treath or inside tire that damages the tire, but the constant bending of the rubber.
This bending produces energy wich is transformed to heat . But you could get an idea of it by the temperature-rising.
So if it is freesing cold outside the inside tire temperature and treath temperature stay lower but the temperature rising will be about the same.
EDIT: reading back I also read about the pressure rising with the temperature rising.
Especially for racing I once made a spreadsheet to play with the temperature and pressue.
In part 1 a simple calculation of the needed pressure with use of the formula the tire-makers in Europe use and is pretty save for standard load and XL tires . In part 2 you can play with the temperature and even outside pressure to see what it does to the pressure. In part 3 you can give pressure rising and cold inside/outside filling temperature to see what the warm pressure is at that moment.
https://skydrive.live.com/?cid=a526e0ee ... E6DC%21793
Can be found in this map on my skydrive that belongs to my hotmail adress.
First download the pressurecalculationwithtemp spreadsheet by RIGHTCLICKING on it and then choose download.
Dont leftclick or use open in Excell or Web-app , to complicated or goes wrong and you damage the file. If damaged you can get the old back by version history .
After download open in Excell or Open Office CALC to use it.
Will give a picture for a bit higher pressure then used here
for motorhomes.In that I also calculated the pressure rising and swiched warm and cold pressure , so you can see how you can manipulate the spreadsheet for your need.
