New Tyres

[BillD.]

I believe the reason for racing boys using nitrogen is that the pressure is more stable than ordinary 'air'

Air contains moisture which does not behave like a 'perfect gas'

Bill D.

 

[Mikey1]

Nitrogen doesnt expand or contract with heat and cold so pressure stays constant

 

[BillD.]

Sorry Mikey, can't agree with that. Charles law states that 'the volume of a perfect gas varies directly with absolute temperature'

Hence my reply above, I think racing people use nitrogen because ambient air is not a perfect gas and the level of tuning is such that they need to be able to make very accurate calculations.

Bill D.

 

[SteveW77]

Nitrogen doesnt expand or contract with heat and cold so pressure stays constant

I don't think this is true, as I have heard several retired F1 drivers comment on the fact that tyre pressures drop when the safety car is deployed, due to the drop in tyre temperature caused by the relatively slow speed.

Steve W

 

[xtrailman]

We had a control system to keep the BOC supply of nitrogen with in our required limits, 18 to 20 bar, so the pressure certainly alters?

We took gas directly off the grid, which was then reduced to our required pressure.

The backup system came from liquid nitrogen tanks, then via controlled vaporizers gas was produced. output pressure was again controlled at 20 bar.

As i understand, normal air can leach through the tyre to atmosphere, while nitrogen doesn't, so pressure is maintained.

 

[xtrailman]

We had a control system to keep the BOC supply of nitrogen with in our required limits, 18 to 20 bar, so the pressure certainly alters?

We took gas directly off the grid, which was then reduced to our required pressure.

The backup system came from liquid nitrogen tanks, then via controlled vaporizers gas was produced. output pressure was again controlled at 20 bar.

As i understand, normal air can leach through the tyre to atmosphere, while nitrogen doesn't, so pressure is maintained.

That is when i was working.

 

[michael_374229077]

We had a control system to keep the BOC supply of nitrogen with in our required limits, 18 to 20 bar, so the pressure certainly alters?

We took gas directly off the grid, which was then reduced to our required pressure.

The backup system came from liquid nitrogen tanks, then via controlled vaporizers gas was produced. output pressure was again controlled at 20 bar.

As i understand, normal air can leach through the tyre to atmosphere, while nitrogen doesn't, so pressure is maintained.

my local tyre dealer uses nitrogen on all new tyres free. I have to admit that over several years they appear to loose less pressure & may well give better performance. But..... surely after re-filling one tyre with air (say after a puncher)this tyre will respond more than the other side (still on nitrogen) to temperature induced pressure increase? This would, I think, result in the siuation whereby after a long run one side would have a significantly higher pressure that the other. Not a safe situation? But then again hardly any worse than having to use a (cost saver) 'space-saver' wheel!