Hurtle Posted August 10, 2007 Share Posted August 10, 2007 While picking up my tin top after a service last night, I was offered Nitrogen for my tyres. Has anyone tried this in there 7s, apparently you get a uniform tyre pressure regardless to what the air or tyre temperature is. Price £1.75 per tyre. Jas. Link to comment Share on other sites More sharing options...
irrotational Posted August 10, 2007 Share Posted August 10, 2007 here --- this is a local sig for local people! Link to comment Share on other sites More sharing options...
neil.cavanagh Posted August 10, 2007 Share Posted August 10, 2007 what an absolute load of carp!!! Air is 71% nitrogen anyway. Plus Bohls law says that if you keep the volume constant and increase the temperatue of a gas the pressure goes up. So the comments on the other thread about pressure not changing with temp are tosh. Ok no moisture will mean slightly less change, but not zero change. Just a great way for the garage to try and make some easy money. Link to comment Share on other sites More sharing options...
Hurtle Posted August 10, 2007 Author Share Posted August 10, 2007 The equipment cost him £10000 thats a lot of £1.75s to make back. Link to comment Share on other sites More sharing options...
AMMO Posted August 10, 2007 Share Posted August 10, 2007 I ran Nitrogen in my race bike tyres in the early '90's. Only because one of our sponsors provided the bottle and regulator for free. It was easier to carry in the van than a compressor. We didn't find any difference in running good old fashioned compressed air after that. If I though there was an advantage in using it we would have paid for it but it was never on our shopping list. AMMO Link to comment Share on other sites More sharing options...
Tony C Posted August 10, 2007 Share Posted August 10, 2007 Nitrogen is dry, compared to air. It's molecular "structure" is larger than that of oxygen, so the tyre will leak gas at a slower rate. I thought the slower leakage was a leg-pull, but is apparently true. Being inert is also an advantage, but is not really practical BRG Brooklands SV 2.0L Ammo Duratec 😬 It seems that perfection is achieved not when there is nothing more to add, but when there is nothing more to take away. (Antoine de Saint-Exupery) Link to comment Share on other sites More sharing options...
neil.cavanagh Posted August 10, 2007 Share Posted August 10, 2007 FFS... air is 78.08% (roughly!!) Nitrogen anyway!! here or here Link to comment Share on other sites More sharing options...
Irrelevant Posted August 10, 2007 Share Posted August 10, 2007 Wow . .. . didn't realise there was such a simple way to improve the performance of my tyres and stop them from going flat - those air molecules always seem to leak out of my tyres . . . Maybe, just maybe, the bigger Nitrogen molecules will be so big they'll automatically seal any small punctures I get There's obviously a lot more to filling tyres with Nitrogen that filling them with that old fashioned air stuff - it wouldn't cost £10K for the equipment otherwise. I'm off to find a garage now before they run out of Nitrogen Link to comment Share on other sites More sharing options...
Paul McKenzie Posted August 10, 2007 Share Posted August 10, 2007 I'm going to fill mine with Helium to reduce unsprung weight Paul Link to comment Share on other sites More sharing options...
Hurtle Posted August 10, 2007 Author Share Posted August 10, 2007 Its Begining to sound a little like Peckham Spring Water. 😬 Link to comment Share on other sites More sharing options...
7 wonders of the world Posted August 10, 2007 Share Posted August 10, 2007 Larger moledules and dryer are the 2 main benefits, a lot of the F1 guys used to run it, probably still do. Link to comment Share on other sites More sharing options...
wag Posted August 10, 2007 Share Posted August 10, 2007 'I'm going to fill mine with Helium to reduce unsprung weight' Do you thing the extra reduction in unsprung weight from filling with hydrogen is worth the explosion risk? Link to comment Share on other sites More sharing options...
Paul McKenzie Posted August 10, 2007 Share Posted August 10, 2007 No, this is a Caterham not the Hindenburg Paul Edited by - Paul McKenzie on 10 Aug 2007 13:00:16 Link to comment Share on other sites More sharing options...
Jason Plato Posted August 10, 2007 Share Posted August 10, 2007 as I said 3 years ago there is a benifit in the reduced air pressure increase vs temperature on track that adds to consistency, but on the road it aint worth nowt Link to comment Share on other sites More sharing options...
Onion Boy Posted August 10, 2007 Share Posted August 10, 2007 🙆🏻Snake oil. Universal gas equation. PV =nRT R is the gas constant. Assuming that the volume of the tire V is constant, as is n, the number of gas molecules in the tyre. Thus the pressure in the tyre is proportional to the temperature, irrespective of the gas concerned, be it air, nitrogen, helium or extraordinarium ( i can sell you this for £5 per tyre.) I will concede that dry gas probably better than wet because at the sort of temperatures tyres operate at water is a vapour rather than a true gas, but if you are filling your tyres at 25 celcius and the air is fully saturated with water the water vapour is only contributing 0.03 atmospheres (0.45 PSI) Gosh i feel better now 😬 😬 Nigel Link to comment Share on other sites More sharing options...
stevefoster Posted August 11, 2007 Share Posted August 11, 2007 Adam, Why don't you just over inflate all your tyres by ~30% and let the other rubbish leak out just leaving the all important Nitrogen? 🤔 Hants (north) / Berkshire club here Area meeting pics here My Racing here Link to comment Share on other sites More sharing options...
Roadsport06 Posted August 12, 2007 Share Posted August 12, 2007 Looking at the covalent radius for nitrogen vs. oxygen, there is little difference, so leakage time for nitrogen vs. air is going to be about the same. BRG and Yellow nose VU06 XZX Link to comment Share on other sites More sharing options...
irrotational Posted August 12, 2007 Share Posted August 12, 2007 Nitrogen does seem pretty big though! See:- here --- this is a local sig for local people! Link to comment Share on other sites More sharing options...
DMT Posted August 12, 2007 Share Posted August 12, 2007 Maybe we could just fill the tyres with hot air to negate the warming up bit altogether...... There seems to be plenty of it around here so should be realitivly cheap! Link to comment Share on other sites More sharing options...
susser Posted August 12, 2007 Share Posted August 12, 2007 I use something even better than Nitrogen; It's an exotic mix of gasses which include Nitrogen (78%), Oxygen (20%),Helium Argon, a spash of Krypton to help the turn in and a bit of Xenon to help through those wobbly bits, and I can get it by the bucketload. I find my grip is a lot better than it was before I fitted it. Link to comment Share on other sites More sharing options...
Paul Formston Posted August 13, 2007 Share Posted August 13, 2007 Hi Lads we all ways use Nitrogen in the Aircraft Tyres as there is no Oxygen in it, less chance of blow out when the tyres get hot but in a Caterham its a bit OTT Regards Paul Link to comment Share on other sites More sharing options...
Colin Mill Posted August 13, 2007 Share Posted August 13, 2007 Susser Have you increased the CO2 content to 390ppm in line with current best practice? 😬 Link to comment Share on other sites More sharing options...
susser Posted August 13, 2007 Share Posted August 13, 2007 Colin I left that bit out to see if anyone would pick it up. Well done ! Link to comment Share on other sites More sharing options...
Roadsport06 Posted August 13, 2007 Share Posted August 13, 2007 Susser, its funny that we have never met but I use the same, and like Colin I too have increased my percentage of carbon dioxide. If anyone wants any of this mixture I can send you some at a good price 😬 BRG and Yellow nose VU06 XZX Link to comment Share on other sites More sharing options...
Old Git Posted August 13, 2007 Share Posted August 13, 2007 Lot of valid points up there - agree a 100% nitrogen fill will help to maintain pressures - may be some thermal advantages also. But as the guy above says, fresh air is 80% nitrogen anyway. Your call!! Tim N Link to comment Share on other sites More sharing options...
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