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| | #61 (permalink) |
| Newbie Join Date: Nov 2004 Location: baroda
Posts: 34
| Air is 78% nitrogen, N2, and 21% oxygen, O2. So even if you put air in the tire, it's already 78% nitrogen. Many of the so called nitrogen generators don't produce much more than 90% nitrogen.
__________________ sn48001 |
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| | #62 (permalink) | |
| BHPian | Quote:
the advantages quoted are way too optimistic but aint a bad deal for 15 bucks will try it out soon | |
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| | #63 (permalink) | |
| Senior - BHPian | Quote:
__________________ "She may not look like much, but she's got it where it counts, kid." | |
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| | #64 (permalink) |
| Senior - BHPian | It is Rs.50/- per tyre in Kochi/Cochin per tyre for full nitrogen filling (let-out all air, refill completely with Nitrogen). Top-ups are free. (I've topped-up 4-5 times so far. Available only in Global Tyres, near Popular, Mamangalam right now.
__________________ Αυτο ειναι ολα τα ελληνικα μου |
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| | #65 (permalink) | |
| Senior - BHPian | Quote:
Now, is the 15Rs one and the 50Rs one the same thing?
__________________ "She may not look like much, but she's got it where it counts, kid." | |
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| | #66 (permalink) |
| Newbie Join Date: Nov 2004 Location: baroda
Posts: 34
| At relatively low pressures (ie tyre pressures) N2, O2 and water vapor will all behave as ideal gases, and follow PV=nRT. Pressure will increase or decrease to the same extent as the temperature increases or decreases regardless of which gas is in the tire. (Even at 300 psi, which is about 20 atm, there is little deviation from ideality.) Therefore the comments about N2 not changing in pressure as the temperature changes are without merit.
__________________ sn48001 |
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| | #67 (permalink) | |
| BHPian | Quote:
And what you have said about 90% purity of nitrogen is not true as even the most commercial nitogen available is 95% pure.
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| | #68 (permalink) |
| Newbie Join Date: Nov 2004 Location: baroda
Posts: 34
| If moisture content is the culprit, a moisture separator attached to the compressor would do the same job. The cost of installing a separator is fraction of the cost of nitrogen generator.
__________________ sn48001 |
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| | #69 (permalink) |
| Newbie Join Date: Nov 2004 Location: baroda
Posts: 34
| The rate of diffusion of a gas through a porous membrane depends on the molar mass and to some degree on the molecular diameter. N2 and O2 are almost the same size and N2 is lighter than O2, so if either gas were to diffuse out of the tyre, nitrogen would do it more quickly. Luckily, tyres are designed not to be porous membranes.
__________________ sn48001 |
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| | #70 (permalink) | |
| BHPian | Quote:
Also the point of N2 being lighter than O2 is correct. It being lighter is the reason that the ride quality is much better than that of O2. And you have very rightly pointed out that the tyres are not porous. This sadly is a very popular misconception among people who think that tyres are porous. If they were then we would find tons of water in our tyres.
__________________ I'm loving it. Last edited by vikram_d : 10th January 2007 at 10:40. | |
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| | #71 (permalink) |
| Newbie Join Date: Nov 2004 Location: baroda
Posts: 34
| Nitrogen is used in racing cars for three main reasons. 1) Even a small variations in tyre pressure due to moisture would be crucial to wining the race. 2) These tyres are heated up tremendously during the race that tyres may tend to flame out. So nitrogen would retard any such flame outs. 3) Using Highly compressed nitrogen cylinders in the pit for operating various pnuematic tools is easier than having a compressor running.
__________________ sn48001 |
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| | #72 (permalink) |
| Senior - BHPian Join Date: Oct 2005 Location: Currently at Chennai. Originally from Blore.
Posts: 1,483
| I've filled in nitrogen in my new Michelin XM1 tires. I feel nitrogen doesnt heat the tires as much as regular air does... I also heard that the pressure remains constant for as much as 6 months, as nitrogen is less volatile than free air... but i may beg to differ.... here's why.... i got these mich's in november... all 4 tires filled with nitrogen and the spare JK tubetype also filled with nitrogen... Yesterday i went for a top-up of nitrogen as i felt one of the tires looked underinflated (front Left tire). And it was... 5 psi less... FR tire - 2-3 psi less.... Spare tire had no change in psi whatsoever.... Surprising.... the other tubeless tires also were down by a psi or two... i must admit that i hadn't used the car for 2 weeks.... but then.. we dont use the spare regularly so why the leakage only from the tubeless? now for experts... is it recommended to check every month like we normally do? or we just let is be cos it's got nitrogen? P.S. also if i have a puncture... how many days does it take for the tubeless to go completely or almost flat...???
__________________ Avoid hangover's.... Stay drunk !!! Yella OK, Cool Drink Yaake ??? |
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| | #73 (permalink) | |
| BHPian Join Date: Jul 2006 Location: Bombay
Posts: 394
| Quote:
It could also be a valve issue. Using good quality valves is very important for tubeless. | |
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| | #74 (permalink) | |
| BHPian | Quote:
__________________ I'm loving it. Last edited by vikram_d : 11th January 2007 at 10:14. | |
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| | #75 (permalink) |
| Senior - BHPian Join Date: Oct 2005 Location: Currently at Chennai. Originally from Blore.
Posts: 1,483
| Thanks Vikram.... Will monitor the pressure for sometime... BTW the wheels are all alloys which were OE fitment from Maruti (Limited edition esteem). I think it is either an issue with valves or a puncture... will check and post findings. Thanx guys.
__________________ Avoid hangover's.... Stay drunk !!! Yella OK, Cool Drink Yaake ??? |
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the other tubeless tires also were down by a psi or two... i must admit that i hadn't used the car for 2 weeks.... but then.. we dont use the spare regularly so why the leakage only from the tubeless?
