I agree it it each to their own but I'm happy with Nitrogen
Fair enough
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I agree it it each to their own but I'm happy with Nitrogen
Well my new thread sure started something, I'll go with the 'nitrogen is better' brigade.
I can assure you that after 32 years in professional motorsport it's not.£1.50 a pop is well worth it more stable pressure for longer and hence improved mpg
Nitrogen does not accept moisture like normal air does so it keeps the pressures more constant.
Thats all.
You will notice your pressure remain very stable when checking them week after week.
Rough calculation but when you put a tyre on a rim and before you pressurise it (using nitrogen) it contains air. Atmospheric pressure is ~ 15 psi and tyre pressure of 30 psi means doubling the pressure means doubling the (uncompressed) volume of gas in the tyre. So you end up with a 50/50 split of air and nitrogen - or around 90% nitrogen instead of 80% had you just filled it with air.
As it's so critical in motorsport do you take steps to 'blow out' the air in the unpressurised tyre and if so how?
Serious question by the way - I suspect for the majority of drivers it's of little consequence but on a race track where 100ths of a second can split cars I can see why you'd want to do it!
Rough calculation but when you put a tyre on a rim and before you pressurise it (using nitrogen) it contains air. Atmospheric pressure is ~ 15 psi and tyre pressure of 30 psi means doubling the pressure means doubling the (uncompressed) volume of gas in the tyre. So you end up with a 50/50 split of air and nitrogen - or around 90% nitrogen instead of 80% had you just filled it with air.
As it's so critical in motorsport do you take steps to 'blow out' the air in the unpressurised tyre and if so how?
Serious question by the way - I suspect for the majority of drivers it's of little consequence but on a race track where 100ths of a second can split cars I can see why you'd want to do it!
I don't get that at all. Surely with a normal tubeless road tyre any kind of vacuum inside would cause it to pull away from the rim ... there would be no sealWhen you fit a new tyre or have air replaced by nitrogen in a tyre, the correct way is to suck out the air then refill with nitrogen rather than blow the air out.
When you fit a new tyre or have air replaced by nitrogen in a tyre, the correct way is to suck out the air then refill with nitrogen rather than blow the air out.
I accept you can never remove all the air but suspect you can have < 1% oxygen in a nitrogen fill which will make a difference
When you fit a new tyre or have air replaced by nitrogen in a tyre, the correct way is to suck out the air then refill with nitrogen rather than blow the air out. The kit that does this is incredibly expensive and not many people have it usually professional motorsport outfits or high end tyre fiters. Once you have got the nitrogen fill it's only a matter of topping up and checking from an OFN bottle.
I accept you can never remove all the air but suspect you can have < 1% oxygen in a nitrogen fill which will make a difference
I don't get that at all. Surely with a normal tubeless road tyre any kind of vacuum inside would cause it to pull away from the rim ... there would be no seal
The procedure for making a vessel (or tyre) inert is to pressure up to say 3 bar with nitrogen, depressure and repeat about three times. Each time reduces the oxygen content by 75%. Increase the pressures or the number of inflations as required.
No need for any special equipment as nitrogen is usually the cheapest option.
I don't get that at all. Surely with a normal tubeless road tyre any kind of vacuum inside would cause it to pull away from the rim ... there would be no seal
Nope as I said you can't suck all the air out, so the machine sucks it out to a given limit so the tyre doesn'e distort or pull away from the rim and then automatically fills with nitrogen, repeated cylce filling with nitrogen I guess is just the cheap way of doing it but probably has the same effect.
I can only speak for kit I have seen used in motorsport
Is this the type of kit you're referring to Ian?
Uniflate - Nitrogen Tyre Inflation - Nitrogen News
I don't think so it's not clear from the spec sheet but I think this may be one of the units fed by compressed air to produce nitrogen fill, the units I have seen are fed on bottled OFN and I know for sure the units used by the Ferrari F1 team are from Snap On as are all the teams tyre changing and balancing machines, as we have exactly the same. But we don't have initial nitrogen fill we use a local company for that due to the excessive cost of the equipment.
Is this the type of kit you're referring to Ian?
Uniflate - Nitrogen Tyre Inflation - Nitrogen News
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