Garage equipment, Automotive repair and maintenance

Why do we need nitrogen machine ?

The subject of using nitrogen to inflate car tyres has received considerable publicity over the past few years; particularly since some tyre retailers have begun promoting its supposed benefits.

It is well known that nitrogen gas has been used to inflate the tyres of racing cars, aircraft and heavy commercial vehicles for some time. However it is only relatively recently that it has come into use in normal passenger cars.

Nitrogen is a colourless, odourless, tasteless, and non-toxic gas that forms about 78% of the Earth’s atmosphere. The benefits claimed for using nitrogen over compressed air for inflating tyres are that it:

Reduces the tyre’s running temperature

While there is some truth in this statement, the difference relates to the moisture content of the inflation gas rather than the use of nitrogen per se. In fact, dry compressed air will also produce a cooler running tyre. It’s also only likely to be of benefit in cases where the tyres are operating at or near their maximum load and/or speed capacities.

Nitrogen improves ride quality

No explanation has been offered as to why this should be the case. There should be no significant difference in the way air and nitrogen behave at normal tyre operating pressures and temperatures.

Nitrogen increases tyre life

A tyre’s operating temperature plays a part in how rapidly it will wear. A reduction in temperature at high speeds and loads will be beneficial. However claims by some supporters that nitrogen will double tyre life are questionable.

Reduced pressure build up

The reason that tyre pressures should only be checked when cold is that the tyre’s inflation pressure increases in relation to temperature. Nitrogen is claimed to provide a more stable pressure range in relation to tyre temperature. However once again the moisture content of the inflation gas plays a bigger part than the gas itself. Any benefits are likely to be achieved only under heavy load and/or high-speed conditions.

Pressure loss is slower with nitrogen than with air

Tyre liners and tubes are to some degree porous, and as a result air will eventually leach out. Hence the need to regularly check tyre pressures, Nitrogen, due to its chemical structure, is slower to leak out than compressed air. Therefore the pressure loss is slower. However that doesn’t mean that regular pressure checks can be neglected as there is still the possibility of a puncture or some other form of slow leak.

Nitrogen doesn’t react with the metal wheel rim or the tyre materials

Probably true. The presence of oxygen and moisture inside the tyre can cause oxidisation (rust) of the metal components. There is also a suggestion that air reacts with the rubber of the tyre itself, however it is not clear if this is detrimental or in any way reduces the life of the average car tyre. Because nitrogen is a relatively inert gas (though not a member of the ‘noble’ gas family) and because it is dry, this problem is, in theory, eliminated. However, unless the tyre is evacuated (i.e. the air is removed) before the nitrogen is added, there will still be some air and possibly moisture in the tyre.


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2 comments

  1. KO SU KIE
    2015/05/14 at 09:05:08

    Hello,

    I am from Tangerang indonesia,I am interested in your products as seen on the web,including Tire Nitrogen Machine、

    Two Post Car Lifts. The model of my interest is ST-35N2P/ST-36N/ST-60NZP/ST-70N/ST-2D-50E

    Please confirm to me if you are in charge of sales as we are in need of the attached products specified below.

    Kindly check and quote me your best price and furnish me with the following information.

    1. M.O.Q
    2. FOB Shanghai
    3.The detail introduction of product

    Awaiting your response.

    KU SO KIE

  2. sisubalan,k,s
    2013/10/15 at 07:49:15

    Need Qutation very soon as soon as posible Nitrogen air unit

    by
    sisubalan.k.s.
    service manager. statndard tvs gobi tamilnadu

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