Mix nitrogen and regular air in tires?

Discussion in 'The Garage' started by JEDI, Oct 30, 2007.

  1. JEDI

    JEDI Lifer

    Joined:
    Sep 25, 2001
    Messages:
    23,106
    Likes Received:
    2
    i bought bf goodrich traction t/a's today from costco.

    they use nitrogen (free), but fills only to manufacturer's psi. (32psi on my mazda3 16" wheels)

    i usually fill to 40psi. it gives better gas milage.

    so is there any downside to mixing nitrogen and regular in tires?

    edit:
    meant oxygen, not pure o2.

    edit2:
    sigh,,, regular air
     
  2. Dman877

    Dman877 Platinum Member

    Joined:
    Jan 15, 2004
    Messages:
    2,710
    Likes Received:
    0
    Isn't air like 70% nitrogen anyway? I don't think there would be a problem :).
     
  3. getbush

    getbush Golden Member

    Joined:
    Jan 19, 2001
    Messages:
    1,771
    Likes Received:
    0
    What are you talking about 02 for? Are you thinking of stealing your grandpas oxygen for your tires?
     
  4. Blackjack200

    Blackjack200 Lifer

    Joined:
    May 28, 2007
    Messages:
    11,954
    Likes Received:
    2
    Air is 78% nitrogen and 21% Oxygen. Essentially, a mixture of nitrogen and O2. If there is a downside to it, millions of cars are going to have major problems.
     
  5. Toastedlightly

    Toastedlightly Diamond Member

    Joined:
    Aug 7, 2004
    Messages:
    7,175
    Likes Received:
    0
    all cars do eventually break
     
  6. Pacfanweb

    Pacfanweb Lifer

    Joined:
    Jan 2, 2000
    Messages:
    12,891
    Likes Received:
    1
    Nitrogen in tires is a major ripoff if anyone paid for it. Do some google searching and you'll find out.

    To answer your question: No, it won't hurt to top it off with air.
     
  7. jagec

    jagec Lifer

    Joined:
    Apr 30, 2004
    Messages:
    24,442
    Likes Received:
    0
    Why buy high-traction tires, and then overfill them to give up the traction advantage?

    But no, putting air in your tires isn't going to hurt them.
     
  8. AMCRambler

    AMCRambler Diamond Member

    Joined:
    Jan 23, 2001
    Messages:
    7,653
    Likes Received:
    0
    Yeah, overinflating your tires is putting less rubber in contact with the road. Why don't you just buy thinner tires and inflate to 32psi?
     
  9. nakedfrog

    nakedfrog Lifer

    Joined:
    Apr 3, 2001
    Messages:
    42,586
    Likes Received:
    19
    What's the max PSI on those tires?
     
  10. Ktulu

    Ktulu Diamond Member

    Joined:
    Dec 16, 2000
    Messages:
    4,355
    Likes Received:
    0
    I though over inflating caused tires to wear out unevenly.
     
  11. Vette73

    Vette73 Lifer

    Joined:
    Jul 5, 2000
    Messages:
    21,505
    Likes Received:
    0

    It causes the middle to buldge. Since you are running on less tire then there is less restiance so milage might improve some. Look at Hybrids and see how small their tires are.

     
  12. jaedaliu

    jaedaliu Platinum Member

    Joined:
    Feb 25, 2005
    Messages:
    2,671
    Likes Received:
    0
    ride gets bumpier too. I tend to go under 3 or 4 psi when I get them checked. Smoother ride. My mileage suffers a bit, but only by 10% or so.
     
  13. GoatMonkey

    GoatMonkey Golden Member

    Joined:
    Feb 25, 2005
    Messages:
    1,254
    Likes Received:
    0
    You'll have a nice bald patch on the middle of your tires and have to replace them sooner, completely canceling out any MPG advantage you might have gotten. Plus they may have a higher chance of blowing out with increased PSI.

    I had a friend who filled his car tires to 60 PSI because that's what he had always used on his bicycle.
     
  14. JEDI

    JEDI Lifer

    Joined:
    Sep 25, 2001
    Messages:
    23,106
    Likes Received:
    2
    44psi
     
  15. jagec

    jagec Lifer

    Joined:
    Apr 30, 2004
    Messages:
    24,442
    Likes Received:
    0
    Oxygen IS pure O2:confused:
     
  16. YetioDoom

    YetioDoom Platinum Member

    Joined:
    Dec 12, 2001
    Messages:
    2,162
    Likes Received:
    0
    I think he means air.
     
  17. JEDI

    JEDI Lifer

    Joined:
    Sep 25, 2001
    Messages:
    23,106
    Likes Received:
    2
    sigh,,, regular air
     
  18. SecPro

    SecPro Member

    Joined:
    Jul 17, 2007
    Messages:
    147
    Likes Received:
    0
    Filling your tires to the max pressure listed on the sidewall will not cause your tires to wear much differently than if you inflate them to factory reccomended pressures. Rotation is the key to long tire life. Factory pressures are based on several factors, ride smoothness being one of the biggest contributors. I've always ran pressures above the factory recommended (but not above the max) and never had any problems. The rides a little harsher but the MPG is better and I think they handled better. Didn't feel mushy. YMMV.

    and yes you can top those tires off with regular "air" at a gas station.
     
  19. WolverineGator

    WolverineGator Golden Member

    Joined:
    Mar 20, 2001
    Messages:
    1,011
    Likes Received:
    0
    SecPro is right. Like other posters above I thought high pressures would cause uneven wear, a harsh ride, and poor traction. I have experienced none of those things and I run my tires at 50 psi for the gas mileage improvement. The tires are wearing evenly and have about half their useful life remaining.
     
  20. thomsbrain

    thomsbrain Lifer

    Joined:
    Dec 4, 2001
    Messages:
    18,149
    Likes Received:
    0
  21. JEDI

    JEDI Lifer

    Joined:
    Sep 25, 2001
    Messages:
    23,106
    Likes Received:
    2
    thx for explaination troll
     
  22. Jahee

    Jahee Platinum Member

    Joined:
    Sep 21, 2006
    Messages:
    2,082
    Likes Received:
    0
    Out of interest.. What kind of mileage increase do you get from running them at 40 rather than 32 PSI?
     
  23. Uhtrinity

    Uhtrinity Platinum Member

    Joined:
    Dec 21, 2003
    Messages:
    2,091
    Likes Received:
    0
    Moisture free or dry nitrogen is used to fill cavities in high end and military grade optics. Someone probably got the idea to use low moisture nitrogen to reduce the chance corrosion to the wheels, but for it to work you would have to purge out all of the 'wet' air. Other than that it just sounds like a fad. Fyi, I run my Insights tires at 45 psi, which is within the upper psi range of the tire, some guys go as high as 50 - 60psi.
     
  24. JulesMaximus

    JulesMaximus No Lifer

    Joined:
    Jul 3, 2003
    Messages:
    71,865
    Likes Received:
    75
    What an idiot.

    BTW-Here is some information on tire inflation.

    NEVER INFLATE TO MAXIMUM TIRE PRESSURE!

    There is a common misunderstanding that a tire's pressure is stamped on the sidewall. In actuality, this pressure stamped on a tire's sidewall is the MAXIMUM COLD PRESSURE that the tire will safely hold.

    Many tires are rated for a maximum cold pressure of 44 psi, to allow the tires to be used on a wide variety of vehicles. Some vehicles may only require 30 psi cold pressure, others may require 38 psi cold pressure. In both cases, this cold pressure is less than the tire's MAXIMUM cold pressure, so the tire can safely be installed on these vehicles.

    Tires should be inflated according to the manufacturer's cold specifications, not the maximum pressure stamped on the sidewall of the tire.

    Over-inflated tires, even those inflated to maximum pressure, will cause problems with ride comfort, stability and handling, uneven wear, and potential tire failure.

    Under-inflated tires will also cause these same problems, but under-inflated tires have greater potential for tire failure.

    When in doubt about your tires, stop by your local reputable tire dealer and inquire at the desk. They will be happy to check your tires and tire pressure.

    NEVER inflate a tire beyond its maximum rating!

    NEVER drive a tire that is severely over- or under-inflated, or it may fail and blow out!

    ALWAYS have your tires installed by a trained and certified tire professional.
     
  25. Howard

    Howard Lifer

    Joined:
    Oct 14, 1999
    Messages:
    47,963
    Likes Received:
    1
    Uh?