I have to agree here with Edwin. At least in my area, you can't find a
shop that doesn't use an impact wrench to put the lugs back on. And I am
talking all the way from the "best" tire store, right down to Costco. The
last time I had tires done for me (I usually do them myself at work now if
the auto shop guy gives me permission) I had to demand a torque wrench be
used. I think they only agreed because the prior visit to them resulted in
two broken studs on one of my Elantra's. One of the mechanics had to drive
across the street to Sears to BUY a torque wrench. Can you believe they
didn't even HAVE one! The even funnier thing is that I went with a friend
recently to Sam's Club (like Costco) and while I was waiting for him to
shop, I was watching the tire installation department....they were actually
using a torque wrench...go figure.
Oh, I wasn't laughing at the time, but it is hillarious now. How does
someone call themself an auto mechanic and not even own a torque wrench!!??
I have 3 of them myself and wouldn't even call myself a mechanic. Although
I pretty much do swing wrenches all day at work, but it sure isn't on
automobiles. If I didn't use a torque wrench, I would void the warranty on
most of the equipment here at work. And believe me, when I have to call a
manufacturer for service, that is usually the first thing the tech will
Sad, but true. I rotate my own tires partially so that I can ensure
they are torqued correctly. The other reason is that it gives me a good
chance to inspect the brakes, suspension, etc., when I have the car off
the ground and the wheels off.
And what if I didn't even bought my tires there? My tires doesn't come from
Costco, and they charged me a big 0$ So the price of their tires doesn't
affect me. I never bought tires from them, and I think never will.
I like your logic and use much the same logic. I tend to run my tires
at 35 psi and check them every month or two. I rarely lose more than a
pound a month and that just isn't consequential. And the more times I
add air to my tires, the more pure the nitrogen inside is getting as the
oxygen "leaks" out!
False. As you add new air, you add 21% of oxygen and 1% of other gases, wich
I don't know what gas it is. So when you add air to you tires, you
contaminate the Nitrogen in it. That's my logic. So you wil always have 78%
If you start out with 78% nitrogen, leak out some oxygen, then replace say,
5% of the total volume with air, the nitrogen is still increasing, albeit by
a smaller amount than adding pure nitrogen. Only 20% of the 5% is oxygen
wile 78% of the 5% is nitrogen.
You need to study your physics. If you start out with 80% nitrogen and
20% oxygen (rounding to simply the numbers) and all of the oxygen leaks
out, you have now 100% nitrogen, but your pressure is down by about 20%.
If I now add air to bring the pressure back up to where I started, I
have 80% nitrogen, plus 80% of the 20% air that I just added is
nitrogen, so I now have 96% nitrogen and 4% oxygen am at my normal
pressure again. If all of the oxygen leaks out again, I'm not down only
4% in pressure. So, I add enough air to bring me back to normal
pressure. I now have 96% nitrogen, plus 80% of the 4% air that I added,
which gives me 99.2% nitrogen. I will asymptotically approach 100%
nitrogen, however, even after one cycle I have as pure a nitrogen fill
as the Ford article claims was adequate.
Well, I have going on eight years of college, six of that in
engineering. What is your experience with physics? I'd like to see
your explanation as to why you think adding air won't increase the
nitrogen fraction if the oxygen is continually leaking out.
I've been a tire engineer for 15 years. N2 won't hurt anything but I
wouldn't pay an exrta dime for it. If you go that route you still
need to check your tire pressures regularly. In theory, N2 does
permeate a tire's innerliner slightly more slowly than normal air, but
if you pick up a nail or are leaking at the rim or valve it won't help
a bit. Checking your tire pressure is also your best chance to notice
irregular treadwear patterns before it's too late and to spot any
potentially dangerous tire damage (like a bulge) before your tire
falls apart at 70 MPH.
N2 is not drier than dry air. Any decent tire shop you go to will be
using dry air (to protect their air tools if nothing else).
Getnitrogen is a sales group for nitrogen, it shouldn't surprize
anyone that they support its use.
Why not Carbon Dioxide? What's it's molecular size, and how does it behave
with regard to volume / temperature? According to Michelin's web site, Air,
Nitrogen, and Carbon Dioxide are allowed for inflation purposes.
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