Nitrogen doesn't change temperature as much as Oxygen, hence the pressures don't change. It isn't a case of comparing pressure differences here, its more a case of the difference between temperatures of the gas.
As far as road tyres go, pretty much what Pollymay said. You won't notice any difference at all.
morrisman1,
Jun 26, 6:18pm
I think it would be safe to say that the moisture content of those was pretty high. perhaps had a solid content too
movnon,
Jun 26, 7:35pm
Its the warm wet ones that could be your problem! lol(especially if they feel heavy too)
crusader3,
Jun 26, 8:21pm
Hi All this has made interesting reading for me, 2007 Mondeo s/wagon had two new front tyres fitted six weeks ago and i remarked to the tyre fitter at the time that tyres were full of nitrogen and his reply was" air is just as good' so he filled them with air. Since then I can only get 400Ks to a tankfull of fuel ware as before I always got 460Ks doing the same running. Could this be anadvantage of Nitrogen filled tyres.Just wondering.Regards
johnf_456,
Jun 26, 8:25pm
No way. Many factors influence fuel use, colder weather would be a starting point. It takes longer for the vehicle to warm up therefore it has a richer fuel mix (like a choke on old carbys). Tyre pressure may of changed, binding brakes, blocked airfilter etc.
morrisman1,
Jun 26, 8:27pm
haha, absolutely not. Perhaps your new tyres have a higher rolling resistance or they have been filled to a pressure which is too low. The claimed milage advantage of nitrogen is that there is less seepage of pressure, so your tyres will stay at recommended pressure for longer. I think thats bollocks anyway, I've never had tyre pressure seepage, its always been due to something actually causing a leak.
I like to overinflate my tyres anyway, 36-38 psi all around on 185/60r14 tyres, 1000kg car. Helps a bit with open road economy but not much around town.
tonyrockyhorror,
Jun 26, 8:31pm
May HAVE not "may of".
But I'm intrigued as to how changing tyre pressure would cause brakes to bind.
morrisman1,
Jun 26, 8:34pm
tyre pressure so high that it has caused the rim to bulge inwards contacting the caliper. OBVIOUSLY, dur
johnf_456,
Jun 26, 8:35pm
I was listing items that can change fuel economy, hence the comma after each item. As for grammar both is okay.
tonyrockyhorror,
Jun 26, 8:37pm
No. What you wrote is 100% WRONG. Always.
johnf_456,
Jun 26, 8:38pm
Well that is what you think, listing items with a comma after each one is perfectly fine.
tonyrockyhorror,
Jun 26, 8:38pm
When listing just two possibilities you use and/or, not a comma.
tonyrockyhorror,
Jun 26, 8:39pm
Only if there are three or more.
johnf_456,
Jun 26, 8:40pm
That is your opinion, this is motoring not a spelling competition to nit pick after a long day biker. Just like you use "I'm", which would be better to say "I am" to be more formal.
mm12345,
Jun 26, 8:45pm
Just very roughly, air weighs about a gram a litre, a tyre is probably about 10 litres, but pressure is say about 2 bar, so about 30g of air.Helium weighs about 1/4 that of air, so maybe you could save over 20g per tyre filling them up with helium.Some people have probably gone to greater extremes - for less weight saving.
johnf_456,
Jun 26, 8:46pm
Okay then 2 sets of rules.
nightboss,
Jun 26, 10:52pm
Actually johnf there are three sets of grammatical rules. "Formal", "informal" and "too dumb to care". As you appear to have mastered the third set, it may be time to work on the other two.
un_known,
Jun 26, 11:11pm
nevermind the air vs nitrogen debate.
What i wanna know is what happens if u pump an oxy/acetylene mix in and go drop a skid.Now that could make burnout comps a little more exciting.
craigsmith,
Jun 26, 11:12pm
STFU and go back to school johnf.
solarboy,
Jun 26, 11:53pm
There are three so he's correct. You smoking bad sh!t again !
shadowzz,
Jun 27, 1:37am
The oxygen oxidises the rubber and that's why some tyres look perished on the inside as well as the out side which is exposed to sun and oxygen.
morrisman1,
Jun 27, 6:57am
Tyres I've been around have always looked primo on the inside, even when the outside was good as fugged
movnon,
Jun 27, 8:24am
So air is about 80% nitrogen, 19% oxygen, 1% uda stuff, as long as air goes in as dry as possible (most commercial compressors have moisture traps) every thing should be A OK as long as tyre pressures are correct.
shadowzz,
Jun 27, 5:19pm
Well I thought so too but recently looking at 5 year old tyres aged [cracked] on the inside and outside. I have some 30 year old tyres with no age cracks. I've split open the hose on my gas welder and the oxygen hose has similar cracks but the acetylene has not. My trailer tyres have aged on the inside and out side, even the tyre that never sees the sun.
nightboss,
Jun 27, 6:27pm
First set of tyres on my car lasted 88,000km with air in, second set of exactly same tyres have lasted 86,000km so far with nitrogen in. Wear is no different, life no different, fuel usage is no different, only difference I have seen is they have nice green dust caps.
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