Nitrogen tyre fill, hidden charges.

molerat

At work we always used 100% nitrogen in the tyres .........but the 2 tyres were inflated to 350 psi carrying 15 tons hitting the ground at 150 mph

arcon5

What did they say when you refused to pay or queried it then?

DoaM

Joe_Horner wrote: »

But a fixed volume of gas will raise its pressure on heating by the same amount, regardless of what gas it is, so the pressure change in a nitrogen filled tyre as it heats up will be the same as one filled with (dry) air, or oxygen, or hydrogen.

I'm not sure that's technically true, as different materials have differing thermal coefficients of expansion. In reality though, the temperature variation experienced by an automotive tyre on a family vehicle would make any coefficient differences negligible. As such promoting nitrogen-filled tyres is just automotive snake oil.

maninthestreet

Bollotom wrote: »

...And if your passengers start speaking in a weird way, you have a leak :cool:

That's helium that does that.

BeenThroughItAll

maninthestreet wrote: »

That's helium that does that.

I believe there is an urban myth that breathing nitrogen will make your voice deeper.

Theoretically I think a heavier-than-air gas might make your voice get deeper, but you could end up with your lungs half full of it. Nitrogen, however, is marginally lighter than air (although heavier than pure oxygen).

Might have to stand on your head after trying it if you decide to have a go with a heavier-than-air gas.

forgotmyname

Yes, fill up with helium instead, it will reduce the cars unsprung weight and improve the handling as well as making the car lighter and more fuel efficient.

Win win all around. shhh. dont tell KF they will charge you £20 to fill your tyres with helium.

adouglasmhor

BeenThroughItAll wrote: »

I believe there is an urban myth that breathing nitrogen will make your voice deeper.

Theoretically I think a heavier-than-air gas might make your voice get deeper, but you could end up with your lungs half full of it. Nitrogen, however, is marginally lighter than air (although heavier than pure oxygen).

Might have to stand on your head after trying it if you decide to have a go with a heavier-than-air gas.

I wouldn't TBH
http://www.google.com/url?url=http://www.youtube.com/watch%3Fv%3Df2ItJe2Incs&rct=j&frm=1&q=&esrc=s&sa=U&ei=kertVPynJILjaJqIgpAE&ved=0CCwQtwIwAw&sig2=XHqRSAxbECdZvBRq2HVpww&usg=AFQjCNF-iNFVjNspy5UXj9AkCy0KDcvInw

BeenThroughItAll

adouglasmhor wrote: »

I wouldn't TBH
http://www.google.com/url?url=http://www.youtube.com/watch%3Fv%3Df2ItJe2Incs&rct=j&frm=1&q=&esrc=s&sa=U&ei=kertVPynJILjaJqIgpAE&ved=0CCwQtwIwAw&sig2=XHqRSAxbECdZvBRq2HVpww&usg=AFQjCNF-iNFVjNspy5UXj9AkCy0KDcvInw

Hence the word 'theoretically' and tongue-in-cheek reference to standing on one's head

londonTiger

lol, nitrogen probably offsets the weight put on by the valve stem cap

Aretnap

Joe_Horner wrote: »

But a fixed volume of gas will raise its pressure on heating by the same amount, regardless of what gas it is, so the pressure change in a nitrogen filled tyre as it heats up will be the same as one filled with (dry) air, or oxygen, or hydrogen.

Pedantically that's only strictly true of ideal gases, of which there are none. Practically of course oxygen and nitrogen do behave pretty much like ideal gases at normal-ish temperatures and pressures, so any differences in the pressure change as they heat up will be negligible for most purposes.