Stupid things non petrolheads say....
Discussion
iva cosworth said:
The Narrator on "Police Interceptors" who just said.
"This Transit is 51% overweight"
It's a Mercedes Sprinter.
Whoever wrote the script obviously not a vanfan.
Meh. 'Transit' is almost a generic, like 'Hoover' or 'Portakabin' (although Portakabin hate the use of their name as a generic)."This Transit is 51% overweight"
It's a Mercedes Sprinter.
Whoever wrote the script obviously not a vanfan.
Flibble said:
CO2 is a larger molecule than N2. However as approximately 0.04% of the air is CO2 that's not a big issue. O2 is the other main component of air (aside from N2) and it is indeed slightly smaller than N2, but the difference is fairly minor in practice.
Likewise the pressure variance difference between O2 and N2 is not worth worrying about in practical terms, the only thing that really makes a difference is how much moisture is in the tyre. Dried air or nitrogen will give a more consistent fill pressure than normal ambient air due to lower water content. Whether you can actually tell the difference on a road car I'm not sure.
As I understand it the whole nitrogen filling thing is a handy money making scheme based on the fact that F1 teams use nitrogen rather than any real difference in performance. Apparently F1 teams use it because they have compressed nitrogen anyway (for the air wrenches) so it simplifies things.
F1 use a lot of different gasses, for example, in 2007 part of the Ferrari/McLaren scandal was over the use of CO2 by Ferrari...Likewise the pressure variance difference between O2 and N2 is not worth worrying about in practical terms, the only thing that really makes a difference is how much moisture is in the tyre. Dried air or nitrogen will give a more consistent fill pressure than normal ambient air due to lower water content. Whether you can actually tell the difference on a road car I'm not sure.
As I understand it the whole nitrogen filling thing is a handy money making scheme based on the fact that F1 teams use nitrogen rather than any real difference in performance. Apparently F1 teams use it because they have compressed nitrogen anyway (for the air wrenches) so it simplifies things.
reason to use N2 is as said, down to eradicating H2O, as this will cause significant changes in pressure as the temps change, which for a car that's extremely sensitive to tyre pressures is somewhat fundamental.
Lot of trucking co's run N2 as it's been shown to improve tyre life on their fleets.
Flibble said:
As I understand it the whole nitrogen filling thing is a handy money making scheme based on the fact that F1 teams use nitrogen rather than any real difference in performance. Apparently F1 teams use it because they have compressed nitrogen anyway (for the air wrenches) so it simplifies things.
Na, F1 teams used gasified gold because its expensive.xRIEx said:
Flibble said:
Apparently F1 teams use it because they have compressed nitrogen anyway (for the air wrenches) so it simplifies things.
Why do they use nitrogen for the wrenches instead of just compressed air? 
In fire extinguishers, Nitrogen is preferred to CO2 for charging dry powder units because it's simply easier and cheaper to store and use than CO2 which, as a gas, reaches higher pressures, so needs heavier cylinders to contain it, or requires refrigeration to keep it liquified. Nitrogen is useful in it's gaseous state at lower pressures than CO2, meaning thinner cylinder walls and so there's less wasted weight in the logistics chain to supply it.
scarble said:
Or they might just do like everyone else and add oil to the air that goes in their tools.
If their tools were going to rust from ambient moisture, wouldn't the moisture in the air outside the tool also cause it to rust?
F1 - nothing gets added unless a sponsor pays for it.If their tools were going to rust from ambient moisture, wouldn't the moisture in the air outside the tool also cause it to rust?
Dracoro said:
GroundEffect said:
Halmyre said:
Dracoro said:
Same power surely.... But I bet it weighs a lot, the auto box sapping power etc.
That's got me wondering, do automatic transmissions still sap power the way they used to?Gearboxes have improved on a lot of cars, however not convinced a Chevy Cruse is particularly aheadwith the game in this respect.
xRIEx said:
Why do they use nitrogen for the wrenches instead of just compressed air?
They don't want to run compressors (which break down) so they run nitrogen from tanks. I guess they could use tanks of air, but excluding oxygen has nice safety implications (no fires) and is probably not much different in cost.yellowjack said:
Dry gas (Nitrogen) means that there is no condensation hanging around inside the tools to cause corrosion when they are out of use, packed for travel between races? I'm no expert, that's just an educated guess, BTW
In fire extinguishers, Nitrogen is preferred to CO2 for charging dry powder units because it's simply easier and cheaper to store and use than CO2 which, as a gas, reaches higher pressures, so needs heavier cylinders to contain it, or requires refrigeration to keep it liquified. Nitrogen is useful in it's gaseous state at lower pressures than CO2, meaning thinner cylinder walls and so there's less wasted weight in the logistics chain to supply it.
You have this back to front; CO2 can be readily stored as a liquid at room temp whereas nitrogen needs low temperatures or very heavy pressure vessels.In fire extinguishers, Nitrogen is preferred to CO2 for charging dry powder units because it's simply easier and cheaper to store and use than CO2 which, as a gas, reaches higher pressures, so needs heavier cylinders to contain it, or requires refrigeration to keep it liquified. Nitrogen is useful in it's gaseous state at lower pressures than CO2, meaning thinner cylinder walls and so there's less wasted weight in the logistics chain to supply it.
Rovinghawk said:
hidetheelephants said:
CO2 can be readily stored as a liquid at room temp .
My understanding is that there's no such thing as liquid CO2- it goes straight from gas to solid.I did not know that, that's my new thing learned for today.
It seems to be liquid at room temperature above about 100 bar.
Blown2CV said:
Fundamentally, someone paying through the nose for pure nitrogen in their tyres without understanding why, or even if it makes a difference, they're a dick.
Come again?N2 costs bugger all, big bottles are something like £30 a pop, and you can fill a s
t load of tyres with one bottle.An yes, it does make a difference.
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