On Mon, 14 Jul 2008 17:07:06 +0100, Peter Hill
nospam.demon.co.uk> wrote:
>On Mon, 14 Jul 2008 06:08:32 -0700 (PDT), allan tracy
>
hotmail.com> wrote:
>>>
>>Call me biased but I think the trains were the stars of the show last
>>night.
>>
>>Very entertaining as ever, though ‘we like to keep these things
>>(races) as close as possibleÂ’ did amount to sending May and Hammond on
>>the train via Kyoto. ThatÂ’s a bit like racing from Aberystwyth to
>>London with the train passengers having to go via Edinburgh.
>
>There is no more direct rail route. They may have tunneled a M-way
>though those mountains but have yet to work out how to tunnel for a
>train. Trains need a flatter straighter route that would need 100's of
>miles of tunnel in an earthquake zone making the Channel Tunnel look
>like a breeze. Crossing the mountain backbone of Japan is quite an
>extreme short haul plane trip, to operate with the required climb rate
>the engines have a special rating just for ANA to do it.
>
>>May was impressed by the trains (heÂ’s a bit of crank on the quiet
>>apparently) whilst Clarkson acted the pratt brilliantly, as usual –
>>the Bill Oddy face mask was priceless.
>>
>>Nice car as well but really, car and gearbox have to be a matching
>>pair???
>>
>>More of this please.
>
>ditto.
>
>As for Nitrogen in the tyres. More stable than air? BULLSHIT!!
>(Well so long as the garage air line has a properly serviced and
>functioning dryer on it)
Bridgestone claim N2 holds pressure 6x times longer than dry air.
http://tirenitrogen.typepad.com/tirenitrogen/files/BridgestoneReprint.pdf
"It might take six months to lose 2 psi with nitrogen, compared to
just a month with air."
That would mean N2 is over 23 times less leaky than O2.
air leak / N2 leak = 6 = (0.78 N2leak + 0.22 O2leak) / N2leak
6 N2leak = 0.78 N2leak + 0.22 O2leak
5.22 N2leak = 0.22 O2leak
O2leak / N2leak = 23.7
(can you smell the brown sticky stuff?)
Goodyear (Dunlop, Kelly) say use it but you still have to CHECK THE
PRESSURE!!!
http://tirenitrogen.typepad.com/tirenitrogen/files/goodyear_n2_inflation.pdf
Others say butyl rubber inner liner is an "impermeable, air-tight
membrane".
http://www.indiacar.com/infobank/tlt_const.htm
It was for 40 years but it isn't anymore.
It's not O2 in air that's the problem, it's the 1950's technology of
the leaky Butyl liner. It's time for the tyre makers to replace the
defective leaky liner material in their product with something that
does the job (instead of telling lies).
--
Peter Hill
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Can of worms - what every fisherman wants.
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